Is CVE-2006-6171 in the CISA KEV catalog?

No. CVE-2006-6171 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2006-6171?

CVE-2006-6171 has a CVSS v2 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2006-6171?

CVE-2006-6171 has an EPSS score of 9.59% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2006-6171?

Upgrade proftpd-dfsg on debian 11 to 1.3.0-13 or later.

CVE & CISA-KEV Catalog

CVE-2006-6171

HIGHEPSS 95th pctl

7.5

CVSS v2

NVD

Description

ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which leads to an off-by-two buffer underflow. NOTE: in November 2006, the role of CommandBufferSize was originally associated with CVE-2006-5815, but this was an error stemming from a vague initial disclosure. NOTE: ProFTPD developers dispute this issue, saying that the relevant memory location is overwritten by assignment before further use within the affected function, so this is not a vulnerability

How to fix

Remediation Available

proftpd-dfsgDebian

Fixed in:1.3.0-13CVE-2006-6171

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

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

9.59%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Vendor Advisory2

Other references12

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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 2026-04-23.