CVE-2024-5690
By monitoring the time certain operations take, an attacker could have guessed which external protocol handlers were functional on a user's system.
Does this matter?
Lower severity and a low EPSS score (0.74%). Track it; it rarely justifies an emergency change on its own.
Description
By monitoring the time certain operations take, an attacker could have guessed which external protocol handlers were functional on a user's system. This vulnerability affects Firefox < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.
- CVSS 3.1
- 4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
- EPSS
- 0.74% probability · 54th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird · debian/debian linux
- Source
- security@mozilla.org
EPSS 0.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1883693Issue Tracking, Permissions Required
- https://lists.debian.org/debian-lts-announce/2024/06/msg00000.htmlMailing List
- https://lists.debian.org/debian-lts-announce/2024/06/msg00010.htmlMailing List
- https://www.mozilla.org/security/advisories/mfsa2024-25/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-26/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-28/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1883693Issue Tracking, Permissions Required
- https://lists.debian.org/debian-lts-announce/2024/06/msg00000.htmlMailing List
- https://lists.debian.org/debian-lts-announce/2024/06/msg00010.htmlMailing List
- https://www.mozilla.org/security/advisories/mfsa2024-25/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-26/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2024-28/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.