{"id":"CVE-2021-40529","details":"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.","modified":"2026-04-16T04:37:53.992365257Z","published":"2021-09-06T19:15:07.630Z","related":["SUSE-SU-2021:4150-1","openSUSE-SU-2021:1635-1","openSUSE-SU-2021:4150-1","openSUSE-SU-2024:11661-1","openSUSE-SU-2024:11670-1"],"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/72NB4OLD3VHJC3YF3PEP2HKF6BYURPAO/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPHGYWNJQKWLTUWBNSFB4F66MQDIL3IB/"},{"type":"ADVISORY","url":"https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-14"},{"type":"ADVISORY","url":"https://eprint.iacr.org/2021/923"},{"type":"FIX","url":"https://github.com/randombit/botan/pull/2790"},{"type":"EVIDENCE","url":"https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/randombit/botan","events":[{"introduced":"0"},{"last_affected":"d4bd416702a65eddcc14ee06b9c1b674631e6ae3"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"2.18.1"}]}}],"versions":["1.10.0","1.10.0-rc1","1.10.1","1.11.0","1.11.10","1.11.11","1.11.12","1.11.13","1.11.14","1.11.15","1.11.16","1.11.17","1.11.18","1.11.19","1.11.2","1.11.20","1.11.21","1.11.22","1.11.23","1.11.24","1.11.25","1.11.26","1.11.27","1.11.28","1.11.29","1.11.3","1.11.30","1.11.31","1.11.32","1.11.33","1.11.34","1.11.5","1.11.6","1.11.7","1.11.8","1.11.9","1.5.10","1.5.11","1.5.12","1.5.13","1.5.6","1.5.7","1.5.8","1.5.9","1.6.0","1.6.1","1.7.0","1.7.1","1.7.10","1.7.11","1.7.15","1.7.16","1.7.17","1.7.18","1.7.19","1.7.20","1.7.21","1.7.22","1.7.23","1.7.24","1.7.3","1.7.4","1.7.5","1.7.6","1.7.7","1.7.8","1.7.9","1.8.2","1.8.3","1.8.4","1.8.5","1.8.6","1.8.7","1.8.8","1.9.10","1.9.11","1.9.12","1.9.13","1.9.14","1.9.15","1.9.16","1.9.17","1.9.18","1.9.3","1.9.4","1.9.5","1.9.6","1.9.7","1.9.8","1.9.9","2.0.0","2.0.1","2.1.0","2.10.0","2.11.0","2.12.0","2.12.1","2.13.0","2.14.0","2.15.0","2.16.0","2.17.0","2.17.1","2.17.2","2.17.3","2.18.0","2.18.1","2.2.0","2.3.0","2.4.0","2.5.0","2.6.0","2.7.0","2.8.0","2.9.0"],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"34"}]},{"events":[{"introduced":"0"},{"last_affected":"35"}]},{"events":[{"introduced":"0"},{"fixed":"91.12.0"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-40529.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}