Memory Overflow in Base64 Decoding of Citrix NetScaler ADC and Gateway
CVE-2026-111337

8.7HIGH

Key Information:

Vendor

Citrix
Status
Netscaler Adc
Netscaler Gateway
Vendor
CVE Published:
13 November 2026

What is CVE-2026-111337?

A memory overflow vulnerability exists in the Base64 decoding component of advanced policy expressions in Citrix NetScaler ADC and Citrix NetScaler Gateway. This flaw can lead to unpredictable behavior or, in some cases, result in a Denial of Service. Exploiting this vulnerability could compromise the reliability and availability of the affected systems, making it essential for organizations to apply the recommended patches and updates provided by Citrix.

Affected Version(s)

NetScaler ADC 0 < 14.1-73.57

NetScaler ADC 0 < 13.1-64.39

NetScaler ADC 0 < 14.1-73.58 FIPS

References

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

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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