Table of Contents:
Technical Details and Impact
Affected Products
Exploitation and Risk
Related Vulnerabilities
Mitigation and Remediation
Broader Security Context
Conclusion
FAQ

CVE-2025-5349: A Serious Flaw in NetScaler ADC and Gateway

Imagine someone gaining unauthorized control over your network simply because of a flaw in your security setup. CVE-2025-5349 is exactly that kind of problem, affecting NetScaler ADC, also Gateway, formerly known as Citrix ADC and Citrix Gateway.

Technical Details and Impact

The central problem with CVE-2025-5349 lies in the NetScaler Management Interface. It does not adequately control who accesses it. If a malicious person gains access to the Network Services IP (NSIP), Cluster Management IP, or a local Global Server Load Balancing (GSLB) Site IP, then they may bypass security checks. With it, they may acquire unauthorized administrative rights on your equipment.

• It allows attackers to bypass authentication.
• They may also bypass privilege restrictions.

NetScaler ADC as well as Gateway provide application delivery, load balancing, as well as secure remote access services. These devices are commonly used in business environments. If these devices are compromised, it may lead to complete management over network traffic. It may also intercept sensitive information, not to mention disrupt critical business applications.

It received a CVSS v4.0 base score of 8.7. This score shows just how serious the vulnerability is.

Affected Products

Many versions of NetScaler ADC along with NetScaler Gateway are vulnerable. All current releases may be affected.

You must verify your product versions against official Citrix advisories. Doing this verifies if they are affected.

Exploitation and Risk

Exploiting CVE-2025-5349 is easy because it does not need prior authentication. The attacker also does not need user interaction. This makes it a remote code execution or privilege escalation hazard. It happens from an attacker who has network access to the administration interface. Nevertheless, the attacker must reach specific IP addresses. Examples are NSIP, Cluster Management IP, or GSLB Site IP. Network setups may limit these addresses. However, some, particularly those without network segmentation, may expose them.

• Attackers do not need authentication.
• User interaction is not needed.

Its Exploit Prediction Scoring System (EPSS) score is around 0.06%. This means that there has been limited exploitation since the discovery. The serious nature of this issue means that vulnerable setups are still at risk.

Related Vulnerabilities

CVE-2025-5349 came out around the same time as CVE-2025-5777. It is a memory overread issue in Gateway services caused by insufficient input validation. CVE-2025-5777 lets attackers access confidential information like credentials and configuration settings. Contrastingly, CVE-2025-5349 is about mismanaged access. It grants administrative access without permission. Both have high CVSS scores (8.7 and 9.3, respectively). Both need quick action.

Mitigation and Remediation

Citrix has issued guidelines recommending immediate action for CVE-2025-5349. Your priority is to update vulnerable NetScaler ADC as well as Gateway instances. Get the fixed versions from Citrix. It fixes how the management interface controls access.

Also, Citrix also advises that you take more actions.

• Control network access to the NetScaler Management Interface. Limit this access to authorized administrators as well as management networks only.
• Set up network segmentation and firewall rules. It should prevent unauthorized entry to NSIP, Cluster Management IP, in addition to GSLB Site IP addresses.
• Look for unusual access. Also, watch logs for attempts to misuse the vulnerability.
• Quickly identify affected instances by performing vulnerability scans. Use Citrix’s security advisory instruments.

Broader Security Context

The discovery of CVE-2025-5349 shows how difficult securing critical network devices is. NetScaler ADC furthermore Gateway are important for numerous businesses. They provide essential services such as load balancing, VPN access, moreover secure remote connectivity. Vulnerabilities may cascade through systems. It can expose internal networks to hackers, not to mention intercept or alter confidential data.

Access control is a core security idea. This vulnerability shows this principle’s importance. Even advanced devices can fail if management interfaces lack protection, especially when open to wider networks.

Conclusion

CVE-2025-5349 is a serious improper access control vulnerability. NetScaler ADC but also Gateway products are affected. An attacker with network access may gain administrative privileges. That presents a considerable risk to enterprise networks. Since it received a CVSS score of 8.7, you should immediately fix it. Get the vendor-provided patches moreover restrict network access. By doing so, you lessen potential exploitation.

FAQ

What is CVE-2025-5349?

It is a security vulnerability in NetScaler ADC in addition to Gateway products that can allow an attacker to gain unauthorized administrative access.

Why is it so serious?

It allows attackers to control network traffic, intercept data, also disrupt business applications.

What should I do?

You must upgrade your NetScaler ADC plus Gateway instances to the newest versions and restrict network access to the management interface.

Resources & References:

1. https://www.secpod.com/blog/critical-flaws-in-netscaler-adc-gateway-cve-2025-5349-and-cve-2025-5777/
2. https://www.cvedetails.com/cve/CVE-2025-5349/
3. https://docs.netscaler.com/en-us/netscaler-console-service/instance-advisory/remediate-vulnerabilities-cve-2025-5349.html
4. https://support.citrix.com/external/article/693420/netscaler-adc-and-netscaler-gateway-secu.html
5. https://www.tenable.com/cve/CVE-2025-5349