Vulnerability Details : CVE-2021-23979
Potential exploit
Mozilla developers reported memory safety bugs present in Firefox 85. 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.
Vulnerability category: Memory Corruption
Products affected by CVE-2021-23979
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-23979
0.34%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 55 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-23979
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
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-2021-23979
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-23979
-
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1663222%2C1666607%2C1672120%2C1678463%2C1678927%2C1679560%2C1681297%2C1681684%2C1683490%2C1684377%2C1684902
Bug ListExploit;Issue Tracking;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-07/
Security Vulnerabilities fixed in Firefox 86 — MozillaRelease Notes;Vendor Advisory
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