Memory Overflow in Citrix NetScaler ADC and Gateway
CVE-2026-111340

8.7HIGH

Key Information:

Vendor

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

What is CVE-2026-111340?

A memory overflow vulnerability exists within the knowledge-based authentication (KBA) mechanism in Citrix NetScaler ADC and Citrix NetScaler Gateway. This flaw can lead to unpredictable behavior or even result in a Denial of Service, potentially affecting the availability and reliability of services relying on these products. Users are advised to review configurations and apply necessary security measures to mitigate risks associated with this vulnerability.

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

.