CVE-2021-38502

Medium

Description

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

SeverityMedium

CVSS5.9

Exploit probability—

Product

Mozilla Thunderbird

PublishedNov 3, 2021

First seenNov 3, 2021

How to fix

Update

mozilla thunderbird91.2 or later

Vendor advisories

debian.org/security/2022/dsa-5034

Affected products

Product	Affected versions	Fixed in
mozilla thunderbird	v < 91.2	91.2
debian debian_linux	9.0, 10.0, 11.0	—

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