CVE-2021-35515 : What You Need to Know

Apache Commons Compress 1.6 to 1.20 denial of service vulnerability was discovered by OSS Fuzz. A specially crafted 7Z archive can trigger an infinite loop while constructing the list of codecs, leading to a denial of service attack.

Understanding CVE-2021-35515

This section delves into the nature of the CVE-2021-35515 vulnerability.

What is CVE-2021-35515?

CVE-2021-35515 involves a vulnerability in Apache Commons Compress versions 1.6 to 1.20, allowing an attacker to exploit a denial of service flaw through crafted 7Z archives.

The Impact of CVE-2021-35515

The vulnerability could be exploited to trigger an infinite loop when constructing a list of codecs, resulting in a denial of service attack against services using the Compress' sevenz package.

Technical Details of CVE-2021-35515

This section covers technical details regarding the CVE-2021-35515 vulnerability.

Vulnerability Description

Exploiting the flaw in Apache Commons Compress versions 1.6 to 1.20 allows threat actors to cause denial of service attacks via specially crafted 7Z archives.

Affected Systems and Versions

Apache Commons Compress versions 1.6 to 1.20 are affected by this vulnerability.

Exploitation Mechanism

Cybercriminals can exploit the vulnerability by using a specially crafted 7Z archive to trigger the infinite loop in codec list construction.

Mitigation and Prevention

In this section, discover the necessary steps to mitigate and prevent the CVE-2021-35515 vulnerability.

Immediate Steps to Take

Users of Apache Commons Compress are advised to upgrade to version 1.21 or later to mitigate the CVE-2021-35515 vulnerability.

Long-Term Security Practices

Regularly updating software and libraries, as well as staying informed about security patches, is crucial for long-term security.

Patching and Updates

Updating to Apache Commons Compress version 1.21 or higher is recommended to address the CVE-2021-35515 vulnerability.