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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2018-4939

Adobe ColdFusion Deserialization of Untrusted Data Vulnerability

Adobe ColdFusion

Adobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability. Successful exploitation could lead to arbitrary code execution.

CVSS
9.8
CRITICAL
EPSS
62%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
19 May 2018
CWE-502

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 3 November 2021. US federal agencies were required to remediate it by 3 May 2022.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 62%, which is higher than 99.2% 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-2018-4939 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2018-4939.

What does CVE-2018-4939 affect?

CVE-2018-4939 affects Adobe ColdFusion. Adobe ColdFusion Update 5 and earlier versions, ColdFusion 11 Update 13 and earlier versions have an exploitable Deserialization of Untrusted Data vulnerability. Successful exploitation could lead to arbitrary code execution.

How severe is CVE-2018-4939?

CVE-2018-4939 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 62%, higher than 99.2% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 3 May 2022.

How should organisations respond to CVE-2018-4939?

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.