Vulnerability Details : CVE-2020-26959
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Vulnerability category: Memory Corruption
Exploit prediction scoring system (EPSS) score for CVE-2020-26959
Probability of exploitation activity in the next 30 days: 0.31%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 66 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2020-26959
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
[email protected] |
|
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
|
[email protected] |
CWE ids for CVE-2020-26959
-
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.Assigned by: [email protected] (Primary)
References for CVE-2020-26959
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1669466
Issue Tracking;Permissions Required;Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2020-52/
Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2020-51/
Vendor Advisory
-
https://www.mozilla.org/security/advisories/mfsa2020-50/
Vendor Advisory
Products affected by CVE-2020-26959
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*