Citrix NetScaler ADC/Gateway are widely deployed enterprise network appliances; a remote DoS can disrupt VPNs, load balancing and remote access, impacting business operations.
CVE-2026-88775
Remote memory overflow in Citrix NetScaler causing DoS
Is CVE-2026-88775 being exploited?
Not confirmed. CVE-2026-88775 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-88775?
CVE-2026-88775 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-88775?
Yes. A fix has been recorded for CVE-2026-88775. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-88775 affect?
CVE-2026-88775 affects Citrix NetScaler ADC (versions before 14.1-73.37; before 13.1-64.23; FIPS/NDcPP variants), Citrix NetScaler Gateway (versions before 14.1-73.37; before 13.1-64.23). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-88775?
Upgrade to fixed versions (>=14.1-73.37 or >=13.1-64.23) or apply vendor mitigations.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote memory overflow allows attackers to trigger unpredictable behavior or deny service of NetScaler ADC/Gateway appliances.
Immediate action required