CVE-2021-43535: Use After Free
First published: Tue Oct 05 2021(Updated: )
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash.
Credit: security@mozilla.org 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-1 115.4.0esr-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 Thunderbird | <91.3 | 91.3 |
| Mozilla Firefox ESR | <91.3 | 91.3 |
| Mozilla Firefox | <93 | 93 |
| Mozilla Firefox | <93.0 | |
| Mozilla Firefox ESR | <91.3.0 | |
| Mozilla Thunderbird | <91.3.0 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| Debian Debian Linux | =11.0 | |
| <93.0 | ||
| <91.3.0 | ||
| <91.3.0 | ||
| =9.0 | ||
| =10.0 | ||
| =11.0 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667102
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
- https://www.debian.org/security/2021/dsa-5026
- https://www.debian.org/security/2022/dsa-5034
- https://www.mozilla.org/security/advisories/mfsa2021-43/
- https://www.mozilla.org/security/advisories/mfsa2021-49/
- https://www.mozilla.org/security/advisories/mfsa2021-50/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-43535
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-43535
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-43535
- https://security-tracker.debian.org/tracker/CVE-2021-43535
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2021-43535?
CVE-2021-43535 is a vulnerability that could lead to memory corruption and a potentially exploitable crash in Firefox, Thunderbird, and Firefox ESR.
Which software is affected by CVE-2021-43535?
Firefox versions earlier than 93, Thunderbird versions earlier than 91.3, and Firefox ESR versions earlier than 91.3 are affected by CVE-2021-43535.
What is the severity of CVE-2021-43535?
The severity of CVE-2021-43535 is high with a severity value of 7.
How can I fix CVE-2021-43535 in Firefox?
To fix CVE-2021-43535 in Firefox, update your browser to version 93 or later.
How can I fix CVE-2021-43535 in Thunderbird or Firefox ESR?
To fix CVE-2021-43535 in Thunderbird or Firefox ESR, update your software to version 91.3 or later.
- collector/security-tracker-debian
- agent/type
- agent/first-publish-date
- agent/softwarecombine
- collector/mozilla-advisory
- source/Mozilla
- agent/software-canonical-lookup
- agent/references
- agent/severity
- agent/author
- agent/description
- agent/software-canonical-lookup-request
- agent/weakness
- collector/nvd-index
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/tags
- agent/event
- collector/nvd-api
- source/NVD
- package-manager/debian
- vendor/mozilla
- canonical/mozilla thunderbird
- canonical/mozilla firefox esr
- canonical/mozilla firefox
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- version/debian debian linux/11.0