CVE-2021-23979 — Vulnetix

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CVE-2021-23979 PUBLISHED

Mozilla developers reported memory safety bugs present in Firefox 85. 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 Firefox < 86.

EPSS 0.34% · 56.4th percentile

Risk Scores

EPSS Score

0.34%

56.4th percentile

Affected Products

Vendor	Product	Versions
Ubuntu:18.04:LTS	mozjs52	0, 52.9.1-0ubuntu0.18.04.1, 52.8.1-0ubuntu0.18.04.1
Ubuntu:20.04:LTS	mozjs52	52.9.1-1ubuntu3, 52.9.1-1build1, 0
Ubuntu:22.04:LTS	mozjs78	78.15.0-4ubuntu1, 78.15.0-2, 78.13.0-1
Ubuntu:18.04:LTS	firefox	71.0+build5-0ubuntu0.18.04.1, 0, 56.0+build6-0ubuntu1
Ubuntu:18.04:LTS	mozjs38	38.8.0~repack1-0ubuntu3, 38.8.0~repack1-0ubuntu4, 0
Ubuntu:20.04:LTS	mozjs68	68.5.0-1~fakesync, 68.5.0-2~fakesync, 68.6.0-1
Ubuntu:20.04:LTS	firefox	80.0.1+build1-0ubuntu0.20.04.1, 81.0+build2-0ubuntu0.20.04.1, 81.0.2+build1-0ubuntu0.20.04.1
Ubuntu:16.04:LTS	firefox	52.0.1+build2-0ubuntu0.16.04.1, 52.0.2+build1-0ubuntu0.16.04.1, 53.0+build6-0ubuntu0.16.04.1

Timeline

Feb 26, 2021 CVE Published
Apr 14, 2021 EPSS Score
Jun 22, 2021 EPSS Score
Aug 23, 2021 EPSS Score
Dec 25, 2021 EPSS Score
Jan 6, 2022 EPSS Score
Feb 4, 2022 EPSS Score
Feb 25, 2022 EPSS Score
Apr 1, 2022 EPSS Score
Jun 29, 2022 EPSS Score
Aug 31, 2022 EPSS Score
Nov 1, 2022 EPSS Score

References

https://ubuntu.com/security/CVE-2021-23979 third-party-advisory
https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/#CVE-2021-23979 third-party-advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1663222%2C1666607%2C1672120%2C1678463%2C1678927%2C1679560%2C1681297%2C1681684%2C1683490%2C1684377%2C1684902 third-party-advisory
https://www.mozilla.org/security/advisories/mfsa2021-07/ third-party-advisory
https://ubuntu.com/security/notices/USN-4756-1 vendor-advisory
https://www.cve.org/CVERecord?id=CVE-2021-23979 third-party-advisory

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