ProFTPD before 1.3.5e and 1.3.6 before 1.3.6rc5 controls whether the home directory of a user could contain a symbolic link through the Allo
ProFTPD before 1.3.5e and 1.3.6 before 1.3.6rc5 controls whether the home directory of a user could contain a symbolic link through the AllowChrootSymlinks configuration option, but checks only the last path component when enforcing AllowChrootSymlinks. Attackers with local access could bypass the AllowChrootSymlinks control by replacing a path component (other than the last one) with a symbolic link. The threat model includes an attacker who is not granted full filesystem access by a hosting provider, but can reconfigure the home directory of an FTP user.
- Published
- Apr 4, 2017
- Updated
- Jun 16, 2026
- EPSS
- 0.4% · 34th percentile
- CWE
- CWE-59
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| proftpd | proftpd | cpe:2.3:a:proftpd:proftpd |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- proftpd proftpdup to 1.3.5 inclusive
- proftpd proftpd1.3.6
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 1.3.5b-4 | 1.3.5b-4 |
| openSUSE:Tumbleweed | proftpd | before 1.3.6e-1.10 | 1.3.6e-1.10 |
| SUSE:Package Hub 15 | proftpd | before 1.3.5e-bp150.3.3.1 | 1.3.5e-bp150.3.3.1 |
| SUSE:Package Hub 15 | proftpd | before 1.3.6b-bp151.4.6.2 | 1.3.6b-bp151.4.6.2 |
| SUSE:Package Hub 15 | proftpd | before 1.3.6b-bp151.4.6.2 | 1.3.6b-bp151.4.6.2 |
| SUSE:Package Hub 15 | proftpd | before 1.3.5e-bp150.3.3.1 | 1.3.5e-bp150.3.3.1 |
| SUSE:Package Hub 15 SP1 | proftpd | before 1.3.5e-bp151.4.3.1 | 1.3.5e-bp151.4.3.1 |
Same product
proftpd: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-3306The mod_copy module in ProFTPD 1.3.5 allows remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands.69This week
- CVE-2010-4221Multiple stack-based buffer overflows in the pr_netio_telnet_gets function in netio.c in ProFTPD before 1.3.3c allow remote attackers to exe67This week
- CVE-2019-12815An arbitrary file copy vulnerability in mod_copy in ProFTPD up to 1.3.5b allows for remote code execution and information disclosure without56Plan
- CVE-2011-4130Use-after-free vulnerability in the Response API in ProFTPD before 1.3.3g allows remote authenticated users to execute arbitrary code via ve40Plan
- CVE-2010-20103ProFTPD 1.3.3c Backdoor Command Execution39Monitor
- CVE-2020-9273In ProFTPD 1.3.7, it is possible to corrupt the memory pool by interrupting the data transfer channel.39Monitor
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-dfsg | 1.3.5b-4 · Debian:12 | Package registry (OSV) |
| opensuse:proftpd | 1.3.5e-bp150.3.3.1 · openSUSE:Leap 15.0 | Package registry (OSV) |
| suse:proftpd | 1.3.5e-bp150.3.3.1 · SUSE:Package Hub 15 | 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.
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).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-59 · Improper Link Resolution Before File Access ('Link Following')CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
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.
Attack patterns (CAPEC)
ATT&CK techniques
- Obfuscated Files or Information: HTML SmugglingT1027.006
- Obfuscated Files or Information: Embedded PayloadsT1027.009
- Boot or Logon Autostart Execution:Shortcut ModificationT1547.009
- Hide Artifacts: Resource ForkingT1564.009
- Hijack Execution Flow: Executable Installer File Permissions WeaknessT1574.005
- Hijack Execution Flow: Services File Permissions WeaknessT1574.010
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- bugs.proftpd.org/show_bug.cgi?id=4295
- lists.opensuse.org/opensuse-security-announce/2019-08/msg00004.html
- lists.opensuse.org/opensuse-security-announce/2019-08/msg00022.html
- lists.opensuse.org/opensuse-security-announce/2020-01/msg00009.html
- www.securityfocus.com/bid/97409
- github.com/proftpd/proftpd/commit/ecff21e0d0e84f35c299ef91d7fda088e516d4ed
- github.com/proftpd/proftpd/commit/f59593e6ff730b832dbe8754916cb5c821db579f
- github.com/proftpd/proftpd/pull/444/commits/349addc3be4fcdad9bd4ec01ad1ccd916c898ed8
Vendor advisories and official records. Exploit/PoC links are deliberately left out.