Medium severity · published Jun 24, 2021
CVE-2021-29955
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…
5.3
CVSS
1.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.5% · higher than 74% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 87.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.9 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29955
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-29955
Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1692972
Release Notes
https://www.mozilla.org/security/advisories/mfsa2021-10/
Release Notes
https://www.mozilla.org/security/advisories/mfsa2021-11/
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