How severe is CVE-2020-36066?

CVE-2020-36066 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-36066 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36066?

CVE-2020-36066 affects Gjson Project Gjson. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36066?

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-2020-36066 published?

CVE-2020-36066 was published on 2021-01-05 and last updated on 2026-06-17.

CVE-2020-36066

Q: What is CVE-2020-36066?

GJSON <1.6.5 allows attackers to cause a denial of service (remote) via crafted JSON.

CVE-2020-36066 is a high-severity vulnerability in Gjson Project Gjson with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Gjson Project Gjson
Published: 2021-01-05
Last modified: 2026-06-17

Description

GJSON <1.6.5 allows attackers to cause a denial of service (remote) via crafted JSON.

Frequently asked questions

What is CVE-2020-36066?: GJSON <1.6.5 allows attackers to cause a denial of service (remote) via crafted JSON.
How severe is CVE-2020-36066?: CVE-2020-36066 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-36066 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36066?: CVE-2020-36066 affects Gjson Project Gjson. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36066?: 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-2020-36066 published?: CVE-2020-36066 was published on 2021-01-05 and last updated on 2026-06-17.

References

https://github.com/tidwall/gjson/issues/195

Affected products (1)

cpe:2.3:a:gjson_project:gjson:*:*:*:*:*:*:*:*

More vulnerabilities in Gjson Project Gjson

CVE-2021-42836 — High (CVSS 7.5): GJSON before 1.9.3 allows a ReDoS (regular expression denial of service) attack.
CVE-2020-36067 — High (CVSS 7.5): GJSON <=v1.6.5 allows attackers to cause a denial of service (panic: runtime error: slice bounds out of range) via a…
CVE-2020-35380 — High (CVSS 7.5): GJSON before 1.6.4 allows attackers to cause a denial of service via crafted JSON.

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