Vulnerability Details : CVE-2021-23978
Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Vulnerability category: Memory Corruption
Exploit prediction scoring system (EPSS) score for CVE-2021-23978
Probability of exploitation activity in the next 30 days: 0.49%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 73 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2021-23978
| 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-2021-23978
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-23978
-
https://www.mozilla.org/security/advisories/mfsa2021-08/
Security Vulnerabilities fixed in Firefox ESR 78.8 — MozillaRelease Notes;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-09/
Security Vulnerabilities fixed in Thunderbird 78.8 — MozillaRelease Notes;Vendor Advisory
-
https://security.gentoo.org/glsa/202104-10
Mozilla Firefox: Multiple vulnerabilities (GLSA 202104-10) — Gentoo securityThird Party Advisory
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https://www.mozilla.org/security/advisories/mfsa2021-07/
Security Vulnerabilities fixed in Firefox 86 — MozillaRelease Notes;Vendor Advisory
-
https://security.gentoo.org/glsa/202104-09
Mozilla Thunderbird: Multiple vulnerabilities (GLSA 202104-09) — Gentoo securityThird Party Advisory
-
https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html
[SECURITY] [DLA 2578-1] thunderbird security updateMailing List;Third Party Advisory
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https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C1687597
Bug ListBroken Link;Issue Tracking;Vendor Advisory
-
https://www.debian.org/security/2021/dsa-4866
Debian -- Security Information -- DSA-4866-1 thunderbirdThird Party Advisory
Products affected by CVE-2021-23978
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*