Vulnerability Monitor

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CVE-2013-4314

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.

Security Impact Summary

CVE-2013-4314 is a security vulnerability that . Impacting 2 products from jean-paul_calderone, from canonical organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2013, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2013-09-30T21:55:09.583

Last Modified

2026-04-29T01:13:23.040

Status

Modified

Source

[email protected]

Severity

CVSSv2: 4.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	jean-paul_calderone	pyopenssl	≤ 0.13	Yes
Application	jean-paul_calderone	pyopenssl	0.7	Yes
Application	jean-paul_calderone	pyopenssl	0.8	Yes
Application	jean-paul_calderone	pyopenssl	0.9	Yes
Application	jean-paul_calderone	pyopenssl	0.10	Yes
Application	jean-paul_calderone	pyopenssl	0.11	Yes
Application	jean-paul_calderone	pyopenssl	0.11	Yes
Application	jean-paul_calderone	pyopenssl	0.11	Yes
Application	jean-paul_calderone	pyopenssl	0.12	Yes
Operating System	canonical	ubuntu_linux	10.04	Yes
Operating System	canonical	ubuntu_linux	12.04	Yes
Operating System	canonical	ubuntu_linux	12.10	Yes
Operating System	canonical	ubuntu_linux	13.04	Yes

References

http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html ([email protected])
http://www.debian.org/security/2013/dsa-2763 ([email protected])
http://www.openwall.com/lists/oss-security/2013/09/06/2 ([email protected])
http://www.ubuntu.com/usn/USN-1965-1 Vendor Advisory ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=1005325 ([email protected])
https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2013-11/msg00015.html (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2013/dsa-2763 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2013/09/06/2 (af854a3a-2127-422b-91ae-364da2661108)
http://www.ubuntu.com/usn/USN-1965-1 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=1005325 (af854a3a-2127-422b-91ae-364da2661108)
https://mail.python.org/pipermail/pyopenssl-users/2013-September/000478.html (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For jean-paul_calderone's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.