CVE-2025-5777

Known Exploited
NetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overread

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

Categories

9.3
CVSS
Severity: Critical
CVSS 4.0 •
CVSS 3.1 •
EPSS 0.04%
KEV Since 
Vendor Advisory citrix.com
Affected: NetScaler ADC
Affected: NetScaler Gateway
Published at:
Updated at:

References

Link Tags
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX693420 vendor advisory
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 third party advisory
https://reliaquest.com/blog/threat-spotlight-citrix-bleed-2-vulnerability-in-netscaler-adc-gateway-devices/

Frequently Asked Questions

What is the severity of CVE-2025-5777?
CVE-2025-5777 has been scored as a critical severity vulnerability.
How to fix CVE-2025-5777?
To fix CVE-2025-5777, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-5777 being actively exploited in the wild?
It is confirmed that CVE-2025-5777 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-5777?
CVE-2025-5777 affects NetScaler ADC, NetScaler Gateway.
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