A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an attacker to pass on maliciously crafted user name and "telnet options" during server negotiation. The lack of proper input scrubbing allows an attacker to send content or perform option negotiation without the application's intent. This vulnerability could be exploited if an application allows user input, thereby enabling attackers to execute arbitrary code on the system.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3398-1 curl security update
Ubuntu USN Ubuntu USN USN-5964-1 curl vulnerabilities
Ubuntu USN Ubuntu USN USN-5964-2 curl vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Fri, 13 Feb 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: hackerone

Published:

Updated: 2026-02-13T20:09:17.704Z

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

Link: CVE-2023-27533

cve-icon Vulnrichment

Updated: 2024-08-02T12:16:35.624Z

cve-icon NVD

Status : Modified

Published: 2023-03-30T20:15:07.373

Modified: 2026-02-13T21:16:11.790

Link: CVE-2023-27533

cve-icon Redhat

Severity : Low

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

Links: CVE-2023-27533 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses