CVE-2025-5777

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

Scoring

• CVSS: 7.5 (HIGH, 3.1)
• EPSS exploitation probability: Not yet available
• EPSS percentile: Not yet available

CISA KEV status

• Added to KEV: 2025-07-10
• Remediation due date: 2025-07-11
• Known ransomware campaign use: Known

Weakness types (CWE)

• CWE-125
• CWE-908

References

• https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420
• https://citrixbleed.com
• https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/
• https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/
• https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/
• https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/
• https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/
• https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71
• https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777

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