Full Report
Shortly after the disclosure of two Sudo-related local privilege escalation vulnerabilities affecting major Linux distributions, attention has shifted to a critical security issue in NetScaler ADC, which has already been exploited in the wild. The vulnerability tracked as CVE-2025-5777 is characterized as a memory overflow issue that may lead to unexpected control flow and potential […] The post CVE-2025-5777 Detection: A New Critical Vulnerability Dubbed “CitrixBleed 2” in NetScaler ADC Faces Exploitation Risk appeared first on SOC Prime.
Analysis Summary
# Vulnerability: Critical Vulnerability in NetScaler ADC (CitrixBleed 2)
## CVE Details
- CVE ID: CVE-2025-5777
- CVSS Score: Critical (Score not explicitly provided, but context implies high severity/critical)
- CWE: [Not available in context]
## Affected Systems
- Products: NetScaler ADC and NetScaler Gateway
- Versions: Vulnerable versions are not explicitly listed, but are implied to be prior to the fixed versions mentioned in the vendor advisory.
- Configurations: Devices exposed online are at risk.
## Vulnerability Description
This vulnerability, dubbed "CitrixBleed 2," affects NetScaler ADC and NetScaler Gateway. While the specific technical nature is not detailed in the provided snippet, the context suggests it is critical and carries a high risk of exploitation, similar to prior high-profile Citrix vulnerabilities.
## Exploitation
- Status: Faces exploitation risk; security community expects active abuse soon.
- Complexity: [Not explicitly stated, but high risk implies potential low/medium complexity]
- Attack Vector: [Implied Network accessibility, as devices are exposed online]
## Impact
- Confidentiality: [Not explicitly stated]
- Integrity: [Not explicitly stated]
- Availability: [Not explicitly stated]
## Remediation
### Patches
- **Upgrade:** Users must upgrade to supported fixed versions as advised by the vendor (referencing vendor advisory for specific affected/fixed versions: CTX693420).
### Workarounds
- **Terminate Sessions:** After updating all NetScaler appliances in a high-availability pair or cluster, execute specific commands to terminate all active ICA and PCoIP sessions. This forces closure of potentially compromised pre-patch sessions.
## Detection
- **Indicators of Compromise:** Not explicitly detailed, but detection efforts should focus on anomalous network activity targeting NetScaler endpoints.
- **Detection Methods and Tools:** Utilize security tools and threat intelligence platforms (e.g., those offered by SOC Prime) to deploy detection rules for this specific threat.
## References
- Vendor Advisory Reference (Implied): CTX693420
- Relevant Links:
- Censys Data: hXXps://censys.com/advisory/cve-2025-5777-cve-2025-6543-cve-2025-5439
- Vendor Advisory Link (Defanged): hXXps://www.citrix.com/en-us/security/advisory/ctx693420-articleNumber=CTX693420&articleTitle=NetScaler_ADC_and_NetScaler_Gateway_Security_Bulletin_for_CVE_2025_5349_and_CVE_2025_5777