Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
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.
What happened
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.
CISA lists it as exploited, added 04 Oct 2026.
Does it affect you
Names Citrix NetScaler ADC. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
support.citrix.com - Follow the vendor advisory for the fixed release and any interim mitigation.
community.citrix.com - 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.
cisa.gov
CISA’s notes for this entry:
- support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174
- 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: cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Forensics Triage Requirements: cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- nvd.nist.gov/vuln/detail/CVE-2026-88779
Affected, as published to NVD
- citrix-adc
- Citrix NetScaler ADC: 13.1 up to the fix in 13.1-37.282
The record
- NVD status
- Analyzed
- Published
- 04 Oct 2026, last modified 05 Oct 2026 (NVD)
- Severity
- CVSS 3.1 base score 7.5, High — computed here from the vector; NVD states 7.5.
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 04 Oct 2026; federal remediation due 07 Oct 2026. CISA entry
- Exploit probability
- EPSS 0.5%, 43rd percentile — FIRST, scored 05 Oct 2026. FIRST EPSS
- Vendor
- Citrix · NetScaler (CISA)
References on the NVD record
- support.citrix.com/support-home/kbsearch/article?articleNumber=CTX697174Vendor Advisory
- community.citrix.com/techzone-blogs/110_security-updates/understanding-and-addressing-cve-2026-88779-in-citrix-netscaler-adc-and-citrix-netscaler-gateway/MitigationVendor Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-88779US Government Resource
Reporting that names this identifier
- Citrix NetScaler security snafus get even worse amid more 0-day reports — The Register, 14 hr ago
- CISA flags new exploited NetScaler flaw as attackers crash appliances (CVE-2026-88779) — Help Net Security, 20 hr ago
- New NetScaler Zero-Day Exploited in Targeted Attacks Can Knock SAML Deployments Offline — The Hacker News, 1 d ago
- Exploitation of Citrix NetScaler Zero-Day Hits Appliances Patched Days Earlier — SecurityWeek, 1 d ago
- Citrix patches NetScaler SAML zero-day exploited in attacks — BleepingComputer, 2 d ago
- CISA Adds One Known Exploited Vulnerability to Catalog — CISA, 2 d ago
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.