CVE-2023-27533: Fedoraproject Fedora

High severity, CVSS 8.8. EPSS: 2% chance of exploitation in the next 30 days.

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.

Affected products

• Fedoraproject Fedora: version 36 only
• Haxx Curl: from 7.0.0, up to and including 7.881
• Netapp Active Iq Unified Manager: affected versions not specified
• Netapp Clustered Data Ontap: version 9.0 only
• Netapp h300s Firmware: affected versions not specified
• Netapp h410s Firmware: affected versions not specified
• Netapp h500s Firmware: affected versions not specified
• Netapp h700s Firmware: affected versions not specified
• Splunk Universal Forwarder: from 8.2.0, before 8.2.12 (fixed in 8.2.12); from 9.0.0, before 9.0.6 (fixed in 9.0.6); version 9.1.0 only

Published 2023-03-30. Last modified 2026-06-17.