CVE-2018-16868

Severity: medium (CVSS 5.6 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-12-03 · updated 2026-06-17
Weakness: CWE-203

Description

A Bleichenbacher type side-channel based padding oracle attack was found in the way gnutls handles verification of RSA decrypted PKCS#1 v1.5 data. An attacker who is able to run process on the same physical core as the victim process, could use this to extract plaintext or in some cases downgrade any TLS connections to a vulnerable server.

Affected products

[UNKNOWN] gnutls: through 3.6.4

References

http://cat.eyalro.net/
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00068.html
http://www.securityfocus.com/bid/106080
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16868
http://cat.eyalro.net/
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00017.html
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00068.html
http://www.securityfocus.com/bid/106080
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16868

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