Vulnerability Details : CVE-2021-31875
Potential exploit
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."
Vulnerability category: Overflow
Products affected by CVE-2021-31875
- cpe:2.3:a:cesanta:mongooseos_mjs:1.26:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31875
0.55%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 65 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31875
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | AV:N/AC:L/Au:N/C:P/I:P/A:P |
10.0
|
6.4
|
NIST | |
|
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2021-31875
-
A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.Assigned by: nvd@nist.gov (Primary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-31875
-
https://github.com/418sec/mjs/pull/2
Fix culprit for JSON heap overflow by ex0dus-0x · Pull Request #2 · 418sec/mjs · GitHubPatch;Third Party Advisory
-
https://huntr.dev/bounties/1-other-mjs/
huntr: Off-by-One Heap-based Buffer Overflow C Vulnerability in mjsExploit;Third Party Advisory
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https://github.com/cesanta/mjs/releases/tag/1.26
Release v1.26 · cesanta/mjs · GitHubRelease Notes;Third Party Advisory
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