CVE-2018-4939
Published: November 3, 2021
Official Description
Adobe ColdFusion contains a deserialization of untrusted data vulnerability that could allow for code execution.
CISA KEV Advisory
Adobe ColdFusion Deserialization of Untrusted Data Vulnerability
Adobe ColdFusion contains a deserialization of untrusted data vulnerability that could allow for code execution.
Apply updates per vendor instructions.
Risk Analysis
Adobe ColdFusion is vulnerable to deserialization of untrusted data, which can lead to code execution. This is a high-severity flaw with an EPSS score of 0.76803, indicating a high likelihood of exploitation, and it is confirmed to be exploited in the wild.
This vulnerability is actively exploited in the wild and is part of CISA's Known Exploited Vulnerabilities Catalog. Exploitation typically involves sending specially crafted serialized data to the ColdFusion server.
Administrators should apply the latest security updates for Adobe ColdFusion to mitigate this deserialization vulnerability. Implement secure coding practices and validate all input to prevent untrusted data from being processed.
Technical Analysis
CVE-2018-4939 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2018-4939 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2018-4939 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1