CVE-2021-40529
medium
CVSS v3
—
CVSS v2
—
VIR risk
5.5
Description
The ElGamal implementation in Botan through 2.18.1, as used in Thunderbird and other products, allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-40529
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 2.18.1+dfsg-3 |
| debian | bullseye | affected | |
| debian | trixie | fixed | 2.18.1+dfsg-3 |
| arch | fixed | 2.18.2-1 |
References
Verify integrity in audit chain (admin only). AS-IS.