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CVE-2006-6171

** DISPUTED ** ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when...

7.5 HighFix availableDisputed

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

Exploit likelihood

10.2%Up 7.6 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

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

Record
CVE-2006-6171
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

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

Record
CVE-2006-6171
Updated
2026-11-02
EUVDEUVD-2006-6154 No score

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

Record
EUVD-2006-6154
Updated
2026-11-03
GitHub AdvisoriesGHSA-fg3g-4994-3829 No score

** DISPUTED ** ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when...

** DISPUTED ** 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.

Record
GHSA-fg3g-4994-3829
Updated
2026-11-02
OSV No score

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

Record
CVE-2006-6171
Updated
2026-11-02
OSVDEBIAN-CVE-2006-6171 No score

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

Record
DEBIAN-CVE-2006-6171
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
proftpd-dfsg
Debian:12
before 1.3.0-13
1.3.0-13
proftpd-dfsg
Debian:13
before 1.3.0-13
1.3.0-13
proftpd-dfsg
Debian:14
before 1.3.0-13
1.3.0-13
proftpd
Debian:3.1
before 1.2.10-15sarge2, plus listed versions
1.2.10-151.2.10-15sarge11.2.10-15sarge1.0.1
1.2.10-15sarge2

History

History
RecordedChangedSources
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2006-6171 is a high vulnerability (CVSS 7.5) in Proftpd Project Proftpd, published November 21, 2006. Its validity is disputed. EPSS puts the chance of exploitation in the next 30 days at 10.2%, the 95th percentile. Fixed in proftpd-dfsg 1.3.0-13.

References

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