CVE-2021-23987

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2021-23987
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-03-31 14:15:00 UTC
Updated2022-05-03 16:04:00 UTC
DescriptionMozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. 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 ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

Risk And Classification

Problem Types: CWE-787

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mozilla Firefox All All All All
Application Mozilla Firefox Esr All All All All
Application Mozilla Thunderbird All All All All

References

ReferenceSourceLinkTags
Mozilla Firefox: Multiple vulnerabilities (GLSA 202104-10) — Gentoo security GENTOO security.gentoo.org
Security Vulnerabilities fixed in Thunderbird 78.9 — Mozilla MISC www.mozilla.org
Mozilla Thunderbird: Multiple vulnerabilities (GLSA 202104-09) — Gentoo security GENTOO security.gentoo.org
Security Vulnerabilities fixed in Firefox 87 — Mozilla MISC www.mozilla.org
Security Vulnerabilities fixed in Firefox ESR 78.9 — Mozilla MISC www.mozilla.org
Bug List MISC bugzilla.mozilla.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159123 Oracle Enterprise Linux Security Update for firefox (ELSA-2021-0990)
  • 159124 Oracle Enterprise Linux Security Update for firefox (ELSA-2021-0992)
  • 159125 Oracle Enterprise Linux Security Update for thunderbird (ELSA-2021-0993)
  • 159126 Oracle Enterprise Linux Security Update for thunderbird (ELSA-2021-0996)
  • 174866 SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:0966-1)
  • 174909 SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:0999-1)
  • 174913 SUSE Enterprise Linux Security Update for MozillaFirefox (SUSE-SU-2021:1007-1)
  • 178504 Debian Security Update for firefox-esr (DLA 2607-1)
  • 178506 Debian Security Update for thunderbird (DLA 2609-1)
  • 178514 Debian Security Update for thunderbird (DSA 4876-1)
  • 178521 Debian Security Update for firefox-esr (DSA 4874-1)
  • 180125 Debian Security Update for thunderbirdfirefox-esr (CVE-2021-23987)
  • 198311 Ubuntu Security Notification for Firefox Vulnerabilities (USN-4893-1)
  • 198415 Ubuntu Security Notification for Thunderbird vulnerabilities (USN-4995-1)
  • 198424 Ubuntu Security Notification for Thunderbird vulnerabilities (USN-4995-2)
  • 239187 Red Hat Update for thunderbird (RHSA-2021:0996)
  • 239188 Red Hat Update for thunderbird (RHSA-2021:0995)
  • 239189 Red Hat Update for thunderbird (RHSA-2021:0994)
  • 239190 Red Hat Update for thunderbird (RHSA-2021:0993)
  • 239191 Red Hat Update for firefox (RHSA-2021:0992)
  • 239192 Red Hat Update for firefox (RHSA-2021:0991)
  • 239193 Red Hat Update for firefox (RHSA-2021:0990)
  • 239194 Red Hat Update for firefox (RHSA-2021:0989)
  • 257071 CentOS Security Update for firefox (CESA-2021:0992)
  • 257072 CentOS Security Update for thunderbird (CESA-2021:0996)
  • 352266 Amazon Linux Security Advisory for thunderbird: ALAS2-2021-1632
  • 375408 Mozilla Firefox Multiple Vulnerabilities (MFSA2021-10)
  • 375409 Mozilla Firefox ESR Multiple Vulnerabilities (MFSA2021-11)
  • 375412 Mozilla Thunderbird Multiple Vulnerabilities (MFSA2021-12)
  • 500942 Alpine Linux Security Update for firefox-esr
  • 501555 Alpine Linux Security Update for firefox
  • 501625 Alpine Linux Security Update for mozjs78
  • 502379 Alpine Linux Security Update for thunderbird
  • 503846 Alpine Linux Security Update for firefox
  • 630668 Mozilla Firefox for Android and iOS Multiple Vulnerabilities (MFSA2021-10)
  • 710019 Gentoo Linux Mozilla Thunderbird Multiple Vulnerabilities (GLSA 202104-09)
  • 710020 Gentoo Linux Mozilla Firefox Multiple Vulnerabilities (GLSA 202104-10)
  • 750260 OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:0580-1)
  • 750288 OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:0487-1)
  • 940138 AlmaLinux Security Update for thunderbird (ALSA-2021:0993)
  • 940159 AlmaLinux Security Update for firefox (ALSA-2021:0990)
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

CVE.report and Source URL Uptime Status status.cve.report