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In computer security, a vulnerability is a weakness which allows an attacker to reduce a system’s information assurance. Vulnerability is the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw. To exploit a vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness. In this frame, vulnerability is also known as the attack surface.

Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities. This practice generally refers to software vulnerabilities in computing systems.

A security risk may be classified as a vulnerability. The use of vulnerability with the same meaning of risk can lead to confusion. The risk is tied to the potential of a significant loss. Then there are vulnerabilities without risk: for example when the affected asset has no value. A vulnerability with one or more known instances of working and fully implemented attacks is classified as an exploitable vulnerability — a vulnerability for which an exploit exists. The window of vulnerability is the time from when the security hole was introduced or manifested in deployed software, to when access was removed, a security fix was available/deployed, or the attacker was disabled—see zero-day attack.

Security bug (security defect) is a narrower concept: there are vulnerabilities that are not related to software: hardware, site, personnel vulnerabilities are examples of vulnerabilities that are not software security bugs.

Constructs in programming languages that are difficult to use properly can be a large source of vulnerabilities.

TeamViewer says it has issued a hotfix to address a bug that allows users sharing a desktop session to gain control of the other’s computer without permission.
A proof of concept attack developed by researchers target users of the development platforms for Android and Java.
Google beefs up privacy protections on apps distributed via third-party Android marketplaces and Google Play that that collect personal data without user consent.
Researchers have found a variant of Ursnif Trojan they said is a “v3 build” that targets Australian bank customers with new redirection attack techniques.
Researchers have found a flaw in the original fix for the Dirty COW vulnerability patched in October 2016.
A Cisco Systems security advisory is urges users of its WebEx platform to patch six vulnerabilities that could allow attackers to execute remote code.
Researchers say a new remote access Trojan dubbed UBoatRAT is targeting individuals or organizations linked to South Korea or video games industry.
A vulnerability in the Local Packet Transport Servicesnbsp;(LPTS) ingress frame-processing functionality of Cisconbsp;IOS XR Software could allow an unauthenticated, remote attacker to cause one of the LPTS processes on an affected system to rest...
A vulnerability in Cisconbsp;NX-OS System Software running on Cisconbsp;MDS Multilayer Director Switches, Cisconbsp;Nexus 7000 Series Switches, and Cisconbsp;Nexus 7700 Series Switches could allow an authenticated, local attacker to access the ...
A vulnerability in Cisco WebEx Meeting Server could allow an unauthenticated, remote attacker to modify the welcome message of a meeting on an affected system. The vulnerability is due to insufficient security settings on meetings.

An attacker cou...
A vulnerability in Cisco NX-OS System Software could allow an authenticated, local attacker to bypass signature verification when loading a software image. The vulnerability is due to insufficient NX-OS signature verification for software images. ...
A vulnerability in the CLI of Cisco NX-OS System Software could allow an authenticated, local attacker to perform a command injection attack. An attacker would need valid administrator credentials to perform this exploit. The vulnerability is due...