Epic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service (CPU consumption or crash) and possibly execu
Epic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service (CPU consumption or crash) and possibly execute arbitrary code via (1) a packet with a negative size value, which is treated as a large positive number during memory allocation, or (2) a negative size value in a package file.
- Published
- Dec 31, 2003
- Updated
- Jun 16, 2026
- EPSS
- 7.5% · 94th percentile
- CWE
- CWE-94
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Report tools
Action score
42
Plan
Add it to your regular patch cycle.
- CVSS
- 40 / 40 · 10.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 2 / 30 · 7.5%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| epic games | unreal engine | cpe:2.3:a:epic_games:unreal_engine |
| epic games | unreal tournament 2003 | cpe:2.3:a:epic_games:unreal_tournament_2003 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- epic games unreal engine226f
- epic games unreal engine433
- epic games unreal engine436
- epic games unreal tournament 20032199_linux
- epic games unreal tournament 20032199_win32
- epic games unreal tournament 2003demo_version_2206_linux
- epic games unreal tournament 2003demo_version_2206_win32
Same product
epic games: all recordsOther highest-scoring records for the same primary product.
- CVE-2003-1431Buffer overflow in Epic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service (crash) via a long host st30Monitor
- CVE-2004-1805Format string vulnerability in games using the Epic Games Unreal Engine 436 allows remote attackers to cause a denial of service (crash) and22Monitor
- CVE-2007-4442Stack-based buffer overflow in the logging function in the Unreal engine, possibly 2003 and 2004, as used in the internal web server, allows21Monitor
- CVE-2007-4443The UCC dedicated server for the Unreal engine, possibly 2003 and 2004, on Windows allows remote attackers to cause a denial of service (con21Monitor
- CVE-2004-1958Directory traversal vulnerability in manifest.ini in Unreal engine allows remote attackers to overwrite arbitrary files via ..21Monitor
- CVE-2003-1433Epic Games Unreal Engine 226f through 436 does not validate the challenge key, which allows remote attackers to exhaust the player limit by 17Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- C · data can be read
- Integrity
- C · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- C
- Integrity impact
- C
- Availability impact
- C
Weakness class (CWE)
CWE-94 · Improper Control of Generation of Code ('Code Injection')CVSS vector
AV:N/AC:L/Au:N/C:C/I:C/A:C
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- archives.neohapsis.com/archives/bugtraq/2003-02/0063.html
- archives.neohapsis.com/archives/bugtraq/2003-02/0142.html
- archives.neohapsis.com/archives/bugtraq/2003-05/0142.html
- exchange.xforce.ibmcloud.com/vulnerabilities/11302
- exchange.xforce.ibmcloud.com/vulnerabilities/11305
- exchange.xforce.ibmcloud.com/vulnerabilities/12012
Vendor advisories and official records. Exploit/PoC links are deliberately left out.