CVE-2021-23409
HIGHCVSS 7.5/10EPSS 1.65%
Last modified
CVE-2021-23409 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The package github.com/pires/go-proxyproto before 0.6.0 are vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header.. EPSS estimates a 1.65% chance of exploitation in the next 30 days.
Description
The package github.com/pires/go-proxyproto before 0.6.0 are vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Go-Proxyproto Project | Go-Proxyproto | < 0.6.0 |
References
- https://github.com/pires/go-proxyproto/issues/65Issue Tracking, Third Party Advisory
- https://github.com/pires/go-proxyproto/pull/74Patch, Third Party Advisory
- https://github.com/pires/go-proxyproto/pull/74/commits/cdc63867da24fc609b727231f682670d0d1cd346Patch, Third Party Advisory
- https://github.com/pires/go-proxyproto/releases/tag/v0.6.0Release Notes, Third Party Advisory
- https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439Patch, Third Party Advisory
- https://github.com/pires/go-proxyproto/issues/65Issue Tracking, Third Party Advisory
- https://github.com/pires/go-proxyproto/pull/74Patch, Third Party Advisory
- https://github.com/pires/go-proxyproto/pull/74/commits/cdc63867da24fc609b727231f682670d0d1cd346Patch, Third Party Advisory
- https://github.com/pires/go-proxyproto/releases/tag/v0.6.0Release Notes, Third Party Advisory
- https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1316439Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23409?
The package github.com/pires/go-proxyproto before 0.6.0 are vulnerable to Denial of Service (DoS) via creating connections without the proxy protocol header.
How severe is CVE-2021-23409?
CVE-2021-23409 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.65% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23409?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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