CVE-2021-29970: Use After Free
First published: Tue Jul 13 2021(Updated: )
A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
Credit: security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mozilla Firefox ESR | <78.12 | 78.12 |
| 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 | |
| Mozilla Firefox | <90.0 | |
| Mozilla Firefox ESR | <78.12 | |
| Mozilla Thunderbird | <78.12 | |
| <78.12 | 78.12 | |
| <78.12 | 78.12 | |
| <90 | 90 |
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Reference Links
- https://bugzilla.mozilla.org/show_bug.cgi?id=1709976
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-29/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/
- https://security.gentoo.org/glsa/202202-03
- https://security.gentoo.org/glsa/202208-14
- https://www.mozilla.org/security/advisories/mfsa2021-28/
- https://www.mozilla.org/security/advisories/mfsa2021-29/
- https://www.mozilla.org/security/advisories/mfsa2021-30/
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29970
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-29/#CVE-2021-29970
- https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/#CVE-2021-29970
- https://security-tracker.debian.org/tracker/CVE-2021-29970
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is CVE-2021-29970?
CVE-2021-29970 is a vulnerability that could allow a malicious webpage to trigger a use-after-free memory corruption and a potentially exploitable crash.
Which software is affected by CVE-2021-29970?
Firefox ESR 78.12, Thunderbird 78.12, and Firefox up to version 90 are affected by CVE-2021-29970.
What is the severity of CVE-2021-29970?
CVE-2021-29970 has a severity rating of high.
How can I fix CVE-2021-29970?
To fix CVE-2021-29970, update your Firefox ESR to version 78.12, Thunderbird to version 78.12, or Firefox to a version beyond 90.
Where can I find more information about CVE-2021-29970?
You can find more information about CVE-2021-29970 in the following references: [Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1709976), [Mozilla Security Advisory](https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/), [Mozilla Security Advisory](https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/).
- collector/mozilla-advisory
- collector/security-tracker-debian
- agent/type
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- source/Mozilla
- agent/software-canonical-lookup
- agent/references
- agent/severity
- agent/weakness
- agent/author
- agent/event
- agent/software-canonical-lookup-request
- agent/description
- agent/tags
- collector/nvd-index
- collector/mitre-cve
- source/MITRE
- vendor/mozilla
- canonical/mozilla firefox esr
- package-manager/debian
- canonical/mozilla thunderbird
- canonical/mozilla firefox