Verified User in Outsourcing/Offshoring

Small-Business (50 or fewer emp.)

11/8/2025

"Professional, Reliable, and Insightful Security Partner"

5/5

What do you like best about CyStack Security Services?

What I appreciate most about CyStack Security Services is their professionalism and clarity throughout the entire engagement. Their team communicates complex technical findings in a way that’s easy to understand and directly tied to business impact.

They’re also very responsive — whenever we had questions or needed clarification, they provided quick and detailed answers. The reports are well-structured, prioritizing risks effectively, which made it easier for our development team to take immediate action. Overall, the collaboration felt more like working with a partner than just a service provider. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

There isn’t much to dislike. That said, they were always transparent about timelines and kept us updated throughout the process. Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

I’d recommend CyStack Security Services to any organization that takes security seriously but may not have a full in-house security team. Their approach is thorough, practical, and tailored to each client’s environment — not just a one-size-fits-all checklist.

If you’re looking for a partner who can both identify vulnerabilities and help you understand how to fix them effectively, CyStack is a solid choice. Just make sure to plan the project timeline in advance, especially if you’re engaging them during a busy season, to get the most efficient turnaround. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

CyStack helps us identify and address security vulnerabilities across our systems before they can be exploited. Their vulnerability assessment and penetration testing services gave us clear, actionable insights rather than just technical reports.

As a result, we’ve significantly improved our security posture, reduced potential attack surfaces, and built more confidence in our internal team’s ability to manage threats. It also helped us demonstrate compliance and reassure our partners about our security practices. Review collected by and hosted on G2.com.

Response from Sơn Võ Thành of CyStack Security Services

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Greeting from CyStack.

Reading that you felt like you were working with a partner rather than a service vendor really made our day. That is exactly the kind of relationship we strive to build with our clients.

We know how overwhelming security data can get, so we are glad to hear that our focus on clarity helped your developers cut through the noise. Our goal is always to make sure you don't just see a list of technical problems, but actually understand the business impact as well so you can make the decision more easily.

Thank you for trusting us to help you demonstrate compliance and build confidence with your own partners. We are here to support your team whenever you need us next.

Son T.

Mid-Market (51-1000 emp.)

11/10/2025

"Red Team Service Uncovers Vulnerabilities Effectively"

5/5

What do you like best about CyStack Security Services?

What I like best is the Red Team service, as it simulates real-world hacker attacks, allowing us to identify system vulnerabilities and weaknesses early, and take effective measures to address them. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

I am satisfied with most of the services; however, I think the WhiteHub feature could be further improved to better meet our needs. Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

If your product is in the development stage, I recommend using CyStack’s Red Team or WhiteHub services, as they can help enhance the security of your application. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

The CyStack team has worked closely with us to identify security vulnerabilities early, provide effective remediation recommendations, and help make our product increasingly secure and reliable. Review collected by and hosted on G2.com.

Response from Sơn Võ Thành of CyStack Security Services

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Thanks so much for the review! We are really happy to hear that our Red Team service helped you find those vulnerabilities early, and provided effective measures to support your team to achieve great things with modern cybersecurity.

We also really appreciate your honest feedback regarding WhiteHub. We are working around the clock to refine our tools, so I have passed your comment along to our product team. This will make sure that every part of our service, including WhiteHub, meets your needs perfectly.

Again, thank you for trusting us to help keep your product secure and reliable!

Verified User in Financial Services

Enterprise (> 1000 emp.)

10/22/2025

"GREAT PARTNER for running a bug bounty program!"

5/5

What do you like best about CyStack Security Services?

The team is super supportive and easy to work with. They respond quickly, handle reports professionally, and make sure everything runs smoothly. I also really like that WhiteHub connects us with talented Vietnamese security researchers — it feels like we’re working together with the local security community, not just hiring a vendor Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

Not much to complain about. Maybe the dashboard could be a bit more visual or easier to track long-term stats, but overall the experience has been excellent Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

If you’re looking for a trusted local partner to help you run a bug bounty program or improve your product security, CyStack is a great choice. They know the community, understand what companies need, and really care about the results Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

At Momo, we wanted to strengthen our security testing by working with ethical hackers in Vietnam. CyStack helped us launch and manage our bug bounty program through their WhiteHub platform. Thanks to their support, we’ve been able to find and fix real vulnerabilities that traditional security testing couldn’t catch.

