Vulnerability · Published Jun 24, 2021 · Assigned by mozilla
CVE-2021-29957
Medium 4.3
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 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)4.3Medium
Exploit odds (30 days)0.9%top 38.9% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
If a MIME encoded email contains an OpenPGP inline signed or encrypted message part, but also contains an additional unprotected part, Thunderbird did not indicate that only parts of the message are protected. This vulnerability affects Thunderbird < 78.10.2.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29957 |
| Alpine:v3.21 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29957 |
| Alpine:v3.22 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29957 |
| Alpine:v3.23 | thunderbird | 91.3.2-r0 | ALPINE-CVE-2021-29957 |
| Debian:12 | thunderbird | 1:78.10.2-1 | DEBIAN-CVE-2021-29957 |
| Debian:13 | thunderbird | 1:78.10.2-1 | DEBIAN-CVE-2021-29957 |
| Debian:14 | thunderbird | 1:78.10.2-1 | DEBIAN-CVE-2021-29957 |
| Rocky Linux:8 | thunderbird | 0:78.11.0-1.el8_4 | RLSA-2021:2264 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Thunderbird | unspecified – before 78.10.2 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-22/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1673241 x_refsource_MISC