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CVE-2010-4020
MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users…
- 6.3MediumCVSS base score
- 1.9%Exploitation in 30 daysEPSS · top 20% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
MIT Kerberos 5 (aka krb5) 1.8.x through 1.8.3 does not reject RC4 key-derivation checksums, which might allow remote authenticated users to forge a (1) AD-SIGNEDPATH or (2) AD-KDC-ISSUED signature, and possibly gain privileges, by leveraging the small key space that results from certain one-byte stream-cipher operations.
Timeline
ID reserved
By mitre
- 43 days later
· 43 days later
Published
- 14 years later
· 14 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 | 3.0 | Medium6.3 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L |
- EPSS (exploitation in 30 days)
- 1.9% · top 20% of all CVEs (10 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Affected products
n/a
- affected n/a
References
23
- ADV-2010-3094 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- http://www.oracle.com/technetwork/topics/security/cpujul2015-2367936.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- MDVSA-2010:246 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
- FEDORA-2010-18425 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- http://kb.vmware.com/kb/1035108 (opens in a new tab)x_refsource_CONFIRMx_transferred
- ADV-2010-3118 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 20101130 MITKRB5-SA-2010-007 Multiple checksum handling vulnerabilities [CVE-2010-1324 CVE-2010-1323 CVE-2010-4020 CVE-2010-4021] (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- SUSE-SR:2010:023 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- http://www.vmware.com/security/advisories/VMSA-2011-0007.html (opens in a new tab)x_refsource_CONFIRMx_transferred
- APPLE-SA-2011-03-21-1 (opens in a new tab)vendor-advisoryx_refsource_APPLEx_transferred
- http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt (opens in a new tab)x_refsource_CONFIRMx_transferred
- ADV-2010-3095 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 42399 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- [security-announce] 20110428 VMSA-2011-0007 VMware ESXi and ESX Denial of Service and third party updates for Likewise components and ESX Service Console (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
- 1024803 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 20110428 VMSA-2011-0007 VMware ESXi and ESX Denial of Service and third party updates for Likewise components and ESX Service Console (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- FEDORA-2010-18409 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
- SUSE-SR:2010:024 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
- RHSA-2010:0925 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-1030-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- 69608 (opens in a new tab)vdb-entryx_refsource_OSVDBx_transferred
- 45117 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- http://support.apple.com/kb/HT4581 (opens in a new tab)x_refsource_CONFIRMx_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)
- EUVD EUVD-2010-3996 (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-2010-4020)Record last updated .