CVE-2018-4878
Published: November 3, 2021
Official Description
Adobe Flash Player contains a use-after-free vulnerability that could allow for code execution.
CISA KEV Advisory
Adobe Flash Player Use-After-Free Vulnerability
Adobe Flash Player contains a use-after-free vulnerability that could allow for code execution.
The impacted product is end-of-life and should be disconnected if still in use.
Risk Analysis
Adobe Flash Player contains a use-after-free vulnerability that could allow for arbitrary code execution. This high-severity flaw, with an EPSS score of 0.93305 and inclusion in CISA's KEV, represents a critical and actively exploited risk.
This vulnerability is actively being exploited in the wild. The ability to achieve code execution remotely makes this a severe and immediate threat.
Users should update Adobe Flash Player to the latest secure version or, preferably, uninstall it as it is an end-of-life product. Ensure all web browsers and operating systems are updated.
Technical Analysis
CVE-2018-4878 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-2018-4878 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-2018-4878 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