CVE-2021-23993
medium
CVSS v3
—
CVSS v2
—
VIR risk
5.5
Description
An attacker may perform a DoS attack to prevent a user from sending encrypted email to a correspondent. If an attacker creates a crafted OpenPGP key with a subkey that has an invalid self signature, and the Thunderbird user imports the crafted key, then Thunderbird may try to use the invalid subkey, but the RNP library rejects it from being used, causing encryption to fail. 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-2021-23993
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-23993.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.