Is CVE-2021-23409 in the CISA KEV catalog?

No. CVE-2021-23409 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23409?

CVE-2021-23409 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-23409?

CVE-2021-23409 has an EPSS score of 1.65% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23409?

Upgrade golang-github-pires-go-proxyproto on debian 12 to 0.4.2-2 or later.

CVE & CISA-KEV Catalog

CVE-2021-23409

HIGHEPSS 74th pctl

7.5

CVSS v3

NVD

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.

How to fix

Remediation Available

golang-github-pires-go-proxyprotoDebian

Fixed in:0.4.2-2CVE-2021-23409

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.65%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Patch3

Third-Party Advisory2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.