vulnerability
Red Hat: CVE-2020-11501: CVE-2020-11501 gnutls: DTLS client hello contains a random value of all zeroes (Multiple Advisories)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 6 | (AV:N/AC:M/Au:N/C:P/I:P/A:N) | Apr 3, 2020 | May 1, 2020 | Aug 11, 2025 |
Severity
6
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:N)
Published
Apr 3, 2020
Added
May 1, 2020
Modified
Aug 11, 2025
Description
GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.
Solutions
redhat-upgrade-gnutlsredhat-upgrade-gnutls-credhat-upgrade-gnutls-c-debuginforedhat-upgrade-gnutls-daneredhat-upgrade-gnutls-dane-debuginforedhat-upgrade-gnutls-debuginforedhat-upgrade-gnutls-debugsourceredhat-upgrade-gnutls-develredhat-upgrade-gnutls-utilsredhat-upgrade-gnutls-utils-debuginfo
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