How severe is CVE-2020-8125?

CVE-2020-8125 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-2020-8125 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-8125?

CVE-2020-8125 affects Klona Project Klona. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-8125?

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-2020-8125 published?

CVE-2020-8125 was published on 2020-02-04 and last updated on 2026-06-17.

CVE-2020-8125

CVE-2020-8125 is a critical-severity vulnerability in Klona Project Klona 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-20.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 4% (90th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Klona Project Klona
Published: 2020-02-04
Last modified: 2026-06-17

Description

Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.

Frequently asked questions

What is CVE-2020-8125?: Flaw in input validation in npm package klona version 1.1.0 and earlier may allow prototype pollution attack that may result in remote code execution or denial of service of applications using klona.
How severe is CVE-2020-8125?: CVE-2020-8125 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-2020-8125 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-8125?: CVE-2020-8125 affects Klona Project Klona. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-8125?: 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-2020-8125 published?: CVE-2020-8125 was published on 2020-02-04 and last updated on 2026-06-17.

References

https://hackerone.com/reports/778414

Affected products (1)

cpe:2.3:a:klona_project:klona:*:*:*:*:*:node.js:*:*

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