Vulnerability · Published Jan 13, 2026 · Assigned by microsoft
CVE-2026-20833Windows Kerberos Information Disclosure Vulnerability
Medium 5.5
In plain English
A medium-severity broken cryptography in Windows Server 2008 R2 Service Pack 1 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.5%top 54.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC
Official description
Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.
Affected products (as reported)
Weakness: CWE-327 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C
References
- Windows Kerberos Information Disclosure Vulnerability vendor-advisory, patch