Description
An issue was discovered in Pure-FTPd 1.0.49. An uninitialized pointer vulnerability has been detected in the diraliases linked list. When the *lookup_alias(const char alias) or print_aliases(void) function is called, they fail to correctly detect the end of the linked list and try to access a non-existent list member. This is related to init_aliases in diraliases.c.
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 13 | pure-ftpd | 1.0.49-4 | — |
| Debian 12 | pure-ftpd | 1.0.49-4 | — |
| Debian 8 | pure-ftpd | 1.0.36-3.2+deb8u1 | DLA-2123-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | pure-ftpd | No fix yet | — |
| Ubuntu 16.04 LTS | pure-ftpd | 1.0.36-3.2+deb8u1build0.16.04.1 | USN-4515-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | pure-ftpd | 1.0.50-1.1 | openSUSE-SU-2024:11773-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.23 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.22 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.21 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.20 | pure-ftpd | 1.0.49-r1 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.18 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.17 | pure-ftpd | 1.0.49-r1 | — |
| Alpine v3.16 | pure-ftpd | 1.0.49-r1 | — |
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.
- Pure-FTPd ≤ 1.0.49 - DoS via Uninitialized Pointer network/cves/2020/CVE-2020-9274.yaml
Source: projectdiscovery/nuclei-templates (MIT) — updated daily. Only links are listed.
Advisories 3
- USN-4515-1 pure-ftpd vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-2123-1 pure-ftpd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11773-1 pure-ftpd-1.0.50-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/jedisct1/pure-ftpd/commit/8d0d42542e2cb7a56d645fbe4d0ef436e38bcefa
- https://www.pureftpd.org/project/pure-ftpd/news/
- [debian-lts-announce] 20200228 [SECURITY] [DLA 2123-1] pure-ftpd security update mailing-list
- GLSA-202003-54 vendor-advisory
- FEDORA-2020-5ac8d4c11a vendor-advisory
- FEDORA-2020-84fb0920fd vendor-advisory
- FEDORA-2020-fa83ea0492 vendor-advisory
- USN-4515-1 vendor-advisory