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Vulnerability details: VCID-zx9p-cab8-6ubc
Vulnerability ID VCID-zx9p-cab8-6ubc
Aliases CVE-2013-4238
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 2.6
Risk 1.3
Affected and Fixed Packages Package Details
Weaknesses (0)
There are no known CWE.
System Score Found at
epss 0.01382 https://api.first.org/data/v1/epss?cve=CVE-2013-4238
epss 0.01382 https://api.first.org/data/v1/epss?cve=CVE-2013-4238
epss 0.01382 https://api.first.org/data/v1/epss?cve=CVE-2013-4238
epss 0.01382 https://api.first.org/data/v1/epss?cve=CVE-2013-4238
epss 0.01382 https://api.first.org/data/v1/epss?cve=CVE-2013-4238
cvssv3.1 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2013-4238.json
https://api.first.org/data/v1/epss?cve=CVE-2013-4238
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-4238
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-1912
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
719566 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=719566
996381 https://bugzilla.redhat.com/show_bug.cgi?id=996381
RHSA-2013:1527 https://access.redhat.com/errata/RHSA-2013:1527
RHSA-2013:1582 https://access.redhat.com/errata/RHSA-2013:1582
USN-1982-1 https://usn.ubuntu.com/1982-1/
USN-1983-1 https://usn.ubuntu.com/1983-1/
USN-1984-1 https://usn.ubuntu.com/1984-1/
USN-1985-1 https://usn.ubuntu.com/1985-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.80637
EPSS Score 0.01382
Published At June 4, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-04T17:08:35.412624+00:00 Debian Importer Import https://security-tracker.debian.org/tracker/data/json 38.6.0