CVE-2021-23991 — Improper Verification of Cryptographic Signature in Mozilla Thunderbird
Severity
6.8MEDIUMNVD
OSV7.4
EPSS
0.2%
top 57.43%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJun 24
Latest updateMay 24
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:NExploitability: 1.6 | Impact: 5.2
Affected Packages6 packages
🔴Vulnerability Details
4GHSA▶
GHSA-x5j6-p8w8-5r65: 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↗2022-05-24
OSV▶
CVE-2021-23991: 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↗2021-06-24