DEBIAN-CVE-2021-40529

Source
https://security-tracker.debian.org/tracker/CVE-2021-40529
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-40529.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2021-40529
Upstream
Published
2021-09-06T19:15:07Z
Modified
2025-09-30T05:15:21.120744Z
Severity
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
[none]
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.

References

Affected packages

Debian:11 / botan

Package

Name
botan
Purl
pkg:deb/debian/botan?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.17.3+dfsg-2
2.17.3+dfsg-3
2.18.1+dfsg-1
2.18.1+dfsg-2
2.18.1+dfsg-3
2.18.2+dfsg-1
2.19.1+dfsg-1
2.19.1+dfsg-2
2.19.1+dfsg-3
2.19.2+dfsg-1
2.19.3+dfsg-1
2.19.4+dfsg-1
2.19.5+dfsg-1
2.19.5+dfsg-2
2.19.5+dfsg-3
2.19.5+dfsg-4

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / botan

Package

Name
botan
Purl
pkg:deb/debian/botan?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.18.1+dfsg-3

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / botan

Package

Name
botan
Purl
pkg:deb/debian/botan?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.18.1+dfsg-3

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:14 / botan

Package

Name
botan
Purl
pkg:deb/debian/botan?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.18.1+dfsg-3

Ecosystem specific

{
    "urgency": "not yet assigned"
}