How severe is CVE-2023-36109?

CVE-2023-36109 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-2023-36109 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36109?

CVE-2023-36109 affects Jerryscript. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-36109?

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-2023-36109 published?

CVE-2023-36109 was published on 2023-09-20 and last updated on 2026-06-17.

CVE-2023-36109

CVE-2023-36109 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)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Jerryscript
Published: 2023-09-20
Last modified: 2026-06-17

Description

Buffer Overflow vulnerability in JerryScript version 3.0, allows remote attackers to execute arbitrary code via ecma_stringbuilder_append_raw component at /jerry-core/ecma/base/ecma-helpers-string.c.

Frequently asked questions

What is CVE-2023-36109?: Buffer Overflow vulnerability in JerryScript version 3.0, allows remote attackers to execute arbitrary code via ecma_stringbuilder_append_raw component at /jerry-core/ecma/base/ecma-helpers-string.c.
How severe is CVE-2023-36109?: CVE-2023-36109 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-2023-36109 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36109?: CVE-2023-36109 affects Jerryscript. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-36109?: 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-2023-36109 published?: CVE-2023-36109 was published on 2023-09-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:jerryscript:jerryscript:3.0:*:*:*:*:*:*:*

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