It’s been a great way to improve our overall security and build trust with our users. Review collected by and hosted on G2.com.

Response from CyStack Customer Success of CyStack Security Services

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Thank you for your kind words and trust in CyStack. We’re proud to support Momo in strengthening its product security through collaboration with Vietnam’s ethical hacker community on WhiteHub.

Your feedback on the dashboard is much appreciated. We’re continuously improving to make tracking and visualization even better. It’s been a pleasure working with your team and we look forward to growing this partnership further.

Thái P.

Mid-Market (51-1000 emp.)

2/5/2026

"Incredibly Fast, Professional Support Every Time"

5/5

What do you like best about CyStack Security Services?

Their support team is incredibly fast and professional. They always respond promptly and provide clear, effective solutions. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

Honestly, I don’t have anything significant to dislike. The service has been smooth and consistently reliable. Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

I highly recommend CyStack for their professionalism, clear communication, and reasonable pricing. They provide excellent value for the quality of service. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

Finding hidden vulnerabilities in Systems Review collected by and hosted on G2.com.

Response from Sơn Võ Thành of CyStack Security Services

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Hey Thái,

Thanks for taking the time to tell us about your experience. We're delighted you saw how quickly and clearly our team responded. It's fantastic to hear that you felt our quick, accurate help and forthright communication were important to how we do business.

We also appreciate your confidence in CyStack's methodology of identifying hidden vulnerabilities and providing substantial value. Your input makes us even more determined to create security services that are trustworthy and efficient.

Best wishes to you and your team,

Sơn Võ

Verified User in Information Technology and Services

Small-Business (50 or fewer emp.)

11/7/2025

"Comprehensive Security Made Effortless with CyStack"

4.5/5

What do you like best about CyStack Security Services?

What I like best about CyStack Security Services is how comprehensive yet easy to use their platform is. It combines vulnerability scanning, continuous monitoring, and detailed reporting in one dashboard, so I can see the full security posture of my applications without juggling multiple tools. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

The documentation for API usage and automation would benefit from including more real-world examples, especially for developers aiming to integrate security checks directly into their workflows. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

CyStack’s Vulnerability Scanning tools are designed to identify issues such as those listed in the OWASP Top 10, including SQL injection, cross-site scripting (XSS), broken authentication, and misconfiguration in web applications, APIs, and server IPs. Their Asset Monitoring service continuously keeps an eye on your web applications, sub-domains, APIs, and similar assets for potential exposures, such as open ports, risks of domain or sub-domain takeover, and leaked credentials. Review collected by and hosted on G2.com.

Verified User in Computer Software

Small-Business (50 or fewer emp.)

2/5/2026

"A Reliable Security Partner with Great Customer Support"

5/5

What do you like best about CyStack Security Services?

Great customer service, with clear communication around the cost, scope of work, and timeline.

Their expertise is exceptional. They asked clarifying questions whenever necessary and helped us identify real security issues quickly with actionable guidance so that we could remediate them before the deadline. The final report was well organised and thoroughly documented. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

We really don't have anything to complain about. Review collected by and hosted on G2.com.

Response from Sơn Võ Thành of CyStack Security Services

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Thanks so much for telling us about your experience.

We appreciate your attention to noticing how well we communicated regarding the scope, cost, and dates, along with our technical approach during the engagement.

We're delighted that the penetration testing results and final outcome suited your needs and helped to accomplish your goal. Many thanks for choosing CyStack as your security partner.

Best wishes,

Sơn Võ

Thu Phuong N.

Mid-Market (51-1000 emp.)

10/23/2025

"Transparent, Reliable Testing with Excellent Communication"

4.5/5

What do you like best about CyStack Security Services?

The team demonstrates strong English communication skills, which makes interactions smooth and clear. They provide a platform that allows for sharing real-time test results with clients, ensuring transparency throughout the process. Their testing approach is systematic, and the presence of certified team members adds to the reliability of their services. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

At times, the team misses deadlines and does not consistently follow up with the client regarding the timeline. Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

The team demonstrates strong expertise and follows systematic workflows in line with ISO certification standards. Additionally, they regularly introduce a range of new cyber products which are impressive. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

They perform annual penetration testing on our applications. Review collected by and hosted on G2.com.

