How severe is CVE-2003-1433?

CVE-2003-1433 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2003-1433 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-1433?

CVE-2003-1433 primarily affects Epic Games Unreal Engine. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-1433?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2003-1433 published?

CVE-2003-1433 was published on 2003-12-31 and last updated on 2026-06-16.

CVE-2003-1433

CVE-2003-1433 is a medium-severity vulnerability in Epic Games Unreal Engine with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 1% (64th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Epic Games Unreal Engine
Published: 2003-12-31
Last modified: 2026-06-16

Description

Epic Games Unreal Engine 226f through 436 does not validate the challenge key, which allows remote attackers to exhaust the player limit by joining the game multiple times.

Frequently asked questions

What is CVE-2003-1433?: Epic Games Unreal Engine 226f through 436 does not validate the challenge key, which allows remote attackers to exhaust the player limit by joining the game multiple times.
How severe is CVE-2003-1433?: CVE-2003-1433 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2003-1433 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (64th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-1433?: CVE-2003-1433 primarily affects Epic Games Unreal Engine. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-1433?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2003-1433 published?: CVE-2003-1433 was published on 2003-12-31 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:epic_games:unreal_engine:226f:*:*:*:*:*:*:*
cpe:2.3:a:epic_games:unreal_engine:433:*:*:*:*:*:*:*
cpe:2.3:a:epic_games:unreal_engine:436:*:*:*:*:*:*:*

More vulnerabilities in Epic Games Unreal Engine

CVE-2004-0608 — Critical (CVSS 10.0): The Unreal Engine, as used in DeusEx 1.112fm and earlier, Devastation 390 and earlier, Mobile Forces 20000 and earlier,…
CVE-2003-1432 — Critical (CVSS 10.0): Epic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service (CPU consumption or…
CVE-2003-1431 — High (CVSS 7.1): Buffer overflow in Epic Games Unreal Engine 226f through 436 allows remote attackers to cause a denial of service…
CVE-2007-4443 — Medium (CVSS 5.0): The UCC dedicated server for the Unreal engine, possibly 2003 and 2004, on Windows allows remote attackers to cause a…
CVE-2007-4442 — Medium (CVSS 5.0): Stack-based buffer overflow in the logging function in the Unreal engine, possibly 2003 and 2004, as used in the…
CVE-2004-1805 — Medium (CVSS 5.0): Format string vulnerability in games using the Epic Games Unreal Engine 436 allows remote attackers to cause a denial…

All CVEs affecting Epic Games Unreal Engine →

Other CWE-287 (Improper Authentication) vulnerabilities

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CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
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CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

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