Threats / Adobe / CVE-2015-5123
CVE-2015-5123
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Adobe Flash Player vulnerability
Use-after-free vulnerability in Adobe Flash Player's ActionScript 3 BitmapData class enables remote code execution or denial of service.
Verdict
Today item — known-exploited.
A use-after-free flaw in Flash Player's AS3 implementation allows attackers to execute arbitrary code or crash the application through crafted content. The vulnerability has been exploited in the wild.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
6 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-13).
Probability (EPSS)
EPSS 0.18493 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Adobe, Flash Player. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-416 Use After Free — weakness family: Memory safety.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft malicious Flash content that triggers improper memory handling in the BitmapData class.
Business
Users encounter compromised Flash content distributed via web pages or email attachments.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I deliver the malicious SWF file to target systems via web browsing or social engineering.
Business
Attack surface expands across web-based and email-delivered vectors with no user interaction required beyond normal browsing.
3
Lateral reach — past segmentation narrative 3
Attacker
I exploit the use-after-free condition to read or write memory, achieving code execution in the Flash Player process.
Business
Attackers gain execution context within the user's browser with Flash Player privileges.
4
Data at risk — exfiltration narrative 4
Attacker
I establish persistence or pivot to system-level compromise depending on browser sandbox effectiveness.
Business
Confidentiality, integrity, and availability of affected systems are compromised; data exfiltration or lateral movement becomes possible.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05