What’s Vulnerable › Vulnerabilities

CVE-2023-23914

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-23 · updated 2026-10-14
• Weakness: CWE-319

Description

A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality fail when multiple URLs are requested serially. Using its HSTS support, curl can be instructed to use HTTPS instead of usingan insecure clear-text HTTP step even when HTTP is provided in the URL. ThisHSTS mechanism would however surprisingly be ignored by subsequent transferswhen done on the same command line because the state would not be properlycarried on.

Affected products

• curl: from 7.77.0 before 7.88.0 — fixed in 7.88.0
• Active IQ Unified Manager for VMware vSphere, Linux, and Microsoft Windows: all versions
• Clustered Data ONTAP: 9.0
• NetApp H300S Firmware: all versions
• NetApp H410S Firmware: all versions
• NetApp H500S Firmware: all versions
• NetApp H700S Firmware: all versions
• Splunk Universal Forwarder: from 8.2.0 before 8.2.12; from 9.0.0 before 9.0.6; 9.1.0 — fixed in 8.2.12, 9.0.6

How to fix

Upgrade to a fixed version: curl 7.88.0; Splunk Universal Forwarder 8.2.12, 9.0.6. Check the vendor advisory for mitigations.

References

• https://hackerone.com/reports/1813864
• https://security.gentoo.org/glsa/202310-12
• https://security.netapp.com/advisory/ntap-20230309-0006/
• https://hackerone.com/reports/1813864
• https://security.gentoo.org/glsa/202310-12
• https://security.netapp.com/advisory/ntap-20230309-0006/
• https://cert-portal.siemens.com/productcert/html/ssa-398330.html

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