CVE-2021-23991
medium
CVSS v3
—
CVSS v2
—
VIR risk
5.5
Description
If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-23991
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-23991.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| arch | fixed | 78.9.1-1 | |
| sles | affected | | |
| debian | bookworm | fixed | 1:78.10.0-1 |
| debian | bullseye | fixed | 1:78.10.0-1 |
| debian | forky | fixed | 1:78.10.0-1 |
| debian | sid | fixed | 1:78.10.0-1 |
| debian | trixie | fixed | 1:78.10.0-1 |
References
Verify integrity in audit chain (admin only). AS-IS.