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Fencer Vulns
high 7.5

CVE-2023-3417 json

File Extension Spoofing using the Text Direction Override Character

published 2023-07-24 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44083

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

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.

Patch / fix

  • Mozilla Thunderbird 102.13.1, 115.0.1
  • thunderbird Debian 12 1:102.13.1-1~deb12u1
  • thunderbird Debian 14, Debian 13 1:102.13.1-1

debian advisories DEBIAN-CVE-2023-3417

  • thunderbird Ubuntu 20.04 LTS 1:102.15.0+build1-0ubuntu0.20.04.1
  • thunderbird Ubuntu 22.04 LTS 1:102.15.0+build1-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-3417

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • thunderbird RHEL 7 102.14.0-1.el7_9
  • thunderbird RHEL 9 102.14.0-1.el9_2
  • thunderbird RHEL 8 102.14.0-1.el8_8
  • thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 102.14.0-1.el8_2
  • thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 102.14.0-1.el8_4
  • thunderbird RHEL 9.0 EUS 102.14.0-1.el9_0
  • thunderbird RHEL 8.6 EUS 102.14.0-1.el8_6
  • thunderbird RHEL 8.1 E4S 102.14.0-1.el8_1

red hat advisories RHSA-2023:4496RHSA-2023:4500RHSA-2023:4495RHSA-2023:4499RHSA-2023:4494RHSA-2023:4493

  • MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP5 +3 more 115.0.1-150200.8.124.1

suse advisories SUSE-SU-2023:3059-1

  • MozillaThunderbird openSUSE Tumbleweed 102.13.1-1.1

opensuse advisories openSUSE-SU-2024:13072-1

  • thunderbird AlmaLinux 8 102.14.0-1.el8_8.alma
  • thunderbird AlmaLinux 9 102.14.0-1.el9_2.alma

almalinux advisories ALSA-2023:4497ALSA-2023:4499

  • thunderbird Rocky Linux 9 102.14.0-1.el9_2
  • thunderbird Rocky Linux 8 102.14.0-1.el8_8

rocky linux advisories RLSA-2023:4499RLSA-2023:4497

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-3417 updated cvss 7.5

thunderbird: File Extension Spoofing using the Text Direction Override Character

  • Red Hat Enterprise Linux 6 thunderbird
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) thunderbird 102.14.0-1.el8_8
    fixed: vendor fix RHSA-2023:4497
  • Red Hat Enterprise Linux AppStream (v. 9) thunderbird 102.14.0-1.el9_2
    fixed: vendor fix RHSA-2023:4499
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird 102.14.0-1.el8_2
    fixed: vendor fix RHSA-2023:4496
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird 102.14.0-1.el8_4
    fixed: vendor fix RHSA-2023:4500
  • Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird 102.14.0-1.el8_1
    fixed: vendor fix RHSA-2023:4492
  • Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird 102.14.0-1.el8_2
    fixed: vendor fix RHSA-2023:4496
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird 102.14.0-1.el8_4
    fixed: vendor fix RHSA-2023:4500
show 5 more
  • Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird 102.14.0-1.el8_6
    fixed: vendor fix RHSA-2023:4493
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird 102.14.0-1.el9_0
    fixed: vendor fix RHSA-2023:4494
  • Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird 102.14.0-1.el8_2
    fixed: vendor fix RHSA-2023:4496
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird 102.14.0-1.el8_4
    fixed: vendor fix RHSA-2023:4500
  • Red Hat Enterprise Linux Client (v. 7) thunderbird 102.14.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) thunderbird 102.14.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) thunderbird 102.14.0-1.el7_9
    fixed: vendor fix RHSA-2023:4495

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

  • Mozilla Thunderbird

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.