CVE-2023-3417

Name: CVE-2023-3417
Creator: NVD / NIST
Published: 2023-07-24T11:15:09.953+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.56%

Last modified Jun 17, 2026

CVE-2023-3417 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.56% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.56%

42.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Mozilla	Thunderbird	< 102.13.1
Mozilla	Thunderbird	>= 115.0, < 115.0.1
Debian	Debian Linux	10.0
Debian	Debian Linux	11.0
Debian	Debian Linux	12.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1835582Permissions Required
https://lists.debian.org/debian-lts-announce/2023/07/msg00032.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2023/dsa-5463Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-28/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1835582Permissions Required
https://lists.debian.org/debian-lts-announce/2023/07/msg00032.htmlMailing List, Third Party Advisory
https://www.debian.org/security/2023/dsa-5463Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-27/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-28/Vendor Advisory

Timeline

Published: Jul 24, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3417?

How severe is CVE-2023-3417?

CVE-2023-3417 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.56% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3417?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-3417?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST