PatchTheCVECVE-2017-20146: Usage of the CORS handler may apply improper CORS headers, allowing the requester to explicitly control the va
CVE-2017-20146 is a critical-severity flaw (CVSS 9.8) affecting handlers. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.8% (top 45%) |
| CISA exploited list | No |
| Weakness | CWE-346 |
| Published | 2022-12-27 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2017-20146?
handlers: upgrade to 1.3.0. Exact commands for each OS are on this page.
Is CVE-2017-20146 being exploited?
CVE-2017-20146 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2017-20146 affect?
CVE-2017-20146 affects handlers. Severity is critical (CVSS 9.8). 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.
How urgent is CVE-2017-20146?
Priority 53/100. Critical severity; Remotely exploitable, no login, no user action