Detections
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CVE-2026-88771

critical

Description

Improper input validation vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. This issue affects ADC: before 14.1-73.37, before 13.1-64.23, before 14.1-73.37 FIPS, and before 13.1.37.279 FIPS and NDcPP; Gateway: before 14.1-73.37 and before 13.1-64.23 leading to an unauthenticated attacker to execute arbitrary commands.

References

https://www.cisa.gov/news-events/alerts/2026/09/27/cisa-adds-two-known-exploited-vulnerabilities-catalog

https://www.bleepingcomputer.com/news/security/citrix-admins-warned-to-shut-down-netscalers-over-2-exploited-zero-days/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88771

https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096

Details

Source: Mitre, NVD

Published: 2026-09-27

Updated: 2026-09-28

Known Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 9

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

Severity: High

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: 9.5

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

Severity: Critical

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