CVE-2021-23991 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Reference

https://www.mozilla.org/security/advisories/mfsa2021-13/ https://bugzilla.mozilla.org/show_bug.cgi?id=1673240

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

NONE

Base Severity

6.8