Full Report
Vulnerability research company WatchTowr published a detection analysis for the Citrix Blled 2 flaw
Analysis Summary
# Vulnerability: CitrixBleed 2 (CVE-2025-5777)
## CVE Details
- CVE ID: CVE-2025-5777
- CVSS Score: 9.3 (Critical)
- CWE: Out-of-bounds Read (Implied by description)
## Affected Systems
- Products: Citrix NetScaler ADC and Gateway
- Versions: Versions between 14.1 and 47.46 (inclusive of lower bound, exclusive of upper logic implies testing range)
- Configurations: Applicable to NetScaler ADC/Gateway instances.
## Vulnerability Description
The vulnerability, tracked as CVE-2025-5777, is an Out-of-Bounds Read flaw. Successful exploitation allows an attacker to bypass established authentication mechanisms, including Multi-Factor Authentication (MFA), and subsequently hijack active user sessions on the affected devices. This vulnerability was disclosed alongside CVE-2025-5349 (an access control issue).
## Exploitation
- Status: Exploited in the wild (Reported with "medium confidence")
- Complexity: Not explicitly detailed, but given the critical impact (MFA bypass), likely low to medium complexity for initial access.
- Attack Vector: Network (Implied, as this relates to network gateway components)
## Impact
- Confidentiality: High (Session hijacking allows access to potentially sensitive session data)
- Integrity: High (Ability to act as an authenticated user)
- Availability: Not explicitly stated, but session hijacking can disrupt legitimate user access.
## Remediation
### Patches
The article confirms the vulnerability was disclosed on June 17, suggesting vendor patches should be available. Specific patch versions were not listed in the provided text, but users should refer to Citrix advisories for updates to versions 14.1 and 47.46 and later.
### Workarounds
No specific workarounds were detailed in the provided text segment, aside from the general necessity of patching.
## Detection
- Indicators of Compromise (IoCs): WatchTowr researchers published a detection script following initial silence, implying that analyzing traffic patterns or post-exploitation artifacts related to session hijacking or authentication bypass events is necessary.
- Detection Methods and Tools: A detection script has been shared by WatchTowr researchers, focusing on identifying exploitation artifacts. Security teams should actively seek and deploy this analysis method.
## References
- Vendor Advisory: Citrix disclosure on June 17 (Reference: CTX693420)
- ReliaQuest Report: [reliaquest com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/]
- Infosec Article: [infosecurity-magazine com/news/citrixbleed-2-detection-analysis/]