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CVE-2013-2099
Algorithmic complexity vulnerability in the ssl.match_hostname function in Python 3.2.x, 3.3.x, and earlier, and unspecified versions of…
Medium4.3EPSS 4.9%
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
Algorithmic complexity vulnerability in the ssl.match_hostname function in Python 3.2.x, 3.3.x, and earlier, and unspecified versions of python-backports-ssl_match_hostname as used for older Python versions, allows remote attackers to cause a denial of service (CPU consumption) via multiple wildcard characters in the common name in a certificate.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | Medium4.3 | AV:N/AC:M/Au:N/C:N/I:N/A:P |
- EPSS (exploitation in 30 days)
- 4.9% · top 7.9% of all CVEs (5 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
n/a
- affected n/a
References (10)
- https://bugzilla.redhat.com/show_bug.cgi?id=963260 (opens in a new tab)x_refsource_MISCx_transferred
- USN-1984-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- 55116 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- RHSA-2016:1166 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-1985-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- http://bugs.python.org/issue17980 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 55107 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
- RHSA-2014:1690 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
- USN-1983-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
- [oss-security] 20130515 Re: CVE Request (minor) -- Python 3.2: DoS when matching certificate with many '*' wildcard characters {was: CVE Request (minor) -- python-backports-ssl_match_hostname: Denial of service when matching certificate with many '*' wildcard characters } (opens in a new tab)mailing-listx_refsource_MLISTx_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)
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[](https://trackcve.app/cve/CVE-2013-2099)Record last updated .