CVEvulnerability

CVE-2021-23991

6.8 MEDIUM Published 2021-06-24 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-06-24
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS 2.0 ([email protected])
4.0 MEDIUM — AV:N/AC:H/Au:N/C:P/I:P/A:N

Description

If a Thunderbird user has previously imported Alice's OpenPGP key, and Alice has extended the validity period of her key, but Alice's updated key has not yet been imported, an attacker may send an email containing a crafted version of Alice's key with an invalid subkey, Thunderbird might subsequently attempt to use the invalid subkey, and will fail to send encrypted email to Alice. This vulnerability affects Thunderbird < 78.9.1.

Affected configurations

• mozilla thunderbird (< 78.9.1)

References