Vulnerability · Published Feb 26, 2021 · Assigned by mozilla
CVE-2021-23971
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 36.8% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
When processing a redirect with a conflicting Referrer-Policy, Firefox would have adopted the redirect's Referrer-Policy. This would have potentially resulted in more information than intended by the original origin being provided to the destination of the redirect. This vulnerability affects Firefox < 86.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.21 | firefox | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.22 | firefox | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.23 | firefox | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.21 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.22 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.23 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Alpine:v3.24 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23971 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23971 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-07/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1678545 x_refsource_MISC
- GLSA-202104-10 vendor-advisory, x_refsource_GENTOO