Is CVE-2013-6422 being actively exploited?

CVE-2013-6422 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2013-6422?

CVE-2013-6422 has a CVSS 2.0 base score of 4.0 (MEDIUM).

CVE-2013-6422

MEDIUM · CVSS 4.0EPSS 2.8%EU EUVD

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.

Key facts

CVSS score: 4.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:H/Au:N/C:P/I:P/A:N
Weakness (CWE): CWE-20
EPSS score: 2.8% (87th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2013-6234)
Published: December 23, 2013
NVD last modified: June 17, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2013-6234 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.

View on the EU Vulnerability Database

Affected products

canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
canonical / ubuntu linux
debian / debian linux
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl
haxx / libcurl

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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