Home/CVE/During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corrup
CVE

CVE-2021-38496

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corrup

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

HIGH · CVSS 8.8 EPSS 0.0109
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
▤

Affected Products & Versions

6
mozilla firefox< 93.0
mozilla firefox>= 91.0 and < 91.2
mozilla firefox esr< 78.15
mozilla thunderbird< 78.15
mozilla thunderbird>= 91.0 and < 91.2
debian linuxall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSQLite Firefox Profile Data DB Access
▣

Scoring & Timeline

8.8
HIGH · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Nov 2021 · 01:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
⚑

Vendor Advisories

25
suse-csafopenSUSE-SU-2024:14572-1
suse-csafopenSUSE-SU-2024:11570-1
suse-csafopenSUSE-SU-2024:11571-1
usnUSN-5248-1
suse-csafopenSUSE-SU-2021:1635-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.mozilla.org/show_bug.cgi?id=1725335Issue TrackingPermissions RequiredVendor Advisory
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing ListThird Party Advisory
https://www.debian.org/security/2022/dsa-5034Issue TrackingThird Party Advisory
https://www.mozilla.org/security/advisories/mfsa2021-43/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-44/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2021-45/Vendor Advisory
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