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CVE-2013-4314

Published: Sep 30, 2013Updated: Apr 29, 2026 Sources: CVE List NVD GHSACWE-20
NVD MITRE
4.3CVSSMEDIUM
EPSS Score
1.2%
Top 35.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

The X509Extension in pyOpenSSL before 0.13.1 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.

CVSS Vector Breakdown

AV:NAC:MAu:NC:NI:PA:N
Exploitability
AV:NAccess Vector
Network
AC:MAccess Complexity
Medium
Au:NAuthentication
None
Impact
C:NConfidentiality
None
I:PIntegrity
Partial
A:NAvailability
None
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Weaknesses

CWE-20

Affected Products

n/an/a
pyOpenSSLPyPIOSS Libraries
pyopenssljean-paul calderone
Library
OSS Libraries / generic-library
ubuntu linuxcanonical
On-premOS
Operating Systems / linux-distro
pypipackage-ecosystemOSS Libraries
jean-paul calderoneoss-projectOSS Libraries
canonicalcommercialGBOperating Systemsaka canonical ltd.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Initial Access
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References

http://www.debian.org/security/2013/dsa-2763
debian.org
https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html
mail.python.org
https://bugzilla.redhat.com/show_bug.cgi?id=1005325
bugzilla.redhat.com
and 7 more references View all →

Timeline

Published
Sep 30, 2013
Last Updated
Apr 29, 2026

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