CVE-2021-31875

** DISPUTED ** In mjs_json.c in Cesanta MongooseOS mJS 1.26, a maliciously formed JSON string can trigger an off-by-one heap-based buffer overflow in mjs_json_parse, which can potentially lead to redirection of control flow. NOTE: the original reporter disputes the significance of this finding because "there isn’t very much of an opportunity to exploit this reliably for an information leak, so there isn’t any real security impact."

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 7.5 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

Link	Resource
https://github.com/418sec/mjs/pull/2	Patch Third Party Advisory
https://github.com/cesanta/mjs/releases/tag/1.26	Release Notes Third Party Advisory
https://huntr.dev/bounties/1-other-mjs/	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:cesanta:mongooseos_mjs:1.26:*:*:*:*:*:*:*

Information

Published : 2021-04-28 19:15

Updated : 2023-03-01 08:02

NVD link : CVE-2021-31875

Mitre link : CVE-2021-31875

JSON object : View

CWE

CWE-787

Out-of-bounds Write

CWE-193

Off-by-one Error

Products Affected

cesanta

mongooseos_mjs

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9.8 /10