CVE-2025-5777

HIGH CISA KEV
Published Jun 17, 2025 Modified Oct 30, 2025 CWE-125 CWE-908 CWE-457

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

CVSS v3.1 Score

7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Jul 10, 2025 Remediation due: Jul 11, 2025 Known ransomware use

Weakness Type (CWE)

CWE-125 Out-of-bounds Read
CWE-908 CWE-908
CWE-457 CWE-457

Affected Products

Vendor Product
citrix netscaler_application_delivery_controller
citrix netscaler_application_delivery_controller
citrix netscaler_application_delivery_controller
citrix netscaler_application_delivery_controller
citrix netscaler_application_delivery_controller
citrix netscaler_gateway
citrix netscaler_gateway

References

Other References

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

Frequently Asked Questions

What is CVE-2025-5777? +
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 It has a CVSS v3.1 base score of 7.5 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.
How severe is CVE-2025-5777? +
CVE-2025-5777 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2025-5777? +
CVE-2025-5777 affects products from citrix, specifically: netscaler_application_delivery_controller, netscaler_gateway. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-5777? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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