CVE-2023-27537

Name: CVE-2023-27537
Creator: NVD / NIST
Published: 2023-03-30T20:15:07.617+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.9/10EPSS 1.86%

Last modified Jun 17, 2026

CVE-2023-27537 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 1.86% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

1.86%

76.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Haxx	Libcurl	7.88.0
Haxx	Libcurl	7.88.1
Netapp	Active Iq Unified Manager	All versions
Netapp	Clustered Data Ontap	9.0
Broadcom	Brocade Fabric Operating System Firmware	All versions
Netapp	H300s Firmware	All versions
Netapp	H500s Firmware	All versions
Netapp	H700s Firmware	All versions
Netapp	H410s Firmware	All versions
Splunk	Universal Forwarder	>= 8.2.0, < 8.2.12
Splunk	Universal Forwarder	>= 9.0.0, < 9.0.6
Splunk	Universal Forwarder	9.1.0

References

https://hackerone.com/reports/1897203Exploit, Third Party Advisory
https://security.gentoo.org/glsa/202310-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory
https://hackerone.com/reports/1897203Exploit, Third Party Advisory
https://security.gentoo.org/glsa/202310-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20230420-0010/Third Party Advisory

Timeline

Published: Mar 30, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-27537?

How severe is CVE-2023-27537?

CVE-2023-27537 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.86% probability of exploitation in the next 30 days.

How do I fix CVE-2023-27537?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-27537?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST