CVE-2013-6422

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Summary

CVECVE-2013-6422
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2013-12-23 22:55:02 UTC
Updated2026-04-29 01:13:23 UTC
DescriptionThe GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables the CURLOPT_SSL_VERIFYHOST check for CN or SAN host name fields, which makes it easier for remote attackers to spoof servers and conduct man-in-the-middle (MITM) attacks.

Risk And Classification

Primary CVSS: v2.0 4 from [email protected]

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

EPSS: 0.027610000 probability, percentile 0.846620000 (date 2026-07-21)

Problem Types: CWE-20 | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
High
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 12.04 - lts All
Operating System Canonical Ubuntu Linux 12.10 All All All
Operating System Canonical Ubuntu Linux 13.04 All All All
Operating System Canonical Ubuntu Linux 13.10 All All All
Operating System Debian Debian Linux 7.0 All All All
Application Haxx Libcurl 7.21.4 All All All
Application Haxx Libcurl 7.21.5 All All All
Application Haxx Libcurl 7.21.6 All All All
Application Haxx Libcurl 7.21.7 All All All
Application Haxx Libcurl 7.22.0 All All All
Application Haxx Libcurl 7.23.0 All All All
Application Haxx Libcurl 7.23.1 All All All
Application Haxx Libcurl 7.24.0 All All All
Application Haxx Libcurl 7.25.0 All All All
Application Haxx Libcurl 7.26.0 All All All
Application Haxx Libcurl 7.27.0 All All All
Application Haxx Libcurl 7.28.0 All All All
Application Haxx Libcurl 7.28.1 All All All
Application Haxx Libcurl 7.29.0 All All All
Application Haxx Libcurl 7.30.0 All All All
Application Haxx Libcurl 7.31.0 All All All
Application Haxx Libcurl 7.32.0 All All All
Application Haxx Libcurl 7.33.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Oracle Critical Patch Update - July 2015 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
Debian -- Security Information -- DSA-2824-1 curl af854a3a-2127-422b-91ae-364da2661108 www.debian.org
cURL - Security Advisory (cert name check ignore GnuTLS) af854a3a-2127-422b-91ae-364da2661108 curl.haxx.se Vendor Advisory
USN-2058-1: curl vulnerability | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
HP Support document - HP Support Center af854a3a-2127-422b-91ae-364da2661108 h20564.www2.hp.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 670302 EulerOS Security Update for curl (EulerOS-SA-2021-1774)

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