CVE-2015-3306

CRITICALCISA KEVEPSS 100th pctl

10.0

CVSS v3

Description

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.

CWE-284Improper Access Control

How to fix

Remediation Available

proftpd-dfsgDebian

Fixed in:1.3.5-2CVE-2015-3306

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

98.03%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Remediation due: 2026-10-11

References

Exploit5

Third-Party Advisory9

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-284 (Improper Access Control) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-27350	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2019-1653	High	7.5	100%	KEV	-
CVE-2023-23752	Medium	5.3	100%	KEV	Fix
CVE-2023-29298	High	7.5	100%	KEV	-
CVE-2023-38205	High	7.5	100%	KEV	-
CVE-2024-27348	Critical	9.8	99%	KEV	Fix

Common questions

How do I fix CVE-2015-3306?

Upgrade proftpd-dfsg on debian 12 to 1.3.5-2 or later.

Is CVE-2015-3306 being actively exploited?

Yes. CVE-2015-3306 is listed in the CISA Known Exploited Vulnerabilities catalog, which means exploitation has been observed in the wild. US federal agencies were required to remediate it by 2026-10-11. Treat it as a priority whatever its CVSS score says.

How severe is CVE-2015-3306?

CVE-2015-3306 has a CVSS v3 base score of 10.0, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2015-3306 affect?

Published advisories record a fix for proftpd-dfsg (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This vulnerability is actively exploited in the wild

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-09.