CVE-2026-3055

Name: CVE-2026-3055
Creator: NVD / NIST
Published: 2026-03-23T21:17:17.477+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.3/10Actively ExploitedEPSS 84.00%

Last modified Jun 17, 2026

CVE-2026-3055 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. Insufficient input validation in NetScaler ADC and NetScaler Gateway when configured as a SAML IDP leading to memory overread. CISA has confirmed active exploitation in the wild. EPSS estimates a 84.00% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.8/10

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

CVSS 4.0

9.3/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

84.00%

99.7th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Apr 2, 2026.

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Citrix	Netscaler Application Delivery Controller	>= 13.1, < 13.1-37.262
Citrix	Netscaler Application Delivery Controller	>= 13.1, < 13.1-62.23
Citrix	Netscaler Application Delivery Controller	>= 14.1, < 14.1-60.58
Citrix	Netscaler Gateway	>= 13.1, < 13.1-62.23
Citrix	Netscaler Gateway	>= 14.1, < 14.1-60.58

References

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX696300Vendor Advisory
https://labs.watchtowr.com/please-we-beg-just-one-weekend-free-of-appliances-citrix-netscaler-cve-2026-3055-memory-overread-part-2/Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-3055US Government Resource

Timeline

Published: Mar 23, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-3055?

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

How severe is CVE-2026-3055?

CVE-2026-3055 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 84.00% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2026-3055?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-3055?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST