CVE-2020-6819

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

Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

References

https://www.mozilla.org/security/advisories/mfsa2020-14/

https://www.mozilla.org/security/advisories/mfsa2020-11/

https://bugzilla.mozilla.org/show_bug.cgi?id=1620818

https://usn.ubuntu.com/4335-1/

Details

Source: MITRE

Published: 2020-04-24

Updated: 2021-07-21

Type: CWE-416

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: 8.1

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

Impact Score: 5.9

Exploitability Score: 2.2

Severity: HIGH

Tenable Plugins

View all (52 total)

IDNameProductFamilySeverity
150588SUSE SLES11 Security Update : MozillaFirefox (SUSE-SU-2020:14337-1)NessusSuSE Local Security Checks
high
147407NewStart CGSL MAIN 4.06 : firefox Multiple Vulnerabilities (NS-SA-2021-0004)NessusNewStart CGSL Local Security Checks
critical
147312NewStart CGSL MAIN 4.06 : thunderbird Multiple Vulnerabilities (NS-SA-2021-0002)NessusNewStart CGSL Local Security Checks
critical
145858CentOS 8 : thunderbird (CESA-2020:1495)NessusCentOS Local Security Checks
critical
143979NewStart CGSL CORE 5.05 / MAIN 5.05 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0093)NessusNewStart CGSL Local Security Checks
critical
143948NewStart CGSL CORE 5.05 / MAIN 5.05 : firefox Multiple Vulnerabilities (NS-SA-2020-0097)NessusNewStart CGSL Local Security Checks
critical
143928NewStart CGSL CORE 5.04 / MAIN 5.04 : firefox Multiple Vulnerabilities (NS-SA-2020-0064)NessusNewStart CGSL Local Security Checks
critical
143912NewStart CGSL CORE 5.04 / MAIN 5.04 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0074)NessusNewStart CGSL Local Security Checks
critical
140283NewStart CGSL MAIN 4.05 : firefox Multiple Vulnerabilities (NS-SA-2020-0047)NessusNewStart CGSL Local Security Checks
critical
138776NewStart CGSL MAIN 6.01 : thunderbird Multiple Vulnerabilities (NS-SA-2020-0036)NessusNewStart CGSL Local Security Checks
critical
136752Amazon Linux 2 : thunderbird (ALAS-2020-1429)NessusAmazon Linux Local Security Checks
critical
136194CentOS 7 : thunderbird (CESA-2020:1489)NessusCentOS Local Security Checks
critical
136017CentOS 6 : thunderbird (CESA-2020:1488)NessusCentOS Local Security Checks
critical
136007openSUSE Security Update : MozillaThunderbird (openSUSE-2020-544)NessusSuSE Local Security Checks
critical
701275Mozilla Firefox < 74.0.1 Race ConditionNessus Network MonitorWeb Clients
high
701273Mozilla Firefox ESR < 68.6.1 Race ConditionNessus Network MonitorWeb Clients
high
135896Ubuntu 16.04 LTS : Thunderbird vulnerabilities (USN-4335-1)NessusUbuntu Local Security Checks
critical
135845Scientific Linux Security Update : thunderbird on SL7.x x86_64 (20200416)NessusScientific Linux Local Security Checks
critical
135810Scientific Linux Security Update : firefox on SL7.x x86_64 (20200407)NessusScientific Linux Local Security Checks
high
135747Oracle Linux 8 : thunderbird (ELSA-2020-1495)NessusOracle Linux Local Security Checks
critical
135716Scientific Linux Security Update : thunderbird on SL6.x i386/x86_64 (20200416)NessusScientific Linux Local Security Checks
critical
135715Oracle Linux 7 : thunderbird (ELSA-2020-1489)NessusOracle Linux Local Security Checks
critical
135692RHEL 8 : thunderbird (RHSA-2020:1495)NessusRed Hat Local Security Checks
critical
135691RHEL 8 : thunderbird (RHSA-2020:1496)NessusRed Hat Local Security Checks
critical
135687RHEL 6 : thunderbird (RHSA-2020:1488)NessusRed Hat Local Security Checks
critical
135684RHEL 7 : thunderbird (RHSA-2020:1489)NessusRed Hat Local Security Checks
critical
135578openSUSE Security Update : MozillaThunderbird (openSUSE-2020-520)NessusSuSE Local Security Checks
critical
135495Debian DLA-2172-1 : thunderbird security updateNessusDebian Local Security Checks
critical
135455Ubuntu 18.04 LTS / 19.10 : Thunderbird vulnerabilities (USN-4328-1)NessusUbuntu Local Security Checks
critical
135430Oracle Linux 7 : firefox (ELSA-2020-1338)NessusOracle Linux Local Security Checks
high
135417Debian DSA-4656-1 : thunderbird - security updateNessusDebian Local Security Checks
critical
135413Mozilla Thunderbird < 68.7.0NessusWindows
critical
135412Mozilla Thunderbird < 68.7.0NessusMacOS X Local Security Checks
critical
135377Oracle Linux 8 : firefox (ELSA-2020-1341)NessusOracle Linux Local Security Checks
high
135363Debian DLA-2170-1 : firefox-esr security updateNessusDebian Local Security Checks
critical
135361CentOS 6 : firefox (CESA-2020:1339)NessusCentOS Local Security Checks
high
135278Scientific Linux Security Update : firefox on SL6.x i386/x86_64 (20200407)NessusScientific Linux Local Security Checks
high
135267SUSE SLED15 / SLES15 Security Update : MozillaFirefox (SUSE-SU-2020:0929-1)NessusSuSE Local Security Checks
high
135266SUSE SLES12 Security Update : MozillaFirefox (SUSE-SU-2020:0928-1)NessusSuSE Local Security Checks
high
135263openSUSE Security Update : MozillaFirefox (openSUSE-2020-461)NessusSuSE Local Security Checks
high
135254RHEL 8 : firefox (RHSA-2020:1341)NessusRed Hat Local Security Checks
high
135242RHEL 7 : firefox (RHSA-2020:1338)NessusRed Hat Local Security Checks
high
135241RHEL 8 : firefox (RHSA-2020:1340)NessusRed Hat Local Security Checks
high
135240RHEL 6 : firefox (RHSA-2020:1339)NessusRed Hat Local Security Checks
high
135229Ubuntu 16.04 LTS / 18.04 LTS / 19.10 : firefox vulnerabilities (USN-4317-1)NessusUbuntu Local Security Checks
high
135219Slackware 14.2 / current : mozilla-firefox (SSA:2020-094-01)NessusSlackware Local Security Checks
high
135216GLSA-202004-07 : Mozilla Firefox: Multiple vulnerabilitiesNessusGentoo Local Security Checks
high
135208Debian DSA-4653-1 : firefox-esr - security updateNessusDebian Local Security Checks
high
135202Mozilla Firefox < 74.0.1NessusWindows
high
135201Mozilla Firefox ESR < 68.6.1NessusWindows
high
135200Mozilla Firefox < 74.0.1NessusMacOS X Local Security Checks
high
135199Mozilla Firefox ESR < 68.6.1NessusMacOS X Local Security Checks
high