Vulnerability Details : CVE-2021-38496
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.
Vulnerability category: Memory Corruption
Exploit prediction scoring system (EPSS) score for CVE-2021-38496
Probability of exploitation activity in the next 30 days: 0.22%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 60 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-38496
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST |
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST |
CWE ids for CVE-2021-38496
-
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-38496
-
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
[SECURITY] [DLA 2874-1] thunderbird security updateMailing List;Third Party Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-44/
Security Vulnerabilities fixed in Firefox ESR 78.15 — MozillaVendor Advisory
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https://www.mozilla.org/security/advisories/mfsa2021-46/
404: Page Not FoundBroken Link
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https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
Access DeniedIssue Tracking;Permissions Required;Vendor Advisory
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https://www.mozilla.org/security/advisories/mfsa2021-43/
Security Vulnerabilities fixed in Firefox 93 — MozillaVendor Advisory
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https://www.mozilla.org/security/advisories/mfsa2021-47/
Security Vulnerabilities fixed in Thunderbird 91.2 — MozillaVendor Advisory
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https://www.debian.org/security/2022/dsa-5034
Debian -- Security Information -- DSA-5034-1 thunderbirdIssue Tracking;Third Party Advisory
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https://www.mozilla.org/security/advisories/mfsa2021-45/
Security Vulnerabilities fixed in Firefox ESR 91.2 — MozillaVendor Advisory
Products affected by CVE-2021-38496
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*