Medium severity · published Jul 26, 2022
CVE-2021-33439
An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6)
5.5
CVSS
0.3%
EPSS
No
On KEV
Description
An issue was discovered in mjs (mJS: Restricted JavaScript engine), ES6 (JavaScript version 6). There is Integer overflow in gc_compact_strings() in mjs.c.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MJ
Mjs · Cesanta
before 2.20.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-33439
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-33439
Third Party Advisory
https://gist.github.com/Clingto/bb632c0c463f4b2c97e4f65f751c5e6d
Exploit
https://github.com/cesanta/mjs/issues/159
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