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CVE-2023-27537

5.9 · MEDIUM

A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles".

Published Mar 30, 2023CWE-415EPSS 1.90%

Overview

CVE-2023-27537 is a medium-severity vulnerability. It was published on March 30, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

A double free vulnerability exists in libcurl <8.0.0 when sharing HSTS data between separate "handles". This sharing was introduced without considerations for do this sharing across separate threads but there was no indication of this fact in the documentation. Due to missing mutexes or thread locks, two threads sharing the same HSTS data could end up doing a double-free or use-after-free.

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

Refhackerone.com/reports/1897203Refsecurity.gentoo.org/glsa/202310-12Refsecurity.netapp.com/advisory/ntap-20230420-0010/Refhackerone.com/reports/1897203Refsecurity.gentoo.org/glsa/202310-12Refsecurity.netapp.com/advisory/ntap-20230420-0010/

How CyberStrike helps

Frequently asked questions

What is CVE-2023-27537?

CVE-2023-27537 is a medium-severity vulnerability. It was published on March 30, 2023 and has a CVSS 3.1 base score of 5.9 (MEDIUM).

How severe is CVE-2023-27537?

This vulnerability has a CVSS 3.1 base score of 5.9, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2023-27537?

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-2023-27537?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-27537 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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