Vulnerability · Published Feb 26, 2021 · Assigned by mozilla
CVE-2021-23956
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 37.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
An ambiguous file picker design could have confused users who intended to select and upload a single file into uploading a whole directory. This was addressed by adding a new prompt. This vulnerability affects Firefox < 85.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.21 | firefox | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.22 | firefox | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.23 | firefox | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.21 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.22 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.23 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Alpine:v3.24 | librewolf | 85.0-r0 | ALPINE-CVE-2021-23956 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23956 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-03/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1338637 x_refsource_MISC