CVE-2017-3066
Adobe ColdFusion Deserialization Vulnerability
Adobe ColdFusion
Adobe ColdFusion 2016 Update 3 and earlier, ColdFusion 11 update 11 and earlier, ColdFusion 10 Update 22 and earlier have a Java deserialization vulnerability in the Apache BlazeDS library. Successful exploitation could lead to arbitrary code execution.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 24 February 2025. US federal agencies were required to remediate it by 17 March 2025.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 90.6%, which is higher than 99.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2017-3066 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2017-3066.
What does CVE-2017-3066 affect?
CVE-2017-3066 affects Adobe ColdFusion. Adobe ColdFusion 2016 Update 3 and earlier, ColdFusion 11 update 11 and earlier, ColdFusion 10 Update 22 and earlier have a Java deserialization vulnerability in the Apache BlazeDS library. Successful exploitation could lead to arbitrary code execution.
How severe is CVE-2017-3066?
CVE-2017-3066 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 90.6%, higher than 99.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 17 March 2025.
How should organisations respond to CVE-2017-3066?
Apply the vendor patch for Adobe ColdFusion as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.