CVE-2023-23915

Name: CVE-2023-23915
Creator: NVD / NIST
Published: 2023-02-23T20:15:13.703+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.86%

Last modified Jun 17, 2026

CVE-2023-23915 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality to behave incorrectly when multiple URLs are requested in parallel. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. EPSS estimates a 0.86% chance of exploitation in the next 30 days.

Description

A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality to behave incorrectly when multiple URLs are requested in parallel. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. This HSTS mechanism would however surprisingly fail when multiple transfers are done in parallel as the HSTS cache file gets overwritten by the most recentlycompleted transfer. A later HTTP-only transfer to the earlier host name would then *not* get upgraded properly to HSTS.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.86%

53.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Haxx	Curl	>= 7.77.0, < 7.88.0
Netapp	Active Iq Unified Manager	All versions
Netapp	Clustered Data Ontap	9.0
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/1826048Not Applicable
https://security.gentoo.org/glsa/202310-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20230309-0006/Third Party Advisory
https://hackerone.com/reports/1826048Not Applicable
https://security.gentoo.org/glsa/202310-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20230309-0006/Third Party Advisory

Timeline

Published: Feb 23, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-23915?

How severe is CVE-2023-23915?

CVE-2023-23915 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.86% probability of exploitation in the next 30 days.

How do I fix CVE-2023-23915?

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-2023-23915?

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

Scan your code now

Source: NVD / NIST