Known exploited vulnerability
CVE-2015-3306
The short answer
CVE-2015-3306 affects n/a n/a and is rated critical (CVSS 10.0). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-10-08: attackers are using it, so patch it first.
What it is
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.
Weakness: CWE-284.
Severity
10.0 critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Exploited (CISA KEV)
Yes, since Oct 8, 2026
Federal due date Oct 11, 2026
EPSS, next 30 days
99%
Higher than 100% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
What CISA says to do
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…
Affected products
n/a. NVD's record lists the exact affected versions.
References
- www.exploit-db.com/exploits/36742/ Exploit
- www.exploit-db.com/exploits/36803/ Exploit
- www.exploit-db.com/exploits/36742/ Exploit
- www.exploit-db.com/exploits/36803/ Exploit
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2015-3306 US Government Resource
Questions
Is CVE-2015-3306 being exploited?
Yes. CISA added CVE-2015-3306 to its Known Exploited Vulnerabilities catalog on 2026-10-08, with a federal remediation due date of 2026-10-11.
How do I fix CVE-2015-3306?
CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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