Description
ProFTPD before 1.3.6b and 1.3.7rc before 1.3.7rc2 allows remote unauthenticated denial-of-service due to incorrect handling of overly long commands because main.c in a child process enters an infinite loop.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | proftpd-dfsg | 1.3.6a-2 | — |
| Debian 13 | proftpd-dfsg | 1.3.6a-2 | — |
| Debian 12 | proftpd-dfsg | 1.3.6a-2 | — |
| Debian 10 | proftpd-dfsg | 1.3.6-4+deb10u2 | DSA-4559-1 |
| Debian 9 | proftpd-dfsg | 1.3.5b-4+deb9u2 | DSA-4559-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | proftpd-dfsg | 1.3.5e+r1.3.5-2+deb8u4 | DLA-1974-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | proftpd-dfsg | No fix yet | — |
| Ubuntu 26.04 LTS | proftpd-dfsg | No fix yet | — |
| Ubuntu 25.10 | proftpd-dfsg | No fix yet | — |
| Ubuntu 24.04 LTS | proftpd-dfsg | No fix yet | — |
| Ubuntu 22.04 LTS | proftpd-dfsg | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | proftpd-dfsg | No fix yet | — |
| Ubuntu 18.04 LTS | proftpd-dfsg | No fix yet | — |
| Ubuntu 16.04 LTS | proftpd-dfsg | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 15 SP1 | proftpd | 1.3.6b-bp151.4.6.2 | openSUSE-SU-2020:0031-1 |
| SUSE Package Hub 15 | proftpd | 1.3.6b-bp151.4.6.2 | openSUSE-SU-2020:0031-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | proftpd | 1.3.6e-1.10 | openSUSE-SU-2024:11196-1 |
| openSUSE Leap 15.1 | proftpd | 1.3.6b-bp151.4.6.2 | openSUSE-SU-2020:0031-1 |
Automated scanner template
A ready-made Nuclei template detects this vulnerability automatically. Vulnerabilities with public scanner templates are typically probed across the internet soon after the template appears — exposed systems should be patched first.
- ProFTPD < 1.3.6b - Remote Unauthenticated DoS network/cves/2019/CVE-2019-18217.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Advisories 5
- DSA-4559-1 proftpd-dfsg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1974-1 proftpd-dfsg - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2020:0031-1 Security update for proftpd SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:11196-1 proftpd-1.3.6e-1.10 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-20-042-03 Siemens SIMATIC CP 1543-1 CISA ICS & IT advisories · Feb 11, 2020
References
- https://github.com/proftpd/proftpd/issues/846
- https://github.com/proftpd/proftpd/blob/master/RELEASE_NOTES
- https://github.com/proftpd/proftpd/blob/1.3.6/RELEASE_NOTES
- https://github.com/proftpd/proftpd/blob/master/NEWS
- https://github.com/proftpd/proftpd/blob/1.3.6/NEWS
- [debian-lts-announce] 20191027 [SECURITY] [DLA 1974-1] proftpd-dfsg security update mailing-list
- FEDORA-2019-ae019c7e9f vendor-advisory
- FEDORA-2019-848e410cfb vendor-advisory
- FEDORA-2019-7559f29ace vendor-advisory
- 20191106 [SECURITY] [DSA 4559-1] proftpd-dfsg security update mailing-list
- DSA-4559 vendor-advisory
- openSUSE-SU-2020:0031 vendor-advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-940889.pdf
- GLSA-202003-35 vendor-advisory