Description
An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Published: 2023-03-30
Score: 7.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3398-1 curl security update
EUVD EUVD EUVD-2023-31293 An authentication bypass vulnerability exists in libcurl prior to v8.0.0 where it reuses a previously established SSH connection despite the fact that an SSH option was modified, which should have prevented reuse. libcurl maintains a pool of previously used connections to reuse them for subsequent transfers if the configurations match. However, two SSH settings were omitted from the configuration check, allowing them to match easily, potentially leading to the reuse of an inappropriate connection.
Ubuntu USN Ubuntu USN USN-5964-1 curl vulnerabilities
History

Mon, 09 Jun 2025 15:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'}


Subscriptions

Broadcom Brocade Fabric Operating System Firmware
Debian Debian Linux
Fedoraproject Fedora
Haxx Libcurl
Netapp Active Iq Unified Manager Clustered Data Ontap H300s H300s Firmware H410s H410s Firmware H500s H500s Firmware H700s H700s Firmware
Redhat Enterprise Linux
Splunk Universal Forwarder
cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2025-06-09T14:52:08.739Z

Reserved: 2023-03-02T00:00:00.000Z

Link: CVE-2023-27538

cve-icon Vulnrichment

Updated: 2024-08-02T12:16:35.616Z

cve-icon NVD

Status : Modified

Published: 2023-03-30T20:15:07.677

Modified: 2025-06-09T15:15:29.150

Link: CVE-2023-27538

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-03-20T00:00:00Z

Links: CVE-2023-27538 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses