{"id":"CVE-2023-6004","title":"Libssh: proxycommand/proxyjump features allow injection of malicious code through hostname","summary":"A flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mention…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L","cvssSource":"cna","cwe":["CWE-74"],"vendor":"Red Hat","product":"libssh","affected":["libssh (all versions)","libssh (all versions)","libssh (all versions)","libssh (all versions)","libssh"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2024-01-10T20:45:01.633139Z"},"published":"2024-01-03","updated":"2026-11-06","sourceUpdated":"2026-11-06T13:40:03.637Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-6004","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2504","label":"RHSA-2024:2504"},{"url":"https://access.redhat.com/errata/RHSA-2024:3233","label":"RHSA-2024:3233"},{"url":"https://access.redhat.com/security/cve/CVE-2023-6004"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2251110","label":"RHBZ#2251110"},{"url":"https://www.libssh.org/security/advisories/CVE-2023-6004.txt"}],"tags":["cve.org"],"epss":0.00449,"epssPercentile":0.39261,"ingestedAt":"2026-11-06T13:52:17.105Z","slug":"CVE-2023-6004","body":"## Overview\n\nA flaw was found in libssh. By utilizing the ProxyCommand or ProxyJump feature, users can exploit unchecked hostname syntax on the client. This issue may allow an attacker to inject malicious code into the command of the features mentioned through the hostname parameter.\n\n## Affected\n\n- `libssh (all versions)`\n- `libssh (all versions)`\n- `libssh (all versions)`\n- `libssh (all versions)`\n- `libssh`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}