{"id":"CVE-2025-49177","title":"A flaw was found in the XFIXES extension","summary":"A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L","cwe":["CWE-200"],"published":"2025-06-17","updated":"2026-06-25","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-49177","references":[{"url":"https://access.redhat.com/errata/RHSA-2025:10258","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:9303","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2025:9304","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2025-49177","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2369955","label":"secalert@redhat.com"},{"url":"https://gitlab.freedesktop.org/xorg/xserver/-/commit/ab02fb96b1c701c3bb47617d965522c34befa6af","label":"secalert@redhat.com"},{"url":"https://www.x.org/wiki/Development/Security/","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00429,"epssPercentile":0.36788,"ingestedAt":"2026-06-29T13:24:34.376Z","slug":"CVE-2025-49177","body":"## Overview\n\nA flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}