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CVE-2015-3306: ProFTPD Improper Access Control Vulnerability

100
Patch now
CRITICAL 10.0EXPLOITEDREMOTEWATCHLISTMITIGATEMITIGATEMITIGATE

CVE-2015-3306 is a critical-severity flaw (CVSS 10.0) affecting fedora, debian linux, tumbleweed, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The 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.

Why this priority

  • Critical severity
  • EPSS top 1%: very likely to be exploited
  • Exploited in the wild (CISA KEV)
  • Public exploit reference
  • CISA SSVC: automatable with total technical impact
  • Remotely exploitable, no login, no user action
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score10.0 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance99.5% (top 1%)
CISA exploited listYes, fix due 2026-10-11
WeaknessCWE-284
Published2015-05-18
Last modified2026-10-09
Publisher (CNA): MITRE · Vendor: debian · fedoraproject · opensuse · proftpd · suse

Am I affected?

Timeline

fedoraproject fedora MITIGATE
Affected: 20 · 21 · 22
Fixed in: no fixed release known
Safe to downgrade to: a release before 20
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
debian debian linux MITIGATE
Affected: 7.0 · 8.0 · 9.0
Fixed in: no fixed release known
Safe to downgrade to: a release before 7.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opensuse tumbleweed MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
suse linux enterprise server MITIGATE
Affected: 15 sp7
Fixed in: no fixed release known
Safe to downgrade to: a release before 15
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
suse linux enterprise server MITIGATE
Affected: 15 sp7
Fixed in: no fixed release known
Safe to downgrade to: a release before 15
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
proftpd proftpd DOWNGRADE
Affected: 1.3.5
Fixed in: no fixed release known
Safe to downgrade to: a release before 1.3.5
1. Check installed version
apt-cache policy proftpd || rpm -q proftpd || proftpd --version
2. No fixed release: DOWNGRADE to a release before 1.3.5 (Debian / Ubuntu)
apt-cache madison proftpd sudo apt install proftpd=<VERSION_BEFORE_1.3.5> sudo apt-mark hold proftpd
2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list proftpd sudo dnf downgrade proftpd-<VERSION_BEFORE_1.3.5> sudo dnf versionlock add proftpd
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · uv · FIXED · 0.13.5-1.fc46 · FEDORA-2026-61ea5a28c6 · source
sudo dnf upgrade --advisory=FEDORA-2026-61ea5a28c6
Debian 12 · proftpd-dfsg · FIXED · 1.3.5-2
sudo apt update && sudo apt install --only-upgrade proftpd-dfsg dpkg --compare-versions "$(dpkg-query -W -f='${Version}' proftpd-dfsg)" ge "1.3.5-2" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · proftpd-dfsg · FIXED · 1.3.5-2
sudo apt update && sudo apt install --only-upgrade proftpd-dfsg dpkg --compare-versions "$(dpkg-query -W -f='${Version}' proftpd-dfsg)" ge "1.3.5-2" && echo PATCHED || echo STILL-VULNERABLE

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

References

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