Code execution via forged ZScript actor states
Published Dec 3, 2025 · Updated Dec 3, 2025
Improper actor-state handling in GZDoom 4.14.2 and earlier allows local users to execute arbitrary code through crafted ZScript. ZScript can copy FState and VMFunction objects into a writable buffer, alter their function pointers and transitions, and redirect control flow into constants stored in JIT code. Exploitation requires user interaction with attacker-controlled script content and grants process-memory access and code execution in the host context.
Summary
What happened
Improper actor-state handling in GZDoom 4.14.2 and earlier allows local users to execute arbitrary code through crafted ZScript. ZScript can copy FState and VMFunction objects into a writable buffer, alter their function pointers and transitions, and redirect control flow into constants stored in JIT code. Exploitation requires user interaction with attacker-controlled script content and grants process-memory access and code execution in the host context.
The record
- CVE
- CVE-2025-54065
- Published
- Dec 3, 2025
- Updated
- Dec 3, 2025
- Vendor
- ZDoom
- Product
- GZDoom
- Classifications
- CWE-913, T1203
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Dec 3, 2025CVE publishedPublication date reported by the CVE source.
- Dec 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=<= 4.14.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- ZScript actor-state proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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