Vulnerability · Published Feb 26, 2021 · Assigned by mozilla
CVE-2021-23974
Medium 6.1
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 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.1Medium
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
The DOMParser API did not properly process '<noscript>' elements for escaping. This could be used as an mXSS vector to bypass an HTML Sanitizer. This vulnerability affects Firefox < 86.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.21 | firefox | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.22 | firefox | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.23 | firefox | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.21 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.22 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.23 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Alpine:v3.24 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23974 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23974 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-07/ x_refsource_MISC
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1528997%2C1683627 x_refsource_MISC
- GLSA-202104-10 vendor-advisory, x_refsource_GENTOO