Threat Intelligence / CVE / CVE-2025-5777
CVE-2025-5777
CISA KEVRansomwareAs of 2025-10-30, CVE-2025-5777 is a CVSS 7.5 (HIGH-severity) vulnerability. CISA KEV-listed (known exploited). EPSS exploitation probability 62.3%. Threadlinqs Intelligence tracks 5 threats exploiting it.
Last updated: 2025-10-30
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
CVSS v3 vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weaknesses (CWE)
CWE-125, CWE-908, CWE-457
Exploitation status
CISA KEV-listed (known exploited)
Threats tracking this CVE
- Anubis Ransomware Group Confirms Data Theft in Coca-Cola Fairlife Attack Tied to CitrixBleed 2 (CVE-2025-5777) Exploitation Wave — CRITICAL
- CitrixBleed 2 (CVE-2025-5777) Weaponized by Initial Access Broker for DragonForce Ransomware Deployment — CRITICAL
- Ransomware Groups Exploit Citrix Bleed 2 (CVE-2025-5777) and Kontron Driver BYOVD for Access and Privilege Escalation — CRITICAL
- CitrixBleed-Class NetScaler ADC/Gateway SAML AuthnRequest Memory Disclosure (CVE-2026-8451) Exploited Within 24 Hours of Disclosure — CRITICAL
- Citrix NetScaler Mass Reconnaissance Campaign via Residential Proxies — HIGH
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
Full detection coverage & IOCs for threats exploiting CVE-2025-5777 are available via the Threadlinqs MCP server (Purple tier). View plans →
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Enriched from CVE.org, NVD (this product uses the NVD API but is not endorsed or certified by the NVD), FIRST EPSS, CISA KEV, and GitHub Security Advisories.