CVE-2026-88779highunder attackCWE-119

CVE-2026-88779: high-severity vulnerability in NetScaler ADC

Memory overflow vulnerability leading to Denial of Service

Published · Updated

51Vexday Risk Score

Prioritize patching. It under exploitation confirmed by CISA.

ssvc Actcvss 8.7epss 0.6%
from disclosure to weapon
Published on NVDOct 4
CISA KEVOct 4
exploitation probability
0.6%top 53% of all CVEs
observed exploitation
yesCISA + VulnCheck
Action required by CISAfederal deadline: 2026-10-07

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.

In short

A memory overflow flaw in NetScaler ADC and Gateway allows attackers to crash the service by sending specially crafted requests, causing the application to stop working.

Technical detail

Buffer overflow vulnerability in NetScaler ADC and Gateway (CWE-119) exploitable via network-accessible input without authentication. Memory corruption leads to denial of service through application crash; affects versions before 14.1-73.41, 13.1-64.28, and FIPS variants.

Summary generated and translated by AI from the official 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.
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
Affected products
NetScaler · ADCNetScaler · Gateway
Related CVEs — NetScaler ADC

In the same product, most dangerous first.

CVE-2025-5777CRITICALNetScaler ADC and NetScaler Gateway - Insufficient input validation leading to memory overreadEPSS 100.0%KEVCVE-2026-19490CRITICALNetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2026-19490EPSS 23.2%KEVCVE-2025-7775CRITICALMemory overflow vulnerability leading to Remote Code Execution and/or Denial of ServiceEPSS 20.3%KEVCVE-2025-6543CRITICALMemory overflow vulnerability leading to unintended control flow and Denial of ServiceEPSS 10.6%KEVCVE-2026-3055CRITICALInsufficient input validation leading to memory overreadEPSS 4.0%KEVCVE-2026-8452HIGHMemory overflow vulnerability leading to unpredictable or erroneous behavior and Denial of ServiceEPSS 1.0%KEV
References
https://community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779