CVE-2017-20146

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 71% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
48.8%
KEV
Not listed

Published

December 27, 2022

Last Modified

April 11, 2025

Advisory Details (3)

Auto-updated Jun 23, 2026
Patch available. Sources: github_commit, github_pr.
generic

GO-2020-0020 - Go Packages

https://pkg.go.dev/vuln/GO-2020-0020
github_pr Patch Available

Don't return the origin header when configured to *

Patch available: gorilla/handlers v1.3.0 (PR #116 merged 2017-11-01)

https://github.com/gorilla/handlers/pull/116
github_commit Patch Available

commit 90663712d74c (gorilla/handlers)

Patch available: gorilla/handlers v1.3.0 (contains commit 90663712d74c)

https://github.com/gorilla/handlers/commit/90663712d74cb411cbef281bc1e08c19d1a76145

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/gorilla/handlers—1.3.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-11 08:24 UTCEPSS rescore
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-08 15:10 UTCEPSS rescore
  4. 2026-07-07 13:42 UTCEPSS rescore
  5. 2026-07-06 16:24 UTCEPSS rescore
  6. 2026-07-06 16:24 UTCEPSS rescore
  7. 2026-07-06 02:20 UTCEPSS rescore
  8. 2026-07-06 02:20 UTCEPSS rescore
  9. 2026-07-05 02:27 UTCEPSS rescore
  10. 2026-07-04 06:28 UTCEPSS rescore
  11. 2026-07-02 16:54 UTCEPSS rescore
  12. 2026-07-01 15:02 UTCEPSS rescore
  13. 2026-06-30 23:19 UTCEPSS rescore
  14. 2026-06-30 23:19 UTCEPSS rescore
  15. 2026-06-29 14:03 UTCEPSS rescore
  16. 2026-06-28 14:04 UTCEPSS rescore
  17. 2026-06-28 10:19 UTCOSV refresh
  18. 2026-06-28 04:53 UTCEPSS rescore
  19. 2026-06-27 03:06 UTCEPSS rescore
  20. 2026-06-27 03:05 UTCEPSS rescore
  21. 2026-06-25 13:47 UTCEPSS rescore
  22. 2026-06-24 14:02 UTCEPSS rescore
  23. 2026-06-24 14:02 UTCEPSS rescore
  24. 2026-06-23 21:30 UTCEPSS rescore
  25. 2026-06-22 14:23 UTCEPSS rescore
Show 45 more
  1. 2026-06-22 14:23 UTCEPSS rescore
  2. 2026-06-21 14:54 UTCEPSS rescore
  3. 2026-06-21 14:54 UTCEPSS rescore
  4. 2026-06-21 01:57 UTCEPSS rescore
  5. 2026-06-21 01:57 UTCEPSS rescore
  6. 2026-06-19 19:23 UTCEPSS rescore
  7. 2026-06-19 19:23 UTCEPSS rescore
  8. 2026-06-18 17:50 UTCEPSS rescore
  9. 2026-06-17 17:50 UTCEPSS rescore
  10. 2026-06-16 17:50 UTCEPSS rescore
  11. 2026-06-16 17:50 UTCEPSS rescore
  12. 2026-06-15 17:45 UTCEPSS rescore
  13. 2026-06-14 23:14 UTCEPSS rescore
  14. 2026-06-13 22:57 UTCEPSS rescore
  15. 2026-06-12 23:09 UTCEPSS rescore
  16. 2026-06-10 22:15 UTCEPSS rescore
  17. 2026-06-10 20:47 UTCOSV refresh
  18. 2026-06-10 13:19 UTCEPSS rescore
  19. 2026-06-08 14:14 UTCEPSS rescore
  20. 2026-06-08 14:14 UTCEPSS rescore
  21. 2026-06-07 15:22 UTCEPSS rescore
  22. 2026-06-07 15:22 UTCEPSS rescore
  23. 2026-06-06 13:45 UTCEPSS rescore
  24. 2026-06-06 13:45 UTCEPSS rescore
  25. 2026-06-05 22:44 UTCEPSS rescore
  26. 2026-06-05 06:08 UTCEPSS rescore
  27. 2026-06-05 06:08 UTCEPSS rescore
  28. 2026-06-04 13:10 UTCEPSS rescore
  29. 2026-06-02 20:11 UTCEPSS rescore
  30. 2026-06-02 20:11 UTCEPSS rescore
  31. 2026-06-01 13:49 UTCEPSS rescore
  32. 2026-05-31 22:28 UTCEPSS rescore
  33. 2026-05-31 22:28 UTCEPSS rescore
  34. 2026-05-31 00:14 UTCEPSS rescore
  35. 2026-05-31 00:14 UTCEPSS rescore
  36. 2026-05-29 13:41 UTCEPSS rescore
  37. 2026-05-28 13:42 UTCEPSS rescore
  38. 2026-05-28 13:42 UTCEPSS rescore
  39. 2026-05-27 13:38 UTCEPSS rescore
  40. 2026-05-27 13:38 UTCEPSS rescore
  41. 2026-05-26 13:42 UTCEPSS rescore
  42. 2026-05-26 13:42 UTCEPSS rescore
  43. 2026-05-26 07:17 UTCEPSS rescore
  44. 2026-05-26 07:17 UTCEPSS rescore
  45. 2026-05-25 09:40 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2017-20146?
CVE-2017-20146 is a critical vulnerability published on December 27, 2022. Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the value of the Access-Control-Allow-Origin header, which bypasses the expected behavior of the Same Origin Policy.
When was CVE-2017-20146 disclosed?
CVE-2017-20146 was first published in the National Vulnerability Database on December 27, 2022, with the most recent update on April 11, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-20146 actively exploited?
CVE-2017-20146 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 48.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-20146?
CVE-2017-20146 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-20146?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-20146, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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