The ssl.match_hostname function in CPython (aka Python) before 2.7.9 and 3.x before 3.3.3 does not properly handle wildcards in hostnames,…

Description

The ssl.match_hostname function in CPython (aka Python) before 2.7.9 and 3.x before 3.3.3 does not properly handle wildcards in hostnames, which might allow man-in-the-middle attackers to spoof servers via a crafted certificate.

Scores

EPSS (exploitation in 30 days)

1.9% · top 21% of all CVEs (4 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.9.

Weakness

• n/a
• CWE-19 (opens in a new tab)All about CWE-19 and its CVEs

Affected products

• n/a

  • affected n/a

References (7)

• [oss-security] 20150518 CVE request: ssl.match_hostname(): sub string wildcard should not match IDNA prefix (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• RHSA-2016:1166 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• https://bugzilla.redhat.com/show_bug.cgi?id=1224999 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://hg.python.org/cpython/rev/10d0edadbcdd (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://bugs.python.org/issue17997 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 74707 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• [oss-security] 20150521 Re: CVE request: ssl.match_hostname(): sub string wildcard should not match IDNA prefix (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)

Badge for a README or a ticket

[![CVE-2013-7440](https://trackcve.app/badge/CVE-2013-7440.svg)](https://trackcve.app/cve/CVE-2013-7440)

Record last updated 6 Aug 2024, 18:09 UTC.