CVE-2023-4967 — Denial of Service in NetScaler ADC and NetScaler Gateway when configured as a Ga

Denial of Service in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA Virtual Server

01What is this vulnerability?

Denial of Service in NetScaler ADC and NetScaler Gateway when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA Virtual Server

02Affected products

Vendor	Product	Versions
Cloud Software Group	NetScaler ADC	14.1, 13.1, 13.0, 13.1-FIPS, 12.1-FIPS, 12.1-NDcPP
Cloud Software Group	NetScaler Gateway	14.1, 13.1, 13.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-10-27T18:01:59.707Z
• Last modified: 2025-02-27T20:39:19.338Z

09References

• support.citrix.com — https://support.citrix.com/article/CTX579459/