How severe is CVE-2021-29324?

CVE-2021-29324 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-29324 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29324?

CVE-2021-29324 affects Moddable. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29324?

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

When was CVE-2021-29324 published?

CVE-2021-29324 was published on 2021-11-19 and last updated on 2026-06-17.

CVE-2021-29324

CVE-2021-29324 is a high-severity vulnerability in Moddable with a CVSS 3.x base score of 7.8. 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-770.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-770
Affected product: Moddable
Published: 2021-11-19
Last modified: 2026-06-17

Description

OpenSource Moddable v10.5.0 was discovered to contain a stack overflow via the component /moddable/xs/sources/xsScript.c.

Frequently asked questions

What is CVE-2021-29324?: OpenSource Moddable v10.5.0 was discovered to contain a stack overflow via the component /moddable/xs/sources/xsScript.c.
How severe is CVE-2021-29324?: CVE-2021-29324 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-29324 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29324?: CVE-2021-29324 affects Moddable. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29324?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-29324 published?: CVE-2021-29324 was published on 2021-11-19 and last updated on 2026-06-17.

References

https://github.com/Moddable-OpenSource/moddable/issues/586

Affected products (1)

cpe:2.3:a:moddable:moddable:10.5.0:*:*:*:*:*:*:*

More vulnerabilities in Moddable

CVE-2020-25462 — Critical (CVSS 9.8): Heap buffer overflow in the fxCheckArrowFunction function at moddable/xs/sources/xsSyntaxical.c:3562 in Moddable SDK…
CVE-2019-16366 — Critical (CVSS 9.8): In XS 9.0.0 in Moddable SDK OS180329, there is a heap-based buffer overflow in fxBeginHost in xsAPI.c when called from…
CVE-2021-29329 — High (CVSS 7.8): OpenSource Moddable v10.5.0 was discovered to contain a stack overflow in the fxBinaryExpressionNodeDistribute function…
CVE-2021-29327 — High (CVSS 7.8): OpenSource Moddable v10.5.0 was discovered to contain a heap buffer overflow in the fx_ArrayBuffer function at…
CVE-2021-29326 — High (CVSS 7.8): OpenSource Moddable v10.5.0 was discovered to contain a heap buffer overflow in the fxIDToString function at…
CVE-2021-29325 — High (CVSS 7.8): OpenSource Moddable v10.5.0 was discovered to contain a heap buffer overflow in the fx_String_prototype_repeat function…

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