CVE-2023-5388

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-19 · updated 2026-06-17
Weakness: CWE-203

Description

NSS was susceptible to a timing side-channel attack when performing RSA decryption. This attack could potentially allow an attacker to recover the private data. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.

Affected products

Debian Linux: 10.0
Mozilla Firefox: before 115.9.0; before 124.0 — fixed in 115.9.0, 124.0
Mozilla Thunderbird: before 115.9.0 — fixed in 115.9.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.9.0, 124.0; Mozilla Thunderbird 115.9.0. Check the vendor advisory for mitigations.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1780432
https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html
https://www.mozilla.org/security/advisories/mfsa2024-12/
https://www.mozilla.org/security/advisories/mfsa2024-13/
https://www.mozilla.org/security/advisories/mfsa2024-14/
https://bugzilla.mozilla.org/show_bug.cgi?id=1780432
https://lists.debian.org/debian-lts-announce/2024/03/msg00010.html
https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html
https://www.mozilla.org/security/advisories/mfsa2024-12/
https://www.mozilla.org/security/advisories/mfsa2024-13/

Get alerted when CVE-2023-5388 or the next vulnerability affects your stack