Citrix NetScaler ADC and NetScaler Gateway Buffer Overflow Vulnerability (CVE-2023-6549)
Severity: high · Patch status: unknown · Since 2024-01-17 · CVE-2023-6549
Citrix NetScaler ADC and NetScaler Gateway contain a buffer overflow vulnerability that allows for a denial-of-service when configured as a Gateway (VPN virtual server, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server. CISA added CVE-2023-6549 to its Known Exploited Vulnerabilities catalog on Jan 17, 2024, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Feb 7, 2024 (BOD 22-01); treat that as the outer limit.
Sources
All live incidents on Threat Watch
