CVE-2021-38496: Use After Free
First published: Tue Oct 05 2021(Updated: )
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Thunderbird | <91.2 | 91.2 |
| 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-1 115.4.0esr-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 | |
| Mozilla Firefox ESR | <91.2 | 91.2 |
| Mozilla Firefox ESR | <78.15 | 78.15 |
| Mozilla Firefox | <93 | 93 |
| Mozilla Firefox | <93.0 | |
| Mozilla Firefox ESR | <78.15 | |
| Mozilla Firefox ESR | >=91.0<91.2 | |
| Mozilla Thunderbird | <78.15 | |
| Mozilla Thunderbird | >=91.0<91.2 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| Mozilla Firefox | >=91.0<91.2 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-47/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-44/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-45/
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
- https://www.debian.org/security/2022/dsa-5034
- https://www.mozilla.org/security/advisories/mfsa2021-43/
- https://www.mozilla.org/security/advisories/mfsa2021-44/
- https://www.mozilla.org/security/advisories/mfsa2021-45/
- https://www.mozilla.org/security/advisories/mfsa2021-46/
- https://www.mozilla.org/security/advisories/mfsa2021-47/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-38496
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-44/#CVE-2021-38496
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-45/#CVE-2021-38496
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-46/#CVE-2021-38496
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-47/#CVE-2021-38496
- https://security-tracker.debian.org/tracker/CVE-2021-38496
Parent vulnerabilities
(Appears in the following advisories)
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2021-38496?
CVE-2021-38496 is a vulnerability that may result in memory corruption and a potentially exploitable crash in Thunderbird and Firefox.
Which software versions are affected by CVE-2021-38496?
CVE-2021-38496 affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
What is the severity of CVE-2021-38496?
CVE-2021-38496 has a severity rating of 8.8 (high).
How can I fix CVE-2021-38496?
To fix CVE-2021-38496, it is recommended to update Thunderbird and Firefox to the latest available versions.
Where can I find more information about CVE-2021-38496?
You can find more information about CVE-2021-38496 on the Mozilla Bugzilla and Mozilla Security Advisories websites, as well as the Debian LTS Announce mailing list.
- collector/mozilla-advisory
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/severity
- agent/references
- agent/weakness
- source/Mozilla
- agent/software-canonical-lookup
- agent/description
- agent/software-canonical-lookup-request
- collector/nvd-index
- collector/mitre-cve
- source/MITRE
- collector/nvd-api
- source/NVD
- agent/author
- agent/last-modified-date
- agent/softwarecombine
- agent/tags
- agent/event
- vendor/mozilla
- canonical/mozilla thunderbird
- package-manager/debian
- canonical/mozilla firefox esr
- canonical/mozilla firefox
- version/mozilla firefox esr/91.0
- version/mozilla thunderbird/91.0
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- version/debian debian linux/11.0
- version/mozilla firefox/91.0