CVE-2006-6171
** DISPUTED ** ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when...
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
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 High
AV: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
| Package | Affected | Fixed |
|---|---|---|
proftpd-dfsgDebian:12 |
before 1.3.0-13 | 1.3.0-13 |
proftpd-dfsgDebian:13 |
before 1.3.0-13 | 1.3.0-13 |
proftpd-dfsgDebian:14 |
before 1.3.0-13 | 1.3.0-13 |
proftpdDebian: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
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases | EUVD | |
| first indexed | CVE 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
debian.org/security/2006/dsa-1222
proftp.cvs.sourceforge.net/proftp/proftpd/src/main.c?r1=1.292&r2=1.293&sortby=date
debian.org/security/2006/dsa-1218
secunia.com/advisories/23207
slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.502491
secunia.com/advisories/23174
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mandriva.com/security/advisories?name=MDKSA-2006:217-1
trustix.org/errata/2006/0070
secunia.com/advisories/23329
bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214820
secunia.com/advisories/23184
secunia.com/advisories/23179
gentoo.org/security/en/glsa/glsa-200611-26.xml
openpkg.com/security/advisories/OpenPKG-SA-2006.035.html
nvd.nist.gov/vuln/detail/CVE-2006-6171
github.com/advisories/GHSA-fg3g-4994-3829
security-tracker.debian.org/tracker/CVE-2006-6171