CVE-2021-23954
First published: Tue Jan 26 2021(Updated: )
Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/firefox | 118.0.2-1 | |
| debian/firefox-esr | 91.12.0esr-1~deb10u1 115.3.1esr-1~deb10u1 102.15.0esr-1~deb11u1 115.3.1esr-1~deb11u1 102.15.1esr-1~deb12u1 115.3.0esr-1~deb12u1 115.3.0esr-1 | |
| debian/thunderbird | 1:91.12.0-1~deb10u1 1:115.3.1-1~deb10u1 1:102.13.1-1~deb11u1 1:115.3.1-1~deb11u1 1:102.15.1-1~deb12u1 1:115.3.1-1~deb12u1 1:115.3.1-1 | |
| Thunderbird | <78.7 | 78.7 |
| Firefox | <85.0 | |
| Firefox ESR | <78.7 | |
| Thunderbird | <78.7 | |
| Firefox | <85 | 85 |
| Firefox ESR | <78.7 | 78.7 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1684020
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/
- https://www.mozilla.org/security/advisories/mfsa2021-03/
- https://www.mozilla.org/security/advisories/mfsa2021-04/
- https://www.mozilla.org/security/advisories/mfsa2021-05/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-04/#CVE-2021-23954
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-03/#CVE-2021-23954
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-05/#CVE-2021-23954
- https://security-tracker.debian.org/tracker/CVE-2021-23954
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-23954?
CVE-2021-23954 is classified as a high severity vulnerability due to potential memory corruption and crash exploitation.
How do I fix CVE-2021-23954?
To fix CVE-2021-23954, update your software to Mozilla Thunderbird version 78.7 or higher, Mozilla Firefox version 85 or higher, or Mozilla Firefox ESR version 78.7 or higher.
What software is affected by CVE-2021-23954?
CVE-2021-23954 affects Mozilla Thunderbird versions up to 78.7, Mozilla Firefox versions up to 85, and Mozilla Firefox ESR versions up to 78.7.
What type of vulnerability is CVE-2021-23954?
CVE-2021-23954 is a type confusion vulnerability that could result in memory corruption.
What can happen if I don't address CVE-2021-23954?
If CVE-2021-23954 is not addressed, it may lead to crashes or potential exploitation of the affected software.
- collector/security-tracker-debian
- agent/first-publish-date
- agent/type
- agent/references
- agent/author
- agent/severity
- agent/weakness
- agent/description
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- agent/trending
- agent/source
- collector/mozilla-advisory
- agent/software-canonical-lookup-request
- source/Mozilla
- agent/software-canonical-lookup
- collector/nvd-index
- agent/tags
- agent/softwarecombine
- package-manager/debian
- vendor/mozilla
- canonical/thunderbird
- canonical/firefox
- canonical/firefox esr