CVE-2023-21813
Published: 14 February 2023
Summary
CVE-2023-21813 is a high-severity Buffer Over-read (CWE-126) vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 5.6% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
Windows Secure Channel, the component responsible for implementing TLS and other cryptographic protocols in Windows, is affected by CVE-2023-21813, a denial-of-service vulnerability. The flaw carries a CVSS 7.5 rating reflecting network attack vector, low complexity, and no required privileges or user interaction, with a high impact on availability and no impact on confidentiality or integrity; associated CWEs include CWE-126.
An unauthenticated remote attacker can send specially crafted network traffic to a vulnerable Windows system and trigger a crash or service disruption in the Secure Channel implementation, resulting in loss of availability for dependent services such as RDP, HTTPS, or any application relying on Schannel.
Microsoft Security Response Center advisories at the referenced URLs describe available security updates that address the issue and should be applied according to organizational patch-management processes.
The associated EPSS score has remained flat at 0.1372 with no material increase after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25979
Vulnerability details
Windows Secure Channel Denial of Service Vulnerability
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.