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CVE-2021-42697

7.5 · HIGH

Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a…

Published Nov 2, 2021CWE-674EPSS 36.14%

Overview

CVE-2021-42697 is a high-severity vulnerability. It was published on November 2, 2021 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

Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments.

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

Refpacketstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.htmlRefakka.io/blog/Refakka.io/blog/news/2021/11/02/akka-http-10.2.7-releasedRefakka.io/blog/news/2021/11/22/akka-http-10.1.15-releasedRefdoc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.htmlRefpacketstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.htmlRefakka.io/blog/Refakka.io/blog/news/2021/11/02/akka-http-10.2.7-releasedRefakka.io/blog/news/2021/11/22/akka-http-10.1.15-releasedRefdoc.akka.io/docs/akka-http/current/security/2021-CVE-2021-42697-stack-overflow-parsing-user-agent.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-42697?

CVE-2021-42697 is a high-severity vulnerability. It was published on November 2, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2021-42697?

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-2021-42697?

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-2021-42697?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-42697 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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