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(computer science)
A weakness in a computing system that can result in harm to the system or its operations, especially when this weakness is exploited by a hostile person or organization or when it is present in conjunction with particular events or circumstances.


Vulgarity (See COARSENESS.)
warrior vulnerable only in his heel. [Gk. Myth.: Zimmerman, 4]
only vulnerable if not touching ground. [Gk. and Rom. Myth.: Hall, 151]
conquerable only with mistletoe. [Norse Myth.: Walsh Classical, 43]
Irish Achilles, killed through cunning Fionn’s deceit. [Irish Myth.: Jobes, 443; Parrinder, 79]
Maginot Line
French fortification zone along German border; thought impregnable before WWII. [Fr. Hist.: NCE, 1658]
strength derived from his hair; betrayed by Delilah. [O.T.: Judges 16]
vulnerable in only one spot on his back. [Ger. Opera: Wagner, Götterdämmerung, Westerman, 245]
Siegfried Line
German fortification zone opposite the Maginot Line between Germany and France. [Ger. Hist.: WB, 17: 370]
invulnerable except for Kryptonite. [TV: “The Adventures of Superman” in Terrace, I, 38; Comics: Horn, 642]


A security exposure in an operating system or other system software or application software component. Before the Internet became mainstream and exposed every organization in the world to every attacker on the planet, vulnerabilities surely existed, but were not as often exploited.

In light of this madness, mostly perpetrated against Microsoft products, the architecture of future operating systems has changed. Designing software to be bulletproof against attacks is like building a house where every square inch is fortified with steel and sensors that detect intrusions. Patching an existing operating system written by hundreds of programmers who were not dwelling on this issue when they wrote the code is an onerous job.

Security firms maintain databases of vulnerabilities based on version number of the software. If exploited, each vulnerability can potentially compromise the system or network. To search for vulnerabilities and exposures in the National Vulnerability Database (NVD), visit See network security scanner and vulnerability disclosure.
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Through initiatives like DVLabs, TippingPoint is able to provide timely discovery, comprehensive development, and rapid delivery of vulnerability remediation to its enterprise customers.
The most popular exploit used on the Internet to infect Web browsers with malware was for Microsoft's MS-ITS vulnerability (MS04-013), disclosed in 2004.
Database vulnerability scanners help IT organizations simultaneously meet security and compliance requirements," said Andrew Jaquith, Senior Analyst at Yankee Group.
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