CVE-2023-21819
Published: 14 February 2023
Summary
CVE-2023-21819 is a high-severity Out-of-bounds Read (CWE-125) vulnerability in Microsoft Windows 10 1809. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 4.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2023-21819 is a denial of service vulnerability affecting the Windows Secure Channel component. It received a CVSS 3.1 score of 7.5 reflecting network attackability with low complexity, no privileges or user interaction required, and high impact solely on availability, along with association to CWE-125.
An unauthenticated remote attacker can send crafted network traffic to trigger the flaw and disrupt service availability in the Secure Channel implementation.
Microsoft has published an advisory entry for CVE-2023-21819 that security practitioners can reference for patch and mitigation details.
The EPSS score rose from a low baseline to a peak of 0.3919 before receding to the current value of 0.2138, indicating a period of elevated exploitation interest after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-25985
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.