Vulnerability · Published Jun 24, 2021 · Assigned by mozilla
CVE-2021-29955
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 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)5.3Medium
Exploit odds (30 days)1.5%top 26.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A transient execution vulnerability, named Floating Point Value Injection (FPVI) allowed an attacker to leak arbitrary memory addresses and may have also enabled JIT type confusion attacks. (A related vulnerability, Speculative Code Store Bypass (SCSB), did not affect Firefox.). This vulnerability affects Firefox ESR < 78.9 and Firefox < 87.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | firefox-esr | 78.9.0esr-1 | DEBIAN-CVE-2021-29955 |
| Debian:13 | firefox-esr | 78.9.0esr-1 | DEBIAN-CVE-2021-29955 |
| Debian:14 | firefox-esr | 78.9.0esr-1 | DEBIAN-CVE-2021-29955 |
| Ubuntu:22.04:LTS | mozjs78 | no fix listed | UBUNTU-CVE-2021-29955 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox ESR | unspecified – before 78.9 |
| Mozilla | Firefox | unspecified – before 87 |
References
- https://www.mozilla.org/security/advisories/mfsa2021-10/ x_refsource_MISC
- https://www.mozilla.org/security/advisories/mfsa2021-11/ x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1692972 x_refsource_MISC