CVE-2025-6543

critical

Description

Memory overflow vulnerability leading to unintended control flow and Denial of Service in NetScaler ADC and NetScaler Gateway when configured as Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) OR AAA virtual server

References

Exploits
More

https://www.securityweek.com/critical-citrix-netscaler-flaw-exploited-as-zero-day/

https://www.theregister.com/2025/06/25/citrix_netscaler_critical_bug_exploited/

https://www.bleepingcomputer.com/news/security/citrix-warns-of-netscaler-vulnerability-exploited-in-dos-attacks/

https://thehackernews.com/2025/06/citrix-releases-emergency-patches-for.html

https://cyberscoop.com/citrix-zero-day-netscaler/

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788

Details

Source: Mitre, NVD

Published: 2025-06-25

Updated: 2025-06-26

Named Vulnerability: Citrix Bleed 2

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

CVSS v4

Base Score: 9.2

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L

Severity: Critical

EPSS

EPSS: 0.00057

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest

Detections

Analytics