How severe is CVE-2021-42863?

CVE-2021-42863 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-2021-42863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-42863?

CVE-2021-42863 affects Jerryscript. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-42863?

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-2021-42863 published?

CVE-2021-42863 was published on 2022-05-12 and last updated on 2026-06-17.

CVE-2021-42863

CVE-2021-42863 is a critical-severity vulnerability in Jerryscript 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)
CVSS v2: 7.5
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Jerryscript
Published: 2022-05-12
Last modified: 2026-06-17

Description

A buffer overflow in ecma_builtin_typedarray_prototype_filter() in JerryScript version fe3a5c0 allows an attacker to construct a fake object or a fake arraybuffer with unlimited size.

Frequently asked questions

What is CVE-2021-42863?: A buffer overflow in ecma_builtin_typedarray_prototype_filter() in JerryScript version fe3a5c0 allows an attacker to construct a fake object or a fake arraybuffer with unlimited size.
How severe is CVE-2021-42863?: CVE-2021-42863 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-2021-42863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-42863?: CVE-2021-42863 affects Jerryscript. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-42863?: 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-2021-42863 published?: CVE-2021-42863 was published on 2022-05-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jerryscript:jerryscript:*:*:*:*:*:*:*:*

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