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CVE-2011-0091
Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES…
Medium6.4EPSS 5.5%
- Published
- Updated
- Reserved
- Assigned by
- microsoft
Description
Kerberos in Microsoft Windows Server 2008 R2 and Windows 7 does not prevent a session from changing from strong encryption to DES encryption, which allows man-in-the-middle attackers to spoof network traffic and obtain sensitive information via a DES downgrade, aka "Kerberos Spoofing Vulnerability."
Timeline
ID reserved
By microsoft
- 51 days later
· 51 days later
Published
- 13 years later
· 13 years 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 |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
- EPSS (exploitation in 30 days)
- 5.5% · top 7.2% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.
Weakness
Affected products
n/a
- affected n/a
References (9)
- 46140 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 70835 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- http://support.avaya.com/css/P8/documents/100127250 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 43257 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- ms-kerberos-spoofing(64901) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
- MS11-013 (opens in a new tab)vendor-advisoryx_refsource_MSx_transferred
- ADV-2011-0326 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 1025048 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- oval:org.mitre.oval:def:12498 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
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)
- 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-2011-0091)Record last updated .