How severe is CVE-2023-50044?

CVE-2023-50044 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-50044 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-50044?

CVE-2023-50044 affects Cesanta Mjs. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-50044?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-50044 published?

CVE-2023-50044 was published on 2023-12-20 and last updated on 2026-06-17.

CVE-2023-50044

CVE-2023-50044 is a critical-severity vulnerability in Cesanta Mjs with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Cesanta Mjs
Published: 2023-12-20
Last modified: 2026-06-17

Description

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 input string.

Frequently asked questions

What is CVE-2023-50044?: 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 input string.
How severe is CVE-2023-50044?: CVE-2023-50044 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-50044 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-50044?: CVE-2023-50044 affects Cesanta Mjs. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-50044?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-50044 published?: CVE-2023-50044 was published on 2023-12-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cesanta:mjs:2.22.0:*:*:*:*:*:*:*

More vulnerabilities in Cesanta Mjs

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.
CVE-2021-46523 — High (CVSS 7.8): Cesanta MJS v2.20.0 was discovered to contain a heap buffer overflow via to_json_or_debug at mjs/src/mjs_json.c.

All CVEs affecting Cesanta Mjs →

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