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CVE-2006-6171

23
FAUCET Score

CVE-2006-6171 describes an off-by-two buffer underflow vulnerability in ProFTPD 1.3.0a and earlier versions, stemming from improper buffer size handling when CommandBufferSize is configured. This vulnerability carries a CVSS score of 7.5, indicating a high severity, and could lead to partial confidentiality, integrity, and availability impacts with low attack complexity and no authentication required. Despite the high severity, ProFTPD developers dispute its existence, and there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.3.0aCPE matchmatch criteria
cpe:2.3:a:proftpd_project:proftpd:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
9.59%
Probability of exploitation in next 30 days
EPSS Percentile
95.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0959 is in the 92nd percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

redhatvendor investigatingvia nvd_reference
View patch

References

proftp.cvs.sourceforge.net / proftp/proftpd/src/main.c
Vendor Advisory
bugzilla.redhat.com / bugzilla/show_bug.cgi
Vendor Advisory
secunia.com / advisories/23174
secunia.com / advisories/23179
secunia.com / advisories/23184
secunia.com / advisories/23207
secunia.com / advisories/23329
slackware.com / security/viewer.php
debian.org / security/2006/dsa-1218
debian.org / security/2006/dsa-1222
gentoo.org / security/en/glsa/glsa-200611-26.xml
mandriva.com / security/advisories
openpkg.com / security/advisories/OpenPKG-SA-2006.035.html
trustix.org / errata/2006/0070