Vulnerability · Published Jun 24, 2021 · Assigned by mozilla
CVE-2021-23997
High 8.8
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 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)8.8High
Exploit odds (30 days)0.8%top 42.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 88.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.21 | firefox | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.22 | firefox | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.23 | firefox | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.21 | librewolf | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.22 | librewolf | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.23 | librewolf | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Alpine:v3.24 | librewolf | 88.0-r0 | ALPINE-CVE-2021-23997 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23997 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-16/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1701942 x_refsource_MISC