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CVE-2016-20013

7.5 · HIGH

sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption) because the algorithm's runtime is proportional to the square of the length of the password.

Published Feb 19, 2022CWE-770EPSS 2.17%

Overview

CVE-2016-20013 is a high-severity vulnerability. It was published on February 19, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

sha256crypt and sha512crypt through 0.6 allow attackers to cause a denial of service (CPU consumption) because the algorithm's runtime is proportional to the square of the length of the password.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refakkadia.org/drepper/SHA-crypt.txtRefpthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/Reftwitter.com/solardiz/status/795601240151457793Refakkadia.org/drepper/SHA-crypt.txtRefpthree.org/2018/05/23/do-not-use-sha256crypt-sha512crypt-theyre-dangerous/Reftwitter.com/solardiz/status/795601240151457793

How CyberStrike helps

Frequently asked questions

What is CVE-2016-20013?

CVE-2016-20013 is a high-severity vulnerability. It was published on February 19, 2022 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2016-20013?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-20013?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-20013?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-20013 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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