CVE-2021-38504: Use After Free

Reference Links

• https://bugzilla.mozilla.org/show_bug.cgi?id=1730156
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/
• 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://security.gentoo.org/glsa/202202-03
• https://security.gentoo.org/glsa/202208-14
• https://www.debian.org/security/2021/dsa-5026
• https://www.debian.org/security/2022/dsa-5034
• https://www.mozilla.org/security/advisories/mfsa2021-48/
• https://www.mozilla.org/security/advisories/mfsa2021-49/
• https://www.mozilla.org/security/advisories/mfsa2021-50/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-48/#CVE-2021-38504
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-38504
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-38504
• https://security-tracker.debian.org/tracker/CVE-2021-38504

Parent vulnerabilities

(Appears in the following advisories)

• MFSA2021-49
• MFSA2021-50
• MFSA2021-48

Peer vulnerabilities

(Found alongside the following vulnerabilities)

• CVE-2021-38503
• CVE-2021-38504
• CVE-2021-38505
• CVE-2021-38506
• CVE-2021-38507
• CVE-2021-43535
• CVE-2021-38508
• CVE-2021-38509
• CVE-2021-38510
• CVE-2021-43534
• CVE-2021-43529
• CVE-2021-43530
• CVE-2021-43531
• CVE-2021-43532
• CVE-2021-43533

Frequently Asked Questions

• What is the severity of CVE-2021-38504?

  The severity of CVE-2021-38504 is high with a CVSS score of 8.8.

• Which software is affected by CVE-2021-38504?

  CVE-2021-38504 affects Firefox versions less than 94, Thunderbird versions less than 91.3, and Firefox ESR versions less than 91.3.

• How can I fix CVE-2021-38504?

  To fix CVE-2021-38504, update to Firefox version 94 or later, Thunderbird version 91.3 or later, or Firefox ESR version 91.3 or later.

• What is the description of CVE-2021-38504?

  CVE-2021-38504 is a vulnerability that could lead to memory corruption and a potentially exploitable crash when interacting with an HTML input element's file picker dialog with webkitdirectory set.

• Where can I find more information about CVE-2021-38504?

  You can find more information about CVE-2021-38504 in the following references: [Bugzilla](https://bugzilla.mozilla.org/show_bug.cgi?id=1730156), [Mozilla Security Advisory](https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/), [Debian LTS Announce](https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html).