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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade curl | Jul 30, 2024 | Dec 23, 2013 |
| Freebsd | — | Upgrade curl | Dec 10, 2025 | Dec 18, 2013 |
| Gentoo Linux | — | Upgrade net-misc/curl. | Oct 30, 2017 | Dec 23, 2013 |
| Hpsmh | — | Upgrade to the latest version of HP System Management Homepage | Oct 13, 2015 | Dec 23, 2013 |
| Huawei Euleros 2_0_sp2 | — | Upgrade libcurlUpgrade libcurl-develUpgrade curl | Jun 17, 2020 | Dec 23, 2013 |
| Huawei Euleros 2_0_sp3 | — | Upgrade libcurlUpgrade libcurl-develUpgrade curl | Apr 30, 2021 | Dec 23, 2013 |
| Oracle Solaris | — | Upgrade entire/ to version 11.4-11.4.0.0.1.15.0 on Solaris 11.4 | Oct 19, 2018 | Dec 23, 2013 |
| Ubuntu | — | Upgrade libcurl3-gnutls | Nov 8, 2024 | Dec 23, 2013 |
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