CVE-2015-5123VulnerabilityPublished 04/13/2022Updated 10/24/2026

CVE-2015-5123: Adobe Flash Player Use-After-Free Vulnerability

Affects Adobe Flash PlayerSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 04/13/2022
KEV deadline: 05/04/2022
EPSS: 18.8% chance of exploitation in 30 days – higher than 97% of CVEs

What to do

CISA required action

The impacted product is end-of-life and should be disconnected if still in use.

nvd.nist.gov/vuln/detail/CVE-2015-5123 (opens in a new tab)

Description

CVE-2015-5123 is a use-after-free vulnerability in the BitmapData class of Adobe Flash Player's ActionScript 3 implementation. This flaw allows remote attackers to execute arbitrary code or cause a denial-of-service (DoS) condition. The vulnerability has been exploited in the wild. No specific affected versions or patch information is provided in the available data.

Summary

This vulnerability involves a use-after-free condition in the BitmapData class within the ActionScript 3 (AS3) implementation of Adobe Flash Player. Exploitation can lead to remote code execution or denial-of-service attacks. The vulnerability has been observed in active exploitation campaigns, indicating real-world risk. However, no explicit patch or remediation details are provided in the source data.

Impact

Successful exploitation can result in remote code execution, allowing attackers to run arbitrary code on affected systems, or cause denial-of-service conditions by crashing the Flash Player process. This poses a significant security risk to users running vulnerable versions of Adobe Flash Player.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Due to the lack of explicit patch information, users should verify with Adobe's official security advisories for updates or fixes. Until a patch is confirmed, consider disabling or restricting Flash Player usage to mitigate risk.

Weaknesses

CWE-416Use After Free (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 11:26:33 UTC

Weaknesses

References

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