How severe is CVE-2020-7770?

CVE-2020-7770 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2020-7770 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-2020-7770?

CVE-2020-7770 affects Json8 Project Json8. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-7770?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-7770 published?

CVE-2020-7770 was published on 2020-11-12 and last updated on 2026-06-17.

CVE-2020-7770

CVE-2020-7770 is a medium-severity vulnerability in Json8 Project Json8 with a CVSS 3.x base score of 6.5. 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: Medium (CVSS 3.x base score 6.5)
CVSS v2: 7.5
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1321
Affected product: Json8 Project Json8
Published: 2020-11-12
Last modified: 2026-06-17

Description

This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.

Frequently asked questions

What is CVE-2020-7770?: This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.
How severe is CVE-2020-7770?: CVE-2020-7770 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2020-7770 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-2020-7770?: CVE-2020-7770 affects Json8 Project Json8. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-7770?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-7770 published?: CVE-2020-7770 was published on 2020-11-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:json8_project:json8:*:*:*:*:*:*:*:*

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