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CVE-2017-20146

31
FAUCET Score

CVE-2017-20146 is a critical vulnerability affecting gorillatoolkit handlers, where improper CORS header application allows attackers to control the Access-Control-Allow-Origin header, bypassing the Same Origin Policy. With a CVSS score of 9.8 (CRITICAL), this vulnerability is easily exploitable over the network with low complexity, potentially leading to complete compromise of confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion with 10 mentions, indicating awareness. It is not listed on CISA's KEV catalog and is currently inactive on the Hot List.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.3.0CPE matchmatch criteria
cpe:2.3:a:gorillatoolkit:handlers:*:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 32nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 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/gorilla/handlersFixed in: 1.3.0

Vendor Advisories (2)

goGHSA-jcr6-mmjj-pchwcritical

gorilla/handlers may allow requester to bypass expected behavior of the Same Origin Policy

Dec 28, 2022
redhatCVE-2017-20146Moderate

gorilla: Usage of the CORS handler may apply improper CORS headers

Dec 27, 2022

References

github.com / gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145
PatchThird Party Advisory
github.com / gorilla/handlers/pull/116
PatchThird Party Advisory
pkg.go.dev / vuln/GO-2020-0020
Third Party Advisory