Response from CyStack Customer Success of CyStack Security Services

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Thank you for taking the time to share your detailed feedback. We’re glad to hear that our communication, testing transparency, and systematic approach have contributed positively to your experience.

We also appreciate your honest note about scheduling and follow-ups. This is valuable input that we’re actively working to improve through tighter project coordination and more proactive status updates.

Your trust and continued collaboration mean a lot to us. We’re committed to maintaining the highest testing standards while ensuring a smoother experience for all our clients.

Verified User in Computer Software

Small-Business (50 or fewer emp.)

11/5/2025

"Exceptional Hands-On Security with Actionable Insights"

5/5

What do you like best about CyStack Security Services?

What I like best about CyStack Security Services is their hands-on, transparent approach to cybersecurity. They don’t just deliver reports — they actively work with your team to identify root causes, prioritize critical risks, and provide clear, actionable remediation steps. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

What I dislike about CyStack Security Services is that some of their processes still feel a bit manual and communication-heavy, especially during large-scale assessments. While their technical work is solid, the reporting and ticketing workflow could be more automated or better integrated with internal tools like Jira or GitLab. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

CyStack Security addresses the growing challenge of protecting digital assets in an increasingly complex and hostile cyber environment. They focus on proactive security — identifying vulnerabilities before attackers do — through services like penetration testing, security monitoring, and vulnerability assessment. Review collected by and hosted on G2.com.

Response from CyStack Customer Success of CyStack Security Services

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Thank you for the thoughtful review and for recognizing our hands-on and transparent approach to security. We’re glad that our collaboration and actionable recommendations have brought real value to your team.

We also truly appreciate your feedback regarding process automation and integration with tools like Jira and GitLab. That’s an area we’re actively improving to make collaboration even smoother and more efficient in large-scale projects.

Your trust and insights mean a lot to help us keep evolving and deliver an even better experience.

(張志惟) W.

Small-Business (50 or fewer emp.)

10/22/2025

"Good cybersecurity team can help you solve problems more quickly~"

4.5/5

What do you like best about CyStack Security Services?

Highly professional and provided us with solutions to address the issues we encountered. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

I was completely satisfied with this collaboration — there was nothing I didn’t like. Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

Any issues can be brought to their attention, and CyStack will assist in resolving them with great patience. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

The penetration testing service was conducted with the support of the CyStack team. They were highly professional and efficient, clearly identifying the vulnerabilities in our system and assisting us in making improvements. CyStack is a trustworthy cybersecurity partner, and we would gladly work with them again in the future. Review collected by and hosted on G2.com.

Response from CyStack Customer Success of CyStack Security Services

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Thank you for your thoughtful review. We’re glad to hear our penetration testing service helped your team identify and address vulnerabilities effectively. Your trust means a lot to us and we look forward to continuing to support your security journey.

Thang N.

Mid-Market (51-1000 emp.)

11/5/2025

"Exceptional Expertise and Outstanding Team Support"

5/5

What do you like best about CyStack Security Services?

Their expertise and comprehensive approach to every detail, combined with the unwavering support of a skilled and outstanding team, truly stand out. Review collected by and hosted on G2.com.

What do you dislike about CyStack Security Services?

I honestly can't think of anything critical. Review collected by and hosted on G2.com.

Recommendations to others considering CyStack Security Services:

Give them a try—you won't regret it. Review collected by and hosted on G2.com.

What problems is CyStack Security Services solving and how is that benefiting you?

CyStack conducted an IT security assessment for us and offered valuable consultation regarding IT risks. As a result, our systems have been reinforced and are now better protected with updated procedures and additional security layers. Review collected by and hosted on G2.com.

Response from CyStack Customer Success of CyStack Security Services

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Thank you so much for your kind words and for sharing your experience with CyStack! We’re delighted to know that our team’s expertise and dedication made a real difference in strengthening your systems.

Our goal has always been to combine technical excellence with reliable support, so feedback like yours truly motivates us to keep raising the bar.

We really appreciate your trust and recommendation. It means a lot to our entire team.

CyStack Security Services Reviews (22)

CyStack Security Services Reviews (22)

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