How severe is CVE-2020-7700?

CVE-2020-7700 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-2020-7700 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-2020-7700?

CVE-2020-7700 affects Php.js Project Php.js. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7700?

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-2020-7700 published?

CVE-2020-7700 was published on 2020-08-14 and last updated on 2026-06-17.

CVE-2020-7700

CVE-2020-7700 is a critical-severity vulnerability in Php.js Project Php.js 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: Php.js Project Php.js
Published: 2020-08-14
Last modified: 2026-06-17

Description

All versions of phpjs are vulnerable to Prototype Pollution via parse_str.

Frequently asked questions

What is CVE-2020-7700?: All versions of phpjs are vulnerable to Prototype Pollution via parse_str.
How severe is CVE-2020-7700?: CVE-2020-7700 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-2020-7700 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-2020-7700?: CVE-2020-7700 affects Php.js Project Php.js. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7700?: 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-2020-7700 published?: CVE-2020-7700 was published on 2020-08-14 and last updated on 2026-06-17.

References

https://snyk.io/vuln/SNYK-JS-PHPJS-598681

Affected products (1)

cpe:2.3:a:php.js_project:php.js:-:*:*:*:*:*:*:*

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