CVE-2026-88779 - Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability (known exploited)
Added to CISA KEV on 2026-10-04. 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.
CRITICAL
CISA KEV
ACTIVELY EXPLOITED
Severity & confidence
Source severitycritical
Platform severitycritical
Confidenceconfirmed
Exploitationactively exploited
CVSS-
Affected
Vendorscitrix
ProductsNetScaler
Reporting sources (3)
CISA - Known Exploited Vulnerabilities
CISA - Cybersecurity Advisories
NIST NVD - National Vulnerability Database
๐ฏ Why should I care?
- On the CISA Known Exploited Vulnerabilities list.
- Credible sources report active exploitation in the wild.
Timeline & provenance
Published2026-10-04T00:00:00
Last updated2026-10-21T04:58:06
Ingested2026-10-04T19:12:29
FreshnessNEAR-REAL-TIME
Threat typeexploitation
Recommended action
Apply the vendor-supplied patch immediately. Review vendor and CISA guidance for detection and mitigation.
Next steps
- Identify affected systems in your environment.
- Apply the vendor patch or mitigation guidance.
- Review logs for indicators described in the advisory.
- Follow the affected vendor/product to track updates.
Confidence explanation
This object is reported by 3 independent sources.
Source type: gov ยท Original: CISA - Known Exploited Vulnerabilities
