CVE-2023-5981

Gnutls: timing side-channel in the rsa-psk authentication

MEDIUM

5.9

CVSS Score

Published: November 28, 2023 at 11:49 AM UTC

Updated: October 14, 2026 at 10:17 PM UTC

5 products affected across 4 vendorsDebian LinuxFedoraLinux

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Severity

MEDIUM5.9

Exploit prediction

EPSS 1%

Description

A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux · Debiandrupal

95%

10.0

Fedora · Fedora Projectrpm

95%

37 38

Gnutls · Gnu

95%

v < 3.8.2

Linux · Red Hat

95%

8.0 9.0

Enterprise Linux · Red Hatrpm

90%

All versions

Vendor states this is fixed in 0:3.6.16-5.el8_6.2 (unaffected)

Vendor states this is fixed in 0:3.6.16-7.el8_8.1 (unaffected)

Vendor states this is fixed in 0:3.6.16-8.el8_9 (unaffected)

Vendor states this is fixed in 0:3.7.6-21.el9_2.1 (unaffected)

Vendor states this is fixed in 0:3.7.6-23.el9_3.3 (unaffected)

Vendor states this is fixed in 6 (unknown)

Vendor states this is fixed in 7 (unknown)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references