CVE-2022-1520

Name: CVE-2022-1520
Creator: NVD / NIST
Published: 2022-12-22T20:15:13.217+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.27%

Last modified Jun 17, 2026

CVE-2022-1520 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. When viewing an email message A, which contains an attached message B, where B is encrypted or digitally signed or both, Thunderbird may show an incorrect encryption or signature status. After opening and viewing the attached message B, when returning to the display of message A, the message A might be shown with the security status of message B. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

When viewing an email message A, which contains an attached message B, where B is encrypted or digitally signed or both, Thunderbird may show an incorrect encryption or signature status. After opening and viewing the attached message B, when returning to the display of message A, the message A might be shown with the security status of message B. This vulnerability affects Thunderbird < 91.9.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.27%

17.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions
Mozilla	Thunderbird	< 91.9

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1745019Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-18/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1745019Issue Tracking, Permissions Required, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2022-18/Vendor Advisory

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-1520?

How severe is CVE-2022-1520?

CVE-2022-1520 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.

How do I fix CVE-2022-1520?

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-2022-1520?

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

Scan your code now

Source: NVD / NIST