CVE-1999-1505 in QuakeWorld
Summary
by MITRE
Buffer overflow in QuakeWorld 2.10 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary commands via a long initial connect packet.
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Analysis
by VulDB Data Team • 04/17/2026
The vulnerability identified as CVE-1999-1505 represents a critical buffer overflow flaw discovered in QuakeWorld version 2.10, a popular multiplayer first-person shooter game released in the late 1990s. This vulnerability resides within the game's network protocol handling mechanism, specifically during the initial connection process when clients communicate with game servers. The flaw stems from inadequate input validation and bounds checking in the client-side code that processes incoming connection packets from remote servers.
The technical implementation of this buffer overflow occurs when a remote attacker crafts a specially malformed initial connect packet containing excessive data beyond the allocated buffer size. When the vulnerable QuakeWorld client attempts to process this oversized packet during the connection handshake phase, it overwrites adjacent memory locations in the program's address space. This memory corruption typically manifests as an application crash or segmentation fault, resulting in immediate denial of service for legitimate users attempting to connect to the affected server.
From an operational perspective, this vulnerability presents significant risks to game server administrators and players alike. Attackers can exploit this flaw to disrupt gaming services by causing persistent server crashes and making games unplayable for legitimate users. The potential for arbitrary code execution adds an additional layer of severity, as successful exploitation could allow attackers to gain control over the affected system running the vulnerable QuakeWorld client. This makes the vulnerability particularly dangerous in environments where users might be unknowingly exposed to malicious servers or when the game is used in networked educational or corporate settings.
The vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and represents a classic example of improper input validation in network protocols. From the ATT&CK framework perspective, this vulnerability maps to techniques involving remote code execution and service disruption, specifically targeting the execution phase of attack chains. The flaw demonstrates how legacy network applications often lack proper security controls for handling untrusted network data, making them susceptible to exploitation by malicious actors.
Mitigation strategies for this vulnerability involve immediate patching of the QuakeWorld client software to address the buffer overflow condition through proper bounds checking and input validation. System administrators should implement network-level filtering to restrict connection attempts from untrusted sources and consider deploying intrusion detection systems to monitor for suspicious packet patterns. Additionally, users should avoid connecting to untrusted game servers and keep their software updated to prevent exploitation. The remediation approach should include thorough code review processes for network protocol implementations and implementation of defensive programming practices such as stack canaries and address space layout randomization to reduce exploitability.