CVE-2021-31875

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

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."

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-193CWE-787

Affected software

No affected versions have been published.

Timeline

Published
Apr 29, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-31875: Critical severity, CVSS 9.8 | Vulnix