Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2021-43528

6.5 · MEDIUM

Thunderbird unexpectedly enabled JavaScript in the composition area.

Published Dec 8, 2021CWE-269EPSS 1.31%

Overview

CVE-2021-43528 is a medium-severity vulnerability. It was published on December 8, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Thunderbird unexpectedly enabled JavaScript in the composition area. The JavaScript execution context was limited to this area and did not receive chrome-level privileges, but could be used as a stepping stone to further an attack with other vulnerabilities. This vulnerability affects Thunderbird < 91.4.0.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mozilla.org/show_bug.cgi?id=1742579Reflists.debian.org/debian-lts-announce/2022/01/msg00001.htmlRefsecurity.gentoo.org/glsa/202208-14Refwww.debian.org/security/2022/dsa-5034Refwww.mozilla.org/security/advisories/mfsa2021-54/Refbugzilla.mozilla.org/show_bug.cgi?id=1742579Reflists.debian.org/debian-lts-announce/2022/01/msg00001.htmlRefsecurity.gentoo.org/glsa/202208-14Refwww.debian.org/security/2022/dsa-5034Refwww.mozilla.org/security/advisories/mfsa2021-54/

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43528?

CVE-2021-43528 is a medium-severity vulnerability. It was published on December 8, 2021 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2021-43528?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-43528?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43528?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43528 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related MEDIUM CVEs from 2021

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999