Common Vulnerabilities and Exposures (CVE) is a publicly listed catalog of known security threats maintained by the United States Department of Homeland Security (DHS). The catalog is divided into two categories: vulnerabilities and exposures. The purpose of the CVE is to provide a standardized way of identifying and disclosing cybersecurity vulnerabilities.
Vulnerabilities in the context of CVE refer to flaws in software, firmware, hardware, or service components that can be exploited by cybercriminals or other threat actors. These vulnerabilities, if left unaddressed, can have a negative impact on the confidentiality, integrity, and availability of the affected component, potentially hindering an organization’s operations or data. It is crucial for organizations to eliminate these vulnerabilities through appropriate security measures.
The main goal of the CVE is to standardize the identification of each known vulnerability or exposure. By assigning a unique identification number (CVE ID) to each vulnerability, security administrators can quickly access technical information about a specific threat across multiple CVE-compatible information sources. This allows IT and cybersecurity specialists to understand, prioritize, and address vulnerabilities within their organizations.
The CVE is supported by the MITRE Corporation and the DHS’s Cybersecurity and Infrastructure Security Agency (CISA). The catalog provides comprehensive information about each vulnerability, including a description and one or more public references. Hundreds or thousands of CVE IDs are issued every year to account for the constantly increasing number of new vulnerabilities being discovered.
To quantify the severity of a vulnerability, the Common Vulnerability Scoring System (CVSS) is used. CVSS provides a systematic method for understanding vulnerabilities and assigning them a numerical score based on their severity. The U.S. National Vulnerability Database (NVD) offers a CVSS calculator that enables security teams to create severity rating scores and prioritize CVE records. This helps in assessing and improving vulnerability management abilities.
It is important to note that CVE is different from Common Weakness Enumeration (CWE). CWE is a catalog of various types of software and hardware weaknesses that may lead to the introduction of vulnerabilities. Unlike CVE, CWE acts as a dictionary that enumerates flaws in software/hardware architecture, design, code, or implementation. Once these weaknesses are known, they are documented in the CWE and may eventually make their way into the CVE.
The responsibility of assigning CVE IDs and publishing CVE records lies with the CVE numbering authority (CNA). A CNA can be any entity, such as a vendor, researcher, bug bounty provider organization, or Computer Emergency Response Team, that is authorized by the CVE program to assign IDs and publish records. A CNA must have a public vulnerability disclosure policy and a public source for new vulnerability disclosures to be authorized.
To ensure effective governance and coordination, the CVE program includes the concept of a Root organization. A Root organization is authorized to recruit, train, and govern one or more CNAs or other Roots. A Top-Level Root (TL-Root) is a Root organization that does not report to another Root and is solely responsible to the CVE Board.
In conclusion, the Common Vulnerabilities and Exposures (CVE) catalog plays a vital role in standardizing the identification and disclosure of cybersecurity vulnerabilities. It enables security teams to understand and prioritize threats, leading to effective vulnerability management and mitigation strategies. Through the use of unique identification numbers and the Common Vulnerability Scoring System (CVSS), organizations can assess the severity of vulnerabilities and take appropriate measures to protect their systems and data.