CVE-2020-6825 json
Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR…
published 2020-04-24 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27969
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
Summary
Mozilla developers and community members Tyson Smith and Christian Holler reported memory safety bugs present in Firefox 74 and Firefox ESR 68.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
Patch / fix
- Mozilla Thunderbird 68.7.0
- Mozilla Firefox ESR 68.7
- Mozilla Firefox 75
- firefox-esr Debian 14, Debian 13, Debian 12 68.7.0esr-1
- thunderbird Debian 14, Debian 13, Debian 12 1:68.7.0-1
debian advisories DEBIAN-CVE-2020-6825
- firefox Ubuntu 16.04 LTS 75.0+build3-0ubuntu0.16.04.1
- firefox Ubuntu 18.04 LTS 75.0+build3-0ubuntu0.18.04.1
- firefox Ubuntu 20.04 LTS 75.0+build3-0ubuntu1
- thunderbird Ubuntu 16.04 LTS 1:68.7.0+build1-0ubuntu0.16.04.2
- thunderbird Ubuntu 18.04 LTS 1:68.7.0+build1-0ubuntu0.18.04.1
- thunderbird Ubuntu 20.04 LTS 1:68.7.0+build1-0ubuntu1
ubuntu advisories UBUNTU-CVE-2020-6825
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- thunderbird RHEL 8 68.7.0-1.el8_1
- thunderbird RHEL 7 68.7.0-1.el7_8
- thunderbird RHEL 6 68.7.0-1.el6_10
- firefox RHEL 6 68.7.0-2.el6_10
- firefox RHEL 7 68.7.0-2.el7_8
- firefox RHEL 8 68.7.0-2.el8_1
- thunderbird RHEL 8.0 E4S 68.7.0-1.el8_0
- firefox RHEL 8.0 E4S 68.7.0-2.el8_0
red hat advisories RHSA-2020:1495RHSA-2020:1496RHSA-2020:1489RHSA-2020:1488RHSA-2020:1429RHSA-2020:1420
- MozillaThunderbird SLE Workstation Extension 15 SP1 68.7.0-3.77.1
- MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +16 more 68.7.0-109.116.1
- MozillaFirefox SLE Module for Desktop Applications 15 SP1 68.7.0-3.84.2
- MozillaFirefox SLES 11 SP4-LTSS 68.7.0-78.70.1
suse advisories SUSE-SU-2020:1027-1SUSE-SU-2020:0978-1SUSE-SU-2020:14339-1SUSE-SU-2020:0971-1
- firefox-esr openSUSE Tumbleweed 128.5.1-1.1
- MozillaFirefox openSUSE Tumbleweed 92.0-1.2
- MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
- MozillaThunderbird openSUSE Leap 15.1 68.7.0-lp151.2.35.1
- MozillaThunderbird openSUSE Leap 15.1 68.7.0-lp151.2.31.1
- MozillaFirefox openSUSE Leap 15.1 68.7.0-lp151.2.42.1
opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2020:0544-1openSUSE-SU-2020:0520-1openSUSE-SU-2020:0493-1
- firefox Alpine 3.23, Alpine 3.22, Alpine 3.21 +9 more 75.0-r0
- mozjs68 Alpine 3.12 68.7.0-r0
- librewolf Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 75.0-r0
- firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +10 more 68.7.0-r0
- thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +5 more 68.7.0-r0
alpine advisories ALPINE-CVE-2020-6825
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- firefox Arch Linux 75.0-1
arch linux advisories AVG-1127
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-6825 updated cvss 9.8
Mozilla: Memory safety bugs fixed in Firefox 75 and Firefox ESR 68.7
-
Red Hat Enterprise Linux 5 firefox, thunderbirdaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) firefox 68.7.0-2.el8_1, thunderbird 68.7.0-1.el8_1fixed: vendor fix RHSA-2020:1406
-
Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 68.7.0-2.el8_0, thunderbird 68.7.0-1.el8_0fixed: vendor fix RHSA-2020:1404
-
Red Hat Enterprise Linux Client (v. 7) firefox 68.7.0-2.el7_8, thunderbird 68.7.0-1.el7_8 Red Hat Enterprise Linux Client Optional (v. 7) firefox 68.7.0-2.el7_8fixed: vendor fix RHSA-2020:1420
-
Red Hat Enterprise Linux Desktop (v. 6) firefox 68.7.0-2.el6_10, thunderbird 68.7.0-1.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 68.7.0-2.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 68.7.0-2.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 68.7.0-2.el6_10fixed: vendor fix RHSA-2020:1429
-
Red Hat Enterprise Linux Server (v. 7) firefox 68.7.0-2.el7_8fixed: vendor fix RHSA-2020:1420
-
Red Hat Enterprise Linux Server Optional (v. 6) firefox 68.7.0-2.el6_10, thunderbird 68.7.0-1.el6_10fixed: vendor fix RHSA-2020:1429
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Red Hat Enterprise Linux Server Optional (v. 7) firefox 68.7.0-2.el7_8, thunderbird 68.7.0-1.el7_8fixed: vendor fix RHSA-2020:1420
show 4 moreshow fewer
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Red Hat Enterprise Linux Workstation (v. 6) firefox 68.7.0-2.el6_10, thunderbird 68.7.0-1.el6_10fixed: vendor fix RHSA-2020:1429
-
Red Hat Enterprise Linux Workstation (v. 7) firefox 68.7.0-2.el7_8, thunderbird 68.7.0-1.el7_8fixed: vendor fix RHSA-2020:1420
-
Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 68.7.0-2.el6_10fixed: vendor fix RHSA-2020:1429
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Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 68.7.0-2.el7_8fixed: vendor fix RHSA-2020:1420
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
2.19% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Mozilla Thunderbird
- Mozilla Firefox ESR
- Mozilla Firefox
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
usn.ubuntu.com
/4335-1/
vendor-advisory, third-party-advisory
-
mozilla.org
/security/advisories/mfsa2020-13/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2020-12/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2020-14/
vendor-advisory
-
bugzilla.mozilla.org
/buglist.cgi?bug_id=1572541%2C1620193%2C1620203
issue-tracking, permissions-required
Sources
- CVE List CVE-2020-6825
- NVD CVE-2020-6825
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.