CVE-2025-5777
high CISA KEVCitrix NetScaler ADC and Gateway Out-of-Bounds Read Vulnerability
Vendor / product: Citrix — NetScaler ADC and Gateway
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
7.5
7.5 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2025-06-17 13:15
Modified: 2026-10-08 10:35
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Listed in CISA KEV
Added 2025-07-10 · due 2025-07-11
Known ransomware use: Known
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
citrix / netscaler_application_delivery_controller ≥12.1 <12.1-55.328, ≥13.1 <13.1-37.235, ≥13.1 <13.1-58.32, ≥14.1 <14.1-43.56
citrix / netscaler_gateway ≥13.1 <13.1-58.32, ≥14.1 <14.1-43.56
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 secure@citrix.com
- https://citrixbleed.com af854a3a-2127-422b-91ae-364da2661108
- https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-mayb... af854a3a-2127-422b-91ae-364da2661108
- https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-... af854a3a-2127-422b-91ae-364da2661108
- https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives... af854a3a-2127-422b-91ae-364da2661108
- https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-... af854a3a-2127-422b-91ae-364da2661108
- https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/ af854a3a-2127-422b-91ae-364da2661108
- https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f31063... 134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc... 134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777 134c704f-9b21-4f2e-91b3-4a467353bcc0
Data sources
CISA KEV — fetched 2026-10-27 06:50 UTC · record ↗
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