What is the CVSS score of log4j vulnerability?

Answered by James Kissner

The CVSS (Common Vulnerability Scoring System) score is a numerical value assigned to a vulnerability to assess its severity and impact on the security of a system. In the case of the Log4j vulnerability, also known as CVE-2021-44228 or Log4Shell, the CVSS score ranges from 9.0 to 10.0, which is classified as critical.

The Log4j vulnerability is a serious remote code execution (RCE) vulnerability that affects the Apache Log4j logging library. This library is widely used in many applications and systems, making this vulnerability a significant concern for organizations and individuals.

The CVSS score is determined based on various factors such as the exploitability of the vulnerability, the impact on the confidentiality, integrity, and availability of the affected system, and the complexity of the attack. The score is calculated using a formula that takes into account these factors and produces a numerical value between 0.0 and 10.0.

A CVSS score of 9.0 to 10.0 indicates that the vulnerability has a high potential for exploitation and can cause significant damage to the affected system. It implies that the vulnerability is relatively easy to exploit, may not require complex attack techniques, and can lead to severe consequences such as unauthorized access, data breaches, or even complete system compromise.

It is important to note that the Log4j vulnerability has gained widespread attention and urgency due to its potential for widespread impact. The vulnerability allows attackers to execute arbitrary code remotely by sending a specially crafted request to a vulnerable Log4j server. This means that an attacker could gain control over the affected system and potentially perform malicious actions, such as installing malware, exfiltrating sensitive data, or disrupting the normal operation of the system.

The severity of the Log4j vulnerability has prompted organizations and individuals to take immediate action to mitigate the risk. This includes updating to the latest patched versions of Log4j, implementing mitigations suggested by security experts, and monitoring for any signs of exploitation or unauthorized access.

The CVSS score for the Log4j vulnerability is critical, with a range of 9.0 to 10.0. This indicates the severity and potential impact of the vulnerability, emphasizing the need for prompt action to address and mitigate the risk it poses.