CVE-2025-5777NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread
Updated under an hour ago ()
Does this affect you?
It affects NetScaler ADC and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Jul 10, 2025; federal agencies had to remediate by Jul 11, 2025, and it is known to be used in ransomware. Treat that date as your deadline.
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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
- 9.3 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
- Weakness (CWE)
- CWE-125
- Known exploited
- Added to CISA KEV Jul 10, 2025; federal remediation due Jul 11, 2025; known ransomware useApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 99.97% (percentile 100)
- Assigned by
- Citrix
- NVD analysis
- Analyzed
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
NetScaler ADC netscaler:adc (from the name) | from 14.1 before 43.56; from 13.1 before 58.32 | CNA record |
NetScaler Gateway netscaler:gateway (from the name) | from 14.1 before 43.56; from 13.1 before 58.32 | CNA record |
citrix netscaler_application_delivery_controller citrix:netscaler_application_delivery_controller | from 12.1 before 12.1-55.328; from 13.1 before 13.1-37.235; from 13.1 before 13.1-37.235; from 13.1 before 13.1-58.32; from 14.1 before 14.1-43.56 | NVD |
citrix netscaler_gateway citrix:netscaler_gateway | from 13.1 before 13.1-58.32; from 14.1 before 14.1-43.56 | NVD |
References
- https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420vendor-advisory
- https://citrixbleed.combroken-link, third-party-advisory
- https://horizon3.ai/attack-research/attack-blogs/cve-2025-5777-citrixbleed-2-write-up-maybe/third-party-advisory
- https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/third-party-advisory
- https://www.bleepingcomputer.com/news/security/cisa-tags-citrix-bleed-2-as-exploited-gives-agencies-a-day-to-patch/press/media-coverage, third-party-advisory
- https://www.netscaler.com/blog/news/netscaler-critical-security-updates-for-cve-2025-6543-and-cve-2025-5777/third-party-advisory
- https://www.theregister.com/2025/07/10/cisa_citrixbleed_kev/press/media-coverage
- https://doublepulsar.com/citrixbleed-2-exploitation-started-mid-june-how-to-spot-it-f3106392aa71third-party-advisory
- https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/third-party-advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-5777us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.