Vulnerability · Published Feb 26, 2021 · Assigned by mozilla
CVE-2021-23975
Medium 6.5
In plain English
A medium-severity security flaw in Firefox from Mozilla. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.0%top 36.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.21 | firefox | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.22 | firefox | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.23 | firefox | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.21 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.22 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.23 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Alpine:v3.24 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23975 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23975 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-07/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1685145 x_refsource_MISC
- GLSA-202104-10 vendor-advisory, x_refsource_GENTOO