5.9

CVE-2021-40529

Exploit

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.

Data is provided by the National Vulnerability Database (NVD)
Botan Project ≫ Botan Version <= 2.18.1
Fedoraproject ≫ Fedora Version34
Fedoraproject ≫ Fedora Version35
Mozilla ≫ Thunderbird Version < 91.12.0
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.28% 0.511
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 5.9 2.2 3.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
nvd@nist.gov 2.6 4.9 2.9
AV:N/AC:H/Au:N/C:P/I:N/A:N
CWE-327 Use of a Broken or Risky Cryptographic Algorithm

The product uses a broken or risky cryptographic algorithm or protocol.

https://eprint.iacr.org/2021/923
Third Party Advisory
Technical Description