Medium severity · published Jun 24, 2021
CVE-2021-29945
The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash
6.5
CVSS
1.2%
EPSS
No
On KEV
Description
The WebAssembly JIT could miscalculate the size of a return type, which could lead to a null read and result in a crash. *Note: This issue only affected x86-32 platforms. Other platforms are unaffected.*. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 68% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 88.0 · source: NVD
FE
Firefox Esr · Mozilla
before 78.10 · source: NVD
TH
Thunderbird · Mozilla
before 78.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-29945
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-29945
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1700690
Release Notes
https://www.mozilla.org/security/advisories/mfsa2021-14/
Release Notes
https://www.mozilla.org/security/advisories/mfsa2021-15/
Release Notes
https://www.mozilla.org/security/advisories/mfsa2021-16/
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