How severe is CVE-2018-20201?

CVE-2018-20201 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-2018-20201 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20201?

CVE-2018-20201 affects Pur3 Espruino. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20201?

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-2018-20201 published?

CVE-2018-20201 was published on 2018-12-18 and last updated on 2026-06-17.

CVE-2018-20201

CVE-2018-20201 is a high-severity vulnerability in Pur3 Espruino 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-125.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Pur3 Espruino
Published: 2018-12-18
Last modified: 2026-06-17

Description

There is a stack-based buffer over-read in the jsfNameFromString function of jsflash.c in Espruino 2V00, leading to a denial of service or possibly unspecified other impact via a crafted js file.

Frequently asked questions

What is CVE-2018-20201?: There is a stack-based buffer over-read in the jsfNameFromString function of jsflash.c in Espruino 2V00, leading to a denial of service or possibly unspecified other impact via a crafted js file.
How severe is CVE-2018-20201?: CVE-2018-20201 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-2018-20201 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20201?: CVE-2018-20201 affects Pur3 Espruino. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20201?: 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-2018-20201 published?: CVE-2018-20201 was published on 2018-12-18 and last updated on 2026-06-17.

References

https://github.com/espruino/Espruino/issues/1587

Affected products (1)

cpe:2.3:o:pur3:espruino:2.00:*:*:*:*:*:*:*

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