CVE-2021-29969

Medium

Description

If Thunderbird was configured to use STARTTLS for an IMAP connection, and an attacker injected IMAP server responses prior to the completion of the STARTTLS handshake, then Thunderbird didn't ignore the injected data. This could have resulted in Thunderbird showing incorrect information, for example the attacker could have tricked Thunderbird to show folders that didn't exist on the IMAP server. This vulnerability affects Thunderbird < 78.12.

SeverityMedium

CVSS5.9

Exploit probability—

Product

Mozilla Thunderbird

PublishedAug 5, 2021

First seenAug 5, 2021

How to fix

Update

mozilla thunderbird78.12 or later

Vendor advisories

security.gentoo.org/glsa/202208-14

Affected products

Product	Affected versions	Fixed in
mozilla thunderbird	v < 78.12	78.12

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