CVE-2021-29988

high
New! CVE Severity Now Using CVSS v3

The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

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.

References

https://www.mozilla.org/security/advisories/mfsa2021-34/

https://www.mozilla.org/security/advisories/mfsa2021-33/

https://www.mozilla.org/security/advisories/mfsa2021-36/

https://www.mozilla.org/security/advisories/mfsa2021-35/

https://bugzilla.mozilla.org/show_bug.cgi?id=1717922

Details

Source: MITRE

Published: 2021-08-17

Updated: 2021-08-25

Type: CWE-436

Risk Information

CVSS v2

Base Score: 6.8

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Impact Score: 6.4

Exploitability Score: 8.6

Severity: MEDIUM

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Impact Score: 5.9

Exploitability Score: 2.8

Severity: HIGH

Vulnerable Software

Configuration 1

OR

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*

cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*

cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*

Tenable Plugins

View all (47 total)

IDNameProductFamilySeverity
154214openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:1367-1)NessusSuSE Local Security Checks
high
154212SUSE SLES11 Security Update : MozillaFirefox, rust-cbindgen (SUSE-SU-2021:14826-1)NessusSuSE Local Security Checks
high
154193openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:3451-1)NessusSuSE Local Security Checks
high
154182SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2021:3451-1)NessusSuSE Local Security Checks
high
154011openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:3331-1)NessusSuSE Local Security Checks
high
154003SUSE SLES15 Security Update : MozillaFirefox (SUSE-SU-2021:3331-1)NessusSuSE Local Security Checks
high
153840SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2021:14821-1)NessusSuSE Local Security Checks
high
153576SUSE SLED12 / SLES12 Security Update : MozillaFirefox (SUSE-SU-2021:3191-1)NessusSuSE Local Security Checks
high
152589RHEL 8 : firefox (RHSA-2021:3159)NessusRed Hat Local Security Checks
high
153417Amazon Linux 2 : thunderbird (ALAS-2021-1709)NessusAmazon Linux Local Security Checks
high
153132Debian DLA-2745-1 : thunderbird - LTS security updateNessusDebian Local Security Checks
high
152960openSUSE 15 Security Update : MozillaThunderbird (openSUSE-SU-2021:2874-1)NessusSuSE Local Security Checks
high
152953Ubuntu 18.04 LTS / 20.04 LTS / 21.04 : Thunderbird vulnerabilities (USN-5058-1)NessusUbuntu Local Security Checks
high
152920SUSE SLED15 / SLES15 Security Update : MozillaThunderbird (SUSE-SU-2021:2874-1)NessusSuSE Local Security Checks
high
152769openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:1184-1)NessusSuSE Local Security Checks
high
152695openSUSE 15 Security Update : MozillaFirefox (openSUSE-SU-2021:2774-1)NessusSuSE Local Security Checks
high
152690SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2021:2774-1)NessusSuSE Local Security Checks
high
152666CentOS 7 : thunderbird (CESA-2021:3160)NessusCentOS Local Security Checks
high
152663CentOS 7 : firefox (CESA-2021:3154)NessusCentOS Local Security Checks
high
152651SUSE SLES15 Security Update : MozillaFirefox (SUSE-SU-2021:2694-1)NessusSuSE Local Security Checks
high
152649SUSE SLED12 / SLES12 Security Update : MozillaFirefox (SUSE-SU-2021:2691-1)NessusSuSE Local Security Checks
high
152626Oracle Linux 8 : thunderbird (ELSA-2021-3155)NessusOracle Linux Local Security Checks
high
152617Oracle Linux 7 : thunderbird (ELSA-2021-3160)NessusOracle Linux Local Security Checks
high
152616Oracle Linux 7 : firefox (ELSA-2021-3154)NessusOracle Linux Local Security Checks
high
152614Oracle Linux 8 : firefox (ELSA-2021-3157)NessusOracle Linux Local Security Checks
high
152603RHEL 8 : firefox (RHSA-2021:3157)NessusRed Hat Local Security Checks
high
152602RHEL 7 : thunderbird (RHSA-2021:3160)NessusRed Hat Local Security Checks
high
152600RHEL 8 : thunderbird (RHSA-2021:3155)NessusRed Hat Local Security Checks
high
152599RHEL 8 : thunderbird (RHSA-2021:3162)NessusRed Hat Local Security Checks
high
152594CentOS 8 : firefox (CESA-2021:3157)NessusCentOS Local Security Checks
high
152581RHEL 7 : firefox (RHSA-2021:3154)NessusRed Hat Local Security Checks
high
152580RHEL 8 : thunderbird (RHSA-2021:3161)NessusRed Hat Local Security Checks
high
152577RHEL 8 : firefox (RHSA-2021:3156)NessusRed Hat Local Security Checks
high
152576CentOS 8 : thunderbird (CESA-2021:3155)NessusCentOS Local Security Checks
high
152568Debian DSA-4959-1 : thunderbird - security updateNessusDebian Local Security Checks
high
152544SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2021:14782-1)NessusSuSE Local Security Checks
high
152535Debian DLA-2740-1 : firefox-esr - LTS security updateNessusDebian Local Security Checks
high
152516Debian DSA-4956-1 : firefox-esr - security updateNessusDebian Local Security Checks
high
152508Ubuntu 18.04 LTS / 20.04 LTS / 21.04 : Firefox vulnerabilities (USN-5037-1)NessusUbuntu Local Security Checks
high
152504Mozilla Thunderbird < 91.0NessusMacOS X Local Security Checks
high
152503Mozilla Thunderbird < 91.0NessusWindows
high
152453Mozilla Thunderbird < 78.13NessusMacOS X Local Security Checks
high
152452Mozilla Thunderbird < 78.13NessusWindows
high
152415Mozilla Firefox ESR < 78.13NessusMacOS X Local Security Checks
high
152414Mozilla Firefox ESR < 78.13NessusWindows
high
152413Mozilla Firefox < 91.0NessusMacOS X Local Security Checks
high
152412Mozilla Firefox < 91.0NessusWindows
high