ProFTPD Improper Access Control Vulnerability (CVE-2015-3306)
Severity: critical · Patch status: unknown · Since 2026-10-08 · CVE-2015-3306
ProFTPD contains an improper access control vulnerability that could allow remote attackers to read and write to arbitrary files via the site cpfr and site cpto commands. CISA added CVE-2015-3306 to its Known Exploited Vulnerabilities catalog on Oct 8, 2026, which means attackers are exploiting it in the wild.
What 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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
- US federal agencies must remediate by Oct 11, 2026 (BOD 22-01); treat that as the outer limit.
Sources
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