CVE-2006-6171: ProFTPD 1.3.0a and earlier does not properly set the buffer size limit when CommandBufferSize is specified in the configuration file, which
Noroxi assessment
Priority: Monitor (action score 33/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 9.6% (FIRST EPSS); higher than 95.4% of all records.
- No special conditions are required; it is repeatable.
- Fixed version: proftpd-dfsg (Debian:12) 1.3.0-13; proftpd (Debian:3.1) 1.2.10-15sarge2.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to proftpd-dfsg (Debian:12) 1.3.0-13; proftpd (Debian:3.1) 1.2.10-15sarge2 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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
- Published
- Nov 30, 2006
- Updated
- Jun 16, 2026
- EPSS
- 9.6% · 95th percentile
- CWE
- —
Report tools
Action score
33
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 3 / 30 · 9.6%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| proftpd project | proftpd | cpe:2.3:a:proftpd_project:proftpd |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- proftpd project proftpdup to 1.3.0a inclusive
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | proftpd-dfsg | before 1.3.0-13 | 1.3.0-13 |
| Debian:3.1 | proftpd | before 1.2.10-15sarge2 | 1.2.10-15sarge2 |
Same product
proftpd project: all recordsOther highest-scoring records for the same primary product.
- CVE-2006-5815Stack-based buffer overflow in the sreplace function in ProFTPD 1.3.0 and earlier allows remote attackers, probably authenticated, to cause 63This week
- CVE-2003-0831ProFTPD 1.2.7 through 1.2.9rc2 does not properly translate newline characters when transferring files in ASCII mode, which allows remote att54Plan
- CVE-2009-0542SQL injection vulnerability in ProFTPD Server 1.3.1 through 1.3.2rc2 allows remote attackers to execute arbitrary SQL commands via a "%" (pe52Plan
Published before and after this one in the same product
- ← EarlierCVE-2005-4816Dec 31, 2005 · Buffer overflow in mod_radius in ProFTPD before 1.3.0rc2 allows remote attackers to cause a denial of service (crash) and possibly execute a34Monitor
- ← EarlierCVE-2006-6170Nov 30, 2006 · Buffer overflow in the tls_x509_name_oneline function in the mod_tls module, as used in ProFTPD 1.3.0a and earlier, and possibly other produ35Monitor
- Later →CVE-2006-6563Dec 15, 2006 · Stack-based buffer overflow in the pr_ctrls_recv_request function in ctrls.c in the mod_ctrls module in ProFTPD before 1.3.1rc1 allows local27Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:proftpd | 1.2.10-15sarge2 · Debian:3.1 | Package registry (OSV) |
| debian:proftpd-dfsg | 1.3.0-13 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-20-633 · Aug 24, 2020(Proftpd Sunucu Güvenlik Güncellemesi)
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- P
Weakness class (CWE)
—
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (13 more)Show less
- 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?l=slackware-security&y=2006&m=slackware-security.502491
- www.debian.org/security/2006/dsa-1218
- www.debian.org/security/2006/dsa-1222
- www.gentoo.org/security/en/glsa/glsa-200611-26.xml
- www.mandriva.com/security/advisories?name=MDKSA-2006:217-1
- www.openpkg.com/security/advisories/OpenPKG-SA-2006.035.html
- www.trustix.org/errata/2006/0070
- bugzilla.redhat.com/bugzilla/show_bug.cgi?id=214820
Vendor advisories and official records. Exploit/PoC links are deliberately left out.