CVE-2021-29988

High

Description

Firefox incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.

SeverityHigh

CVSS8.8

Exploit probability—

Product

Mozilla Firefox

PublishedAug 17, 2021

First seenAug 17, 2021

How to fix

Update

mozilla firefox91.0 or later
mozilla firefox_esr78.13.0 or later
mozilla thunderbird78.13.0 or later

Vendor advisories

security.gentoo.org/glsa/202202-03
security.gentoo.org/glsa/202208-14

Affected products

Product	Affected versions	Fixed in
mozilla firefox	v < 91.0	91.0
mozilla firefox_esr	v < 78.13.0	78.13.0
mozilla thunderbird	v < 78.13.0	78.13.0

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.