Privilege escalation in Mozilla Thunderbird
CVE-2021-43528
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.
Vulnerability class: Privilege Escalation
EPSS: 0.013 (66.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.
Affected products
- Mozilla Thunderbird — versions unspecified
- Debian Debian_linux — versions 9.0, 10.0, 11.0
Weakness classification (CWE)
References
- security@mozilla.org (x_refsource_MISC, Vendor Advisory)
- security@mozilla.org (Permissions Required, x_refsource_MISC, Issue Tracking, Broken Link, Vendor Advisory)
- security@mozilla.org (vendor-advisory, Third Party Advisory, Issue Tracking, x_refsource_DEBIAN)
- security@mozilla.org (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
- security@mozilla.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
Frequently asked questions
- What is CVE-2021-43528?
- CVE-2021-43528 is a medium-severity vulnerability in Mozilla Thunderbird, classified under Improper Privilege Management. CVSS score: 6.5/10. Published 2021-12-08.
- How severe is CVE-2021-43528?
- Medium severity. CVSS v3 base score is 6.5 out of 10.