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CVE-2021-23991

Public on 2021-05-20
Modified on 2021-05-24
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.

Severity
Medium
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CVSS v3 Base Score
6.8
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 2 - Core thunderbird 2021-05-20 17:05 ALAS2-2021-1644

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD CVSSv2 4.0 AV:N/AC:H/Au:N/C:P/I:P/A:N
NVD CVSSv3 6.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

References

Red Hat: CVE-2021-23991 Mitre: CVE-2021-23991 FAQs regarding Amazon Linux ALAS/CVE Severity