CVE-2025-5777
NetScaler ADC, NetScaler Gateway
Published 17 Jun 2025 · updated 4 Aug 2026 · Analyzed
9.3 Critical · CVSS 4.0, citrix.com
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 10 Jul 2025, with a remediation deadline of 11 Jul 2025 for US federal agencies. It has been used in ransomware campaigns.
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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
- support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 · Vendor Advisory
- citrixbleed.com/ · Broken Link, Third Party Advisory
- horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/ · Third Party Advisory
- labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/ · Third Party Advisory
- www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/ · Press/Media Coverage, Third Party Advisory
- www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/ · Third Party Advisory
- www.theregister.com/2025/07/10/cisa_citrixbleed_kev/ · Press/Media Coverage
- doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71 · Third Party Advisory
- reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/ · Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777 · US Government Resource