CVEvulnerability

CVE-2026-88779

8.7 HIGH Known exploited Published 2026-10-04 Modified 2026-10-05 Official page ↗

CISA Known Exploited Vulnerability

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

Citrix NetScaler ADC (formerly Citrix ADC) and Citrix NetScaler Gateway (formerly Citrix Gateway) contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow for a denial of service.

Added to KEV: 2026-10-04
Remediation due: 2026-10-07
Ransomware use: Unknown
Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Notes: https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174 ; https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/ ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-88779

Status: Analyzed
Published: 2026-10-04
Last modified: 2026-10-05
Assigner: 50a63c94-1ea7-4568-8c11-eb79e7c5a2b5
CVSS 4.0 (50a63c94-1ea7-4568-8c11-eb79e7c5a2b5): 8.7 HIGH — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1 ([email protected]): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses: CWE-119

Description

Vulnerability in NetScaler ADC and NetScaler Gateway. This issue affects ADC: before 14.1-73.41, before 13.1-64.28, before 14.1-73.41 FIPS, and before 13.1-37.282; Gateway: before 14.1-73.41 and before 13.1-64.28.

Affected configurations

• citrix netscaler application delivery controller (>= 13.1 < 13.1-37.282) • citrix netscaler application delivery controller (>= 13.1 < 13.1-64.28) • citrix netscaler application delivery controller (>= 14.1 < 14.1-73.41) • citrix netscaler application delivery controller (>= 14.1-66.68 <= 14.1-73.41) • citrix netscaler gateway (>= 13.1 < 13.1-64.28) • citrix netscaler gateway (>= 14.1 < 14.1-73.41)

Weakness · CWE (1)

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer weakness

References