All vulnerabilities
CVE-2026-3055

Citrix NetScaler Out-of-Bounds Read Vulnerability

Citrix NetScalerNetwork & edge
Open in ThreatlineRecord JSON
CVSS
9.3Critical
ExploitationExploited in the wildAdded to KEV 30 Mar 2026CISA KEV
Exploit odds (EPSS)4.04%Chance of exploitation activity in the next 30 days, higher than 90% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in66.59Also 62.23, 37.262CVE List
Federal deadline2 Apr 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA KEV

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 23 Mar 2026Exploit code publicMetasploit
  2. 23 Mar 2026, 20:21 UTCPublishedCVE List
  3. 30 Mar 2026Added to CISA KEVCISA KEV

Public exploit code and templates 2

  • Auxiliary moduleCitrix ADC (NetScaler) CVE-2026-3055 Scanner 23 Mar 2026Metasploit
  • Scanner templateCitrix NetScaler SAML IDP - Memory OverreadNuclei

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.

Text from CVE List

Affected versions 5

  • ADCaffected: 14.1 before 66.59CVE List
  • ADCaffected: 13.1 before 62.23CVE List
  • ADCaffected: 13.1 FIPS and NDcPP before 37.262CVE List
  • Gatewayaffected: 14.1 before 66.59CVE List
  • Gatewayaffected: 13.1 before 62.23CVE List

References 5