CVE-2021-29969
thunderbird - security update
5.9
MEDIUM
CVSS 3.1
EPSS 0.30%
Description
If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses prior to the completion of the STARTTLS handshake, then Thunderbird didn't ignore the injected data. This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didn't exist on the IMAP server. This vulnerability affects Thunderbird < 78.12.
How to fix CVE-2021-29969
To remediate CVE-2021-29969, upgrade the affected package to a fixed version below.
- —upgrade to 1:78.12.0-1 or later
- —upgrade to 1:78.12.0-1~deb9u1 or later
- —upgrade to 1:78.12.0-1~deb10u1 or later
Is CVE-2021-29969 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0, < 1:78.12.0-1
- from 0, < 1:78.12.0-1~deb9u1
- from 0, < 1:78.12.0-1~deb10u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |