CVE-2013-6422 json
The GnuTLS backend in libcurl 7.21.4 through 7.33.0, when disabling digital signature verification (CURLOPT_SSL_VERIFYPEER), also disables…
published 12y ago modified 4mo ago also EUVD-2013-6234
- cvss
- 4.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.8%
- EPSS 2.8% chance of exploitation in 30 days, percentile 86%
- public exploits
- 0
- none known
Summary
The 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.
Patch / fix
- curl Debian 14, Debian 13, Debian 12 7.34.0-1
debian advisories DEBIAN-CVE-2013-6422
Is CVE-2013-6422 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2013-6422 updated cvss 2.6
curl: TLS/SSL certificate name check disabled with peer verification when using GnuTLS
-
Red Hat Enterprise Linux 5 curl Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurlnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.80% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 4.0 | AV:N/AC:H/Au:N/C:P/I:P/A:N |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
h20564.www2.hp.com
/hpsc/doc/public/display?docId=emr_na-c04463322
vendor-advisory
-
debian.org
/security/2013/dsa-2824
vendor-advisory
-
ubuntu.com
/usn/USN-2058-1
vendor-advisory
-
curl.haxx.se
/docs/adv_20131217.html
vendor-advisory
- oracle.com /technetwork/topics/security/cpujul2015-2367936.html
Sources
- CVE List CVE-2013-6422
- NVD CVE-2013-6422
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.