CVE-2020-12823

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2020-05-12 · updated 2026-06-17
Weakness: CWE-120

Description

OpenConnect 8.09 has a buffer overflow, causing a denial of service (application crash) or possibly unspecified other impact, via crafted certificate data to get_cert_name in gnutls.c.

Affected products

Debian Linux: 8.0
Fedoraproject Fedora: 30, 31, 32
Infradead Openconnect: 8.09
openSUSE Leap: 15.1, 15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00056.html
https://bugs.gentoo.org/721570
https://gitlab.com/openconnect/openconnect/-/merge_requests/108
https://lists.debian.org/debian-lts-announce/2020/05/msg00015.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/25MFX4AZE7RDCUWOL4ZOE73YBOPUMQDX/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AYSXLXAPXD2T73T6JMHI5G2WP7KHAGMN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BEVTIH5UFX35CC7MVSYBGRM3D66ACFD5/
https://security.gentoo.org/glsa/202006-15
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00056.html
https://bugs.gentoo.org/721570

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