6.5

CVE-2023-23915: haxx curl

CVSS: 6.5v3.1MediumModified
AliasesALPINE-CVE-2023-23915UBUNTU-CVE-2023-23915DEBIAN-CVE-2023-23915
Published 23-02-2023Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2023-23915 is a medium (CVSS 6.5) vulnerability in haxx curl. EPSS estimates a 0.88% chance of exploitation in the next 30 days, higher than 58.4% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.88%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 3
OPENSUSE-SU-2024:12735-1RHSA-2023:3354SUSE-SU-2023:0429-1USN-5891-1

Timeline

  1. 23-02-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.88%

Chance of exploitation in the next 30 days

Percentile

58%

Versus all other CVEs

30-day change

+0.02 pp

From 0.86% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.88%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Netapp6 products
Alpine1 product
  • curl≥ 7.77.0, < 7.79.1-r5 | ≥ 7.77.0, < 7.80.0-r6 | ≥ 7.77.0, < 7.83.1-r6 | ≥ 7.77.0, < 7.87.0-r2 | ≥ 7.77.0, < 7.88.0-r0
Chainguard1 product
  • libcurl4All versions (No fix recorded)
Debian1 product
  • curl< 7.88.1-1
Haxx1 product
  • curl≥ 7.77.0, < 7.88.0
Splunk1 product
Ubuntu1 product
  • curl< 7.81.0-1ubuntu1.8
Wolfi1 product
  • libcurl4All versions (No fix recorded)

8 vendors · 13 products

References

11 links
Show all 11 references