CVE-2023-3417

7.5 highEPSS 0.7%

High (7.5). EPSS 0.7% chance of exploitation in the next 30 days.

Thunderbird allowed the Text Direction Override Unicode Character in filenames. An email attachment could be incorrectly shown as being a document file, while in fact it was an executable file. Newer versions of Thunderbird will strip the character and show the correct file extension. This vulnerability affects Thunderbird < 115.0.1 and Thunderbird < 102.13.1.

Severity

CVSS 3.1

7.5 high

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.7% chance of exploitation in the next 30 days; higher than 51% of CVEs (scores of 2026-10-31)
Published: 2023-07-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

debian:debian_linux
mozilla:thunderbird

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1835582
https://lists.debian.org/debian-lts-announce/2023/07/msg00032.html
https://www.debian.org/security/2023/dsa-5463
https://www.mozilla.org/security/advisories/mfsa2023-27/
https://www.mozilla.org/security/advisories/mfsa2023-28/

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