Vulnerability · Published Dec 8, 2021 · Assigned by mozilla
CVE-2021-43528
Medium 6.5
In plain English
A medium-severity security flaw in Thunderbird from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.3% (higher than 71% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.3%top 29.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | thunderbird | 91.4.0-2.el8_5.alma.plus | ALSA-2021:5045 |
| AlmaLinux:8 | thunderbird | 91.4.0-2.el8_5.alma | ALSA-2021:5045 |
| Alpine:v3.20 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43528 |
| Alpine:v3.21 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43528 |
| Alpine:v3.22 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43528 |
| Alpine:v3.23 | thunderbird | 91.4.0-r0 | ALPINE-CVE-2021-43528 |
| Debian:12 | thunderbird | 1:91.4.0-1 | DEBIAN-CVE-2021-43528 |
| Debian:13 | thunderbird | 1:91.4.0-1 | DEBIAN-CVE-2021-43528 |
| Debian:14 | thunderbird | 1:91.4.0-1 | DEBIAN-CVE-2021-43528 |
| Rocky Linux:8 | thunderbird | 0:91.4.0-2.el8_5 | RLSA-2021:5045 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 91.4.0 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-54/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1742579 x_refsource_MISC
- DSA-5034 vendor-advisory, x_refsource_DEBIAN
- [debian-lts-announce] 20220104 [SECURITY] [DLA 2874-1] thunderbird security update mailing-list, x_refsource_MLIST
- GLSA-202208-14 vendor-advisory, x_refsource_GENTOO