VDB

CVE-2021-23978

CVE-2021-23978 PUBLISHED

Reported by mozilla · Published February 26, 2021

Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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, Thunderbird < 78.8, and Firefox ESR < 78.8.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

PackageEcosystemFixed in
firefoxUbuntu:18.04:LTS86.0+build3-0ubuntu0.18.04.1

Affected products

VendorProductVersions
MozillaFirefox< 86
MozillaThunderbird< 78.8
MozillaFirefox ESR< 78.8
MozillaFirefox ESR0
alpinemozjs780
MozillaThunderbird0
MozillaFirefox0
alpinelibrewolf0
archfirefox0
alpinefirefox-esr0
archthunderbird0
alpinefirefox0
amazon:2thunderbird0
alpinethunderbird0

Timeline

  • Feb 24, 2021 CVE Published
  • Apr 14, 2021 EPSS Score (30 in total, the first dated here)
  • May 24, 2022 CVE Updated
  • Mar 7, 2026 Distribution Patch (3 in total, the first dated here)
  • Mar 7, 2026 Security Advisory (9 in total, the first dated here)
  • Aug 25, 2026 Coalition ESS Score

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2021-23978
vulnetix vdb fixes CVE-2021-23978

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2021-23978/fixes/registry"

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References

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