How severe is CVE-2020-7713?

CVE-2020-7713 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-2020-7713 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-7713?

CVE-2020-7713 affects Arr-flatten-unflatten Project Arr-flatten-unflatten. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7713?

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-2020-7713 published?

CVE-2020-7713 was published on 2020-09-01 and last updated on 2026-06-17.

CVE-2020-7713

CVE-2020-7713 is a critical-severity vulnerability in Arr-flatten-unflatten Project Arr-flatten-unflatten 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-1321.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Arr-flatten-unflatten Project Arr-flatten-unflatten
Published: 2020-09-01
Last modified: 2026-06-17

Description

All versions of package arr-flatten-unflatten are vulnerable to Prototype Pollution via the constructor.

Frequently asked questions

What is CVE-2020-7713?: All versions of package arr-flatten-unflatten are vulnerable to Prototype Pollution via the constructor.
How severe is CVE-2020-7713?: CVE-2020-7713 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-2020-7713 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-7713?: CVE-2020-7713 affects Arr-flatten-unflatten Project Arr-flatten-unflatten. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7713?: 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-2020-7713 published?: CVE-2020-7713 was published on 2020-09-01 and last updated on 2026-06-17.

References

https://snyk.io/vuln/SNYK-JS-ARRFLATTENUNFLATTEN-598396

Affected products (1)

cpe:2.3:a:arr-flatten-unflatten_project:arr-flatten-unflatten:*:*:*:*:*:node.js:*:*

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