CVE-2023-3417
File Extension Spoofing using the Text Direction Override Character
- Published
- Updated
- Reserved
- Assigned by
- mozilla
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.
Timeline
ID reserved
By mozilla
- 28 days later
· 28 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.67% · top 48% of all CVEs (8 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected unspecified – < 115.0.1
- affected unspecified – < 102.13.1
References (5)
- https://bugzilla.mozilla.org/show_bug.cgi?id=1835582 (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2023/07/msg00032.html (opens in a new tab)x_transferred
- https://www.debian.org/security/2023/dsa-5463 (opens in a new tab)x_transferred
- https://www.mozilla.org/security/advisories/mfsa2023-27/ (opens in a new tab)x_transferred
- https://www.mozilla.org/security/advisories/mfsa2023-28/ (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-3417)Record last updated .