Cryptographic issues in Mozilla Thunderbird - CVE-2021-23991
Published: April 8, 2021
Vulnerability identifier: #VU52002
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-23991
CWE-ID: CWE-310
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Mozilla Thunderbird
Mozilla Thunderbird
Software vendor:
Mozilla
Mozilla
Description
The vulnerability allows a remote attacker to email encryption.
The vulnerability exists in the way Thunderbird uses the OpenPGP key refresh mechanism while handling the extended validity key period. A remote attacker can send victim an email containing a crafted version of the original key and an invalid subkey and force the application to use the invalid subkey, which will result in failure to encrypt the original email message when sending it.
Remediation
Install updates from vendor's website.