CVE-2026-88772KEV · OVERDUECWE-119

Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability

High · published September 27, 2026

Patch now

Confirmed exploited, and the score agrees

CVSS calls it high at 8.1. It is confirmed in active exploitation. It sits in the 70.2th percentile for exploit probability.

24
days past CISA
deadline
CVSS v3.1
8.1
EPSS
1%
Percentile
70.2
In the wild
Confirmed
What it is

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 Remote Code Execution or Denial of Service

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
9.5 · CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
EPSS
0.01301 · 70.2th percentile
Weakness
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer
Published
2026-09-27T21:16Z
KEV added
2026-09-27 · due 2026-09-30
Affected products (7)
ProductVersionsFixed in
citrix/netscaler_application_delivery_controller≥ 13.1, < 13.1-64.2313.1-64.23
citrix/netscaler_application_delivery_controller≥ 13.1, < 13.1.37.27913.1.37.279
citrix/netscaler_application_delivery_controller≥ 13.1, < 13.1.37.27913.1.37.279
citrix/netscaler_application_delivery_controller≥ 14.1, < 14.1-73.3714.1-73.37
citrix/netscaler_application_delivery_controller≥ 14.1-66.68, ≤ 14.1-73.37—
citrix/netscaler_gateway≥ 13.1, < 13.1-64.2313.1-64.23
citrix/netscaler_gateway≥ 14.1, < 14.1-73.3714.1-73.37
References (2)
https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697096&articleTitle=Citrix_NetScaler_ADC_and_Citrix_NetScaler_Gateway_Security_Bulletin_for_CVE_2026_88771_CVE_2026_88772_CVE_2026_88773_CVE_2026_88774_CVE_2026_88775_CVE_2026_88776_CVE_2026_88777_and_CVE_2026_88778 · 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88772 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 29 SEP 03:28Z
    EPSS moved — → 1%
    epss
  • 27 SEP 16:09Z
    Memory overflow vulnerability leading to Remote Code Execution or Denial of Service
    cvelistv5
  • 27 SEP 00:00Z
    Added to CISA KEV — remediate by Sep 30
    kev