CVE-2026-20833Windows Kerberos Information Disclosure Vulnerability
- 5.5MediumCVSS base score
- 0.53%Exploitation in 30 daysEPSS · top 54% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.
Timeline
ID reserved
By microsoft
- 41 days later
· 41 days later
Published
- 7 months later
· 7 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | Medium5.5 | 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 |
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.53% · top 54% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
Microsoft · Windows Server 2008 R2 Service Pack 1
- affected 6.1.7601.0 – < 6.1.7601.28117
Microsoft · Windows Server 2008 R2 Service Pack 1 (Server Core installation)
- affected 6.1.7601.0 – < 6.1.7601.28117
Microsoft · Windows Server 2008 Service Pack 2
- affected 6.0.6003.0 – < 6.0.6003.23717
Microsoft · Windows Server 2008 Service Pack 2 (Server Core installation)
- affected 6.0.6003.0 – < 6.0.6003.23717
Microsoft · Windows Server 2012
- affected 6.2.9200.0 – < 6.2.9200.25868
Microsoft · Windows Server 2012 (Server Core installation)
- affected 6.2.9200.0 – < 6.2.9200.25868
Microsoft · Windows Server 2012 R2
- affected 6.3.9600.0 – < 6.3.9600.22968
Microsoft · Windows Server 2012 R2 (Server Core installation)
- affected 6.3.9600.0 – < 6.3.9600.22968
Microsoft · Windows Server 2016
- affected 10.0.14393.0 – < 10.0.14393.8783
Microsoft · Windows Server 2016 (Server Core installation)
- affected 10.0.14393.0 – < 10.0.14393.8783
Microsoft · Windows Server 2019
- affected 10.0.17763.0 – < 10.0.17763.8276
Microsoft · Windows Server 2019 (Server Core installation)
- affected 10.0.17763.0 – < 10.0.17763.8276
Microsoft · Windows Server 2022
- affected 10.0.20348.0 – < 10.0.20348.4648
Microsoft · Windows Server 2022, 23H2 Edition (Server Core installation)
- affected 10.0.25398.0 – < 10.0.25398.2092
Microsoft · Windows Server 2025
- affected 10.0.26100.0 – < 10.0.26100.32230
Microsoft · Windows Server 2025 (Server Core installation)
- affected 10.0.26100.0 – < 10.0.26100.32230
References
References1
- Windows Kerberos Information Disclosure Vulnerability (opens in a new tab)vendor-advisorypatch
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-2153 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-20833)Record last updated .