CVE-2021-23409

CVE-2021-23409 is a high-severity vulnerability in Go-proxyproto Project Go-proxyproto with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

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.

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 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-23409 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-23409?
CVE-2021-23409 affects Go-proxyproto Project Go-proxyproto. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-23409?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-23409 published?
CVE-2021-23409 was published on 2021-07-21 and last updated on 2026-06-17.

References

Affected products (1)

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