CVE-2021-40529
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Botan
PublishedSep 6, 2021
First seenSep 6, 2021
How to fix
Update
- mozilla thunderbird91.12.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| botan_project botan | v ≤ 2.18.1 | — |
| fedoraproject fedora | 34, 35 | — |
| mozilla thunderbird | v < 91.12.0 | 91.12.0 |
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