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Vulnerabilities

Vulnerability · CVE-2023-27537

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

Published Mar 30, 2023 · catalog updated Oct 14, 2026 · A double free vulnerability

Check if you run it

No confirmed exploitation is on record for CVE-2023-27537. EPSS is 1.90%. Act only if a listed version of A double free vulnerability is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (A double free vulnerability).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium5.9
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.90%
Remediation
Advisory link
Affected products
cpe broadcom/brocade fabric operating system firmware · cpe haxx/libcurl · cpe netapp/active iq unified manager · cpe netapp/clustered data ontap · cpe netapp/h300s firmware · cpe netapp/h410s firmware

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe broadcom/brocade fabric operating system firmwareversion unspecified
  • cpe haxx/libcurl7.88.0
  • cpe haxx/libcurl7.88.1
  • cpe netapp/active iq unified managerversion unspecified
  • cpe netapp/clustered data ontap9.0
  • cpe netapp/h300s firmwareversion unspecified
  • cpe netapp/h410s firmwareversion unspecified
  • cpe netapp/h500s firmwareversion unspecified
  • cpe netapp/h700s firmwareversion unspecified
  • cpe splunk/universal forwarderversion unspecified

How to fix CVE-2023-27537

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2023-27537. EPSS is 1.90%. Act only if a listed version of A double free vulnerability is installed.

Which versions are affected?

Compare what you have installed with netapp/clustered data ontap 9.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-415: Double Free. EPSS 1.90%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 30, 2023 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2023-27537

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-27537

    30-day exploitation probability 1.9%

    first.org
  • NIST NVDVulnerability recordCVE-2023-27537

    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 mut

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.