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CVE-2020-36564

24
FAUCET Score

CVE-2020-36564 is a high-severity vulnerability affecting the nosurf_project nosurf library, stemming from improper validation of caller input. This flaw allows a malformed expected token to silently disable validation, causing any user-supplied token to be accepted as valid. With a CVSS score of 7.5, it presents a high integrity impact (I:H) via a network attack vector (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) or user interaction (UI:N). There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.1.1CPE matchmatch criteria
cpe:2.3:a:nosurf_project:nosurf:*:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.72%
Probability of exploitation in next 30 days
EPSS Percentile
50.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0072 is in the 26th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/justinas/nosurfFixed in: 1.1.1

Vendor Advisories (1)

goGHSA-5x84-q523-vvwrhigh

nosurf vulnerable to improper input validation

Dec 28, 2022

References

github.com / justinas/nosurf/commit/4d86df7a4affa1fa50ab39fb09aac56c3ce9c314
PatchThird Party Advisory
github.com / justinas/nosurf/pull/60
PatchThird Party Advisory
pkg.go.dev / vuln/GO-2020-0049
Third Party Advisory