How severe is CVE-2021-46512?

CVE-2021-46512 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-46512 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46512?

CVE-2021-46512 affects Cesanta Mjs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-46512?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-46512 published?

CVE-2021-46512 was published on 2022-01-27 and last updated on 2026-06-17.

CVE-2021-46512

CVE-2021-46512 is a medium-severity vulnerability in Cesanta Mjs with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cesanta Mjs
Published: 2022-01-27
Last modified: 2026-06-17

Description

Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via mjs_apply at src/mjs_exec.c. This vulnerability can lead to a Denial of Service (DoS).

Frequently asked questions

What is CVE-2021-46512?: Cesanta MJS v2.20.0 was discovered to contain a SEGV vulnerability via mjs_apply at src/mjs_exec.c. This vulnerability can lead to a Denial of Service (DoS).
How severe is CVE-2021-46512?: CVE-2021-46512 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-46512 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46512?: CVE-2021-46512 affects Cesanta Mjs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-46512?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-46512 published?: CVE-2021-46512 was published on 2022-01-27 and last updated on 2026-06-17.

References

https://github.com/cesanta/mjs/issues/202

Affected products (1)

cpe:2.3:a:cesanta:mjs:2.20.0:*:*:*:*:*:*:*

More vulnerabilities in Cesanta Mjs

CVE-2023-50044 — Critical (CVSS 9.8): Cesanta MJS 2.20.0 has a getprop_builtin_foreign out-of-bounds read if a Built-in API name occurs in a substring of an…
CVE-2023-43338 — Critical (CVSS 9.8): Cesanta mjs v2.20.0 was discovered to contain a function pointer hijacking vulnerability via the function…
CVE-2021-46527 — High (CVSS 7.8): Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via mjs_get_cstring at src/mjs_string.c.
CVE-2021-46526 — High (CVSS 7.8): Cesanta MJS v2.20.0 was discovered to contain a global buffer overflow via snquote at src/mjs_json.c.
CVE-2021-46525 — High (CVSS 7.8): Cesanta MJS v2.20.0 was discovered to contain a heap-use-after-free via mjs_apply at src/mjs_exec.c.
CVE-2021-46524 — High (CVSS 7.8): Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via snquote at mjs/src/mjs_json.c.

All CVEs affecting Cesanta Mjs →