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Case File

CVE-2013-4238

MEDIUM · CVSS 4.3 EPSS 5.35%

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2013-08-18 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 4.3. See the original NVD description below for full technical details.

CVE
CVE-2013-4238
Severity
MEDIUM
CVSS
4.3
EPSS
5.35%

Original NVD Description

The ssl.match_hostname function in the SSL module in Python 2.6 through 3.4 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.