Full Report
Multiple vulnerabilities have been discovered in Citrix products, the most severe of which could allow disclosure of sensitive data. Citrix ADC performs application-specific traffic analysis to intelligently distribute, optimize, and secure Layer 4 - Layer 7 network traffic for web applications. Successful exploitation of the most severe of these vulnerabilities could allow for memory overread, leading to disclosure of potentially sensitive information such as authenticated session tokens. Depending on the sensitive information retrieved via this technique, the attacker may gain further access to the appliance or systems.
Analysis Summary
# Vulnerability: Multiple Flaws in Citrix ADC/Gateway, including Memory Overread Leading to Data Disclosure
## CVE Details
- CVE ID: CVE-2025-5777 (Most Severe), CVE-2025-5349 (Lower Severity)
- CVSS Score: Not explicitly provided, but severity is implied to be high due to sensitive data disclosure (session tokens).
- CWE: Implied CWEs include CWE-125 (Out-of-bounds Read - for CVE-2025-5777) and access control weaknesses (for CVE-2025-5349).
## Affected Systems
- Products: NetScaler ADC and NetScaler Gateway
- Versions:
- NetScaler ADC and NetScaler Gateway 14.1 **BEFORE** 14.1-43.56
- NetScaler ADC and NetScaler Gateway 13.1 **BEFORE** 13.1-58.32
- NetScaler ADC 13.1-FIPS and **NDcPP BEFORE** 13.1-37.235-FIPS and NDcPP
- NetScaler ADC 12.1-FIPS **BEFORE** 12.1-55.328-FIPS
- Configurations:
- **CVE-2025-5777 (Memory Overread):** Affects systems configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server.
- **CVE-2025-5349 (Improper Access Control):** Affects systems where the attacker has access to the NSIP (NetScaler IP for management), Cluster Management IP, or local GSLB Site IP.
## Vulnerability Description
The most critical vulnerability (CVE-2025-5777) is an **out-of-bounds read vulnerability** in NetScaler ADC and Gateway, stemming from insufficient input validation. Successful exploitation allows a remote, unauthenticated threat actor to trigger memory overreads on the affected interface. This memory overread can lead to the **disclosure of potentially sensitive information, such as authenticated session tokens**, potentially granting the attacker further access to the appliance or connected systems.
A secondary, lower-severity vulnerability (CVE-2025-5349) involves improper access control within the NetScaler Management Interface, allowing access to restricted management functions if the attacker has specific management IP exposure.
## Exploitation
- Status: There are currently **no reports of the vulnerabilities being exploited**.
- Complexity: The primary vulnerability seems exploitable by a remote, **unauthenticated** actor, suggesting **Low to Medium** complexity due to the critical disclosure impact.
- Attack Vector: Network (for CVE-2025-5777, targeting VPN/Gateway functions).
## Impact
- Confidentiality: **High** (Disclosure of sensitive information like authenticated session tokens).
- Integrity: **Potential High** (Gaining further access to the appliance/systems based on retrieved data).
- Availability: **Not explicitly detailed**, but typically medium for information disclosure flaws unless the overread causes system instability.
## Remediation
### Patches
Apply the stable channel updates provided by Citrix immediately after appropriate testing. Specific fixed versions mentioned in the advisory include:
- NetScaler ADC and NetScaler Gateway **14.1-43.56 and later**
- NetScaler ADC and NetScaler Gateway **13.1-58.32 and later** (for standard branches)
- NetScaler ADC 13.1-FIPS and NDcPP **13.1-37.235-FIPS and NDcPP and later**
- NetScaler ADC 12.1-FIPS **12.1-55.328-FIPS and later**
### Workarounds
No specific workarounds were detailed in the provided summary, though implied mitigation involves restricting management interfaces or disabling susceptible services if patching is delayed and applicable.
## Detection
- Indicators of Compromise: Successful exploitation results in the disclosure of sensitive memory contents or session tokens being transmitted out of band.
- Detection methods and tools: Deploy/update host-based intrusion detection or prevention solutions (HIDS/HIPS/EDR) and monitor network traffic for irregular memory access patterns associated with the targeted components.
## References
- CVE-2025-5349: hxxps://cve[.]mitre[.]org/cgi-bin/cvename[.]cgi?name=CVE-2025-5349
- CVE-2025-5777: hxxps://cve[.]mitre[.]org/cgi-bin/cvename[.]cgi?name=CVE-2025-5777
- Citrix Advisory: hxxps://support[.]citrix[.]com/support-home/kbsearch/article?articleNumber=CTX693420