How severe is CVE-2020-36564?

CVE-2020-36564 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 high, and availability none.

Is CVE-2020-36564 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36564?

CVE-2020-36564 affects Nosurf Project Nosurf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36564?

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-2020-36564 published?

CVE-2020-36564 was published on 2022-12-27 and last updated on 2026-06-17.

CVE-2020-36564

CVE-2020-36564 is a high-severity vulnerability in Nosurf Project Nosurf 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. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Nosurf Project Nosurf
Published: 2022-12-27
Last modified: 2026-06-17

Description

Due to improper validation of caller input, validation is silently disabled if the provided expected token is malformed, causing any user supplied token to be considered valid.

Frequently asked questions

What is CVE-2020-36564?: Due to improper validation of caller input, validation is silently disabled if the provided expected token is malformed, causing any user supplied token to be considered valid.
How severe is CVE-2020-36564?: CVE-2020-36564 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 high, and availability none.
Is CVE-2020-36564 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36564?: CVE-2020-36564 affects Nosurf Project Nosurf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36564?: 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-2020-36564 published?: CVE-2020-36564 was published on 2022-12-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nosurf_project:nosurf:*:*:*:*:*:go:*:*

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