Vulnerability · Published Jun 24, 2021 · Assigned by mozilla
CVE-2021-29952
High 7.5
In plain English
A high-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 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)0.7%top 45.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
When Web Render components were destructed, a race condition could have caused undefined behavior, and we presume that with enough effort may have been exploitable to run arbitrary code. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.21 | firefox | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.22 | firefox | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.23 | firefox | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.21 | librewolf | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.22 | librewolf | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.23 | librewolf | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Alpine:v3.24 | librewolf | 88.0.1-r0 | ALPINE-CVE-2021-29952 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-29952 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | unspecified – before 88.0.1 |
| Mozilla | Firefox for Android | unspecified – before 88.1.3 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-20/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1704227 x_refsource_MISC