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Fencer Intel
high 8.8

CVE-2020-6796 json

A content process could have modified shared memory relating to crash reporting information, crash itself, and cause an out-of-bound write.

published 6y ago modified 4mo ago also EUVD-2020-27943

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

A content process could have modified shared memory relating to crash reporting information, crash itself, and cause an out-of-bound write. This could have caused memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 73 and Firefox < ESR68.5.

Patch / fix

  • Mozilla Firefox 73, ESR68.5
  • firefox-esr Debian 14, Debian 13, Debian 12 68.5.0esr-1

debian advisories DEBIAN-CVE-2020-6796

  • firefox Ubuntu 16.04 LTS 73.0.1+build1-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 73.0+build3-0ubuntu0.18.04.1
  • firefox Ubuntu 20.04 LTS 73.0+build3-0ubuntu1

ubuntu advisories UBUNTU-CVE-2020-6796

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

  • firefox RHEL 6 68.5.0-2.el6_10
  • firefox RHEL 7 68.5.0-2.el7_7
  • firefox RHEL 8 68.5.0-2.el8_1
  • firefox RHEL 8.0 E4S 68.5.0-2.el8_0

red hat advisories RHSA-2020:0519RHSA-2020:0521RHSA-2020:0520RHSA-2020:0512

  • MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES for SAP 12 SP3 +17 more 68.5.0-109.106.1
  • MozillaFirefox SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 68.5.0-3.72.1
  • MozillaFirefox SLES 11 SP4-LTSS 68.5.0-78.61.2

suse advisories SUSE-SU-2020:14290-1SUSE-SU-2020:0384-1SUSE-SU-2020:0383-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaFirefox openSUSE Leap 15.1 68.5.0-lp151.2.30.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2020:0230-1

  • firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +10 more 68.5.0-r0

alpine advisories ALPINE-CVE-2020-6796

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 73.0-1

arch linux advisories AVG-1096

Is CVE-2020-6796 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-6796 updated cvss 8.8

Mozilla: Missing bounds check on shared memory read in the parent process

  • Red Hat Enterprise Linux 5 firefox
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) firefox 68.5.0-2.el8_1
    fixed: vendor fix RHSA-2020:0512
  • Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox 68.5.0-2.el8_0
    fixed: vendor fix RHSA-2020:0519
  • Red Hat Enterprise Linux Client (v. 7) firefox 68.5.0-2.el7_7 Red Hat Enterprise Linux Client Optional (v. 7) firefox 68.5.0-2.el7_7
    fixed: vendor fix RHSA-2020:0520
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 68.5.0-2.el6_10 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 68.5.0-2.el6_10 Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 68.5.0-2.el6_10 Red Hat Enterprise Linux Server (v. 6) firefox 68.5.0-2.el6_10
    fixed: vendor fix RHSA-2020:0521
  • Red Hat Enterprise Linux Server (v. 7) firefox 68.5.0-2.el7_7
    fixed: vendor fix RHSA-2020:0520
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 68.5.0-2.el6_10
    fixed: vendor fix RHSA-2020:0521
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 68.5.0-2.el7_7
    fixed: vendor fix RHSA-2020:0520
show 4 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 68.5.0-2.el6_10
    fixed: vendor fix RHSA-2020:0521
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 68.5.0-2.el7_7
    fixed: vendor fix RHSA-2020:0520
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 68.5.0-2.el6_10
    fixed: vendor fix RHSA-2020:0521
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 68.5.0-2.el7_7
    fixed: vendor fix RHSA-2020:0520

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

1.37% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Mozilla Firefox

Classification

Weakness

References

Sources

Fencer Intel 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.