CyberRota Analysis
This is a medium severity vulnerability with a CVSS score of 6.8. See the original NVD description below for full technical details.
CVE
CVE-2021-23991
Severity
MEDIUM
CVSS
6.8
EPSS
1.03%
Original NVD 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.
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