Vulnerability · Published Feb 26, 2021 · Assigned by mozilla
CVE-2021-23977
Medium 5.3
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 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)0.9%top 40.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious application to read sensitive data from application directories. Note: This issue is only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 86.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.20 | firefox | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.21 | firefox | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.22 | firefox | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.23 | firefox | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.21 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.22 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.23 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Alpine:v3.24 | librewolf | 87.0-r0 | ALPINE-CVE-2021-23977 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-23977 |
Affected products (as reported)
References
- https://www.mozilla.org/security/advisories/mfsa2021-07/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1684761 x_refsource_MISC
- GLSA-202104-10 vendor-advisory, x_refsource_GENTOO