CVE-2026-3055

critical

Description

Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread

References

https://thehackernews.com/2026/04/china-linked-storm-1175-exploits-zero.html

https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-actively-exploited-citrix-flaw-by-thursday/

https://therecord.media/cisa-tells-federal-agencies-to-patch-citrix-netscaler-bug

https://securityaffairs.com/190197/security/u-s-cisa-adds-a-flaw-in-citrix-netscaler-to-its-known-exploited-vulnerabilities-catalog.html

https://www.theregister.com/2026/03/30/citrix_netscaler_flaw/

https://www.infosecurity-magazine.com/news/critical-citrix-netscaler/

https://www.cisa.gov/news-events/alerts/2026/03/30/cisa-adds-one-known-exploited-vulnerability-catalog

https://www.bleepingcomputer.com/news/security/critical-citrix-netscaler-memory-flaw-actively-exploited-in-attacks/

https://www.securityweek.com/exploitation-of-fresh-citrix-netscaler-vulnerability-begins/

https://www.databreachtoday.com/under-fire-attackers-target-flaws-in-f5-citrix-gear-a-31289

https://securityaffairs.com/190131/hacking/urgent-alert-netscaler-bug-cve-2026-3055-probed-by-attackers-could-leak-sensitive-data.html

https://thehackernews.com/2026/03/citrix-netscaler-under-active-recon-for.html

https://www.itsecurityguru.org/2026/03/27/critical-citrix-netscaler-flaw-draws-citrixbleed-comparisons-as-exploitation-window-narrows/?utm_source=rss&utm_medium=rss&utm_campaign=critical-citrix-netscaler-flaw-draws-citrixbleed-comparisons-as-exploitation-window-narrows

https://www.hipaajournal.com/urgent-action-required-to-fix-critical-citrix-netscaler-vulnerability/

https://www.bleepingcomputer.com/news/security/citrix-urges-admins-to-patch-netscaler-flaws-as-soon-as-possible/

https://www.securityweek.com/critical-citrix-netscaler-vulnerability-poised-for-exploitation-security-firms-warn/

https://www.infosecurity-magazine.com/news/citrix-patch-netscaler/

https://www.helpnetsecurity.com/2026/03/24/netscaler-adc-gateway-cve-2026-3055/

https://thehackernews.com/2026/03/citrix-urges-patching-critical.html

https://securityaffairs.com/189908/security/citrix-netscaler-critical-flaw-could-leak-data-update-now.html

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055

Details

Source: Mitre, NVD

Published: 2026-03-23

Updated: 2026-03-31

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 10

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

Severity: Critical

CVSS v3

Base Score: 9.8

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

Severity: Critical

CVSS v4

Base Score: 9.3

Vector: 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

Severity: Critical

EPSS

EPSS: 0.53796

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