Citrix NetScaler ADC/Gateway flaws patched
Citrix patched two NetScaler ADC and Gateway vulnerabilities enabling denial of service and security policy bypass.
Sourcecert.ssi.gouv.fr — open the original
What to check
- Applies to
- The 2 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2026-19490 as exploited in the wild.
CERT-FR issued an advisory covering two vulnerabilities in Citrix NetScaler ADC and NetScaler Gateway products, tracked as CVE-2026-19489 and CVE-2026-19490. The flaws allow an attacker to trigger a remote denial of service, bypass security policy controls, and cause an unspecified security issue as described by the vendor. Affected versions include NetScaler ADC and Gateway builds prior to 13.1-63.21 and 14.1-73.32, as well as FIPS-compliant variants prior to 13.1-37.277 and 14.1-73.32 FIPS.
Citrix released a security bulletin (CTX696939) on August 19, 2026 detailing the issues and providing patched versions. No indicators of active exploitation are mentioned in this advisory; organizations running affected NetScaler ADC or Gateway deployments should apply the vendor-provided fixes referenced in the bulletin as soon as possible.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1059
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