CVE-2025-5777
KEVCitrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
9.3
CriticalPublished:
Last updated:
Source:secure@citrix.com
Analyzed
Weakness (CWE)
CVSS Vector
v4.0- Attack Vector
- Network
- Attack Complexity
- Low
- Attack Requirements
- None
- Privileges Required
- None
- User Interaction
- None
- Confidentiality (Vulnerable)
- High
- Integrity (Vulnerable)
- High
- Availability (Vulnerable)
- High
- Confidentiality (Subsequent)
- Low
- Integrity (Subsequent)
- Low
- Availability (Subsequent)
- Low
Description
Insufficient input validation leading to memory overread when the NetScaler is configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server
References
af854a3a-2127-422b-91ae-364da2661108
https://citrixbleed.comaf854a3a-2127-422b-91ae-364da2661108
https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/af854a3a-2127-422b-91ae-364da2661108
https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/af854a3a-2127-422b-91ae-364da2661108
https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/af854a3a-2127-422b-91ae-364da2661108
https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/af854a3a-2127-422b-91ae-364da2661108
https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/134c704f-9b21-4f2e-91b3-4a467353bcc0
https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71134c704f-9b21-4f2e-91b3-4a467353bcc0
https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777