{"id":"CVE-2023-3255","title":"Qemu: vnc: infinite loop in inflate_buffer() leads to denial of service","summary":"A flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could …","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-835"],"vendor":"Red Hat","product":"virt-devel:rhel","affected":["virt-devel:rhel (all versions)","virt:rhel (all versions)","qemu-kvm (all versions)","qemu-kvm","qemu-kvm","qemu-kvm-ma","virt:av/qemu-kvm"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2025-10-17T17:14:24.314787Z"},"published":"2023-09-13","updated":"2026-11-01","sourceUpdated":"2026-11-01T03:01:56.984Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-3255","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:2135","label":"RHSA-2024:2135"},{"url":"https://access.redhat.com/errata/RHSA-2024:2962","label":"RHSA-2024:2962"},{"url":"https://access.redhat.com/security/cve/CVE-2023-3255"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2218486","label":"RHBZ#2218486"}],"tags":["cve.org"],"epss":0.01891,"epssPercentile":0.7963,"ingestedAt":"2026-11-05T18:28:50.675Z","slug":"CVE-2023-3255","body":"## Overview\n\nA flaw was found in the QEMU built-in VNC server while processing ClientCutText messages. A wrong exit condition may lead to an infinite loop when inflating an attacker controlled zlib buffer in the `inflate_buffer` function. This could allow a remote authenticated client who is able to send a clipboard to the VNC server to trigger a denial of service.\n\n## Affected\n\n- `virt-devel:rhel (all versions)`\n- `virt:rhel (all versions)`\n- `qemu-kvm (all versions)`\n- `qemu-kvm`\n- `qemu-kvm`\n- `qemu-kvm-ma`\n- `virt:av/qemu-kvm`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.4,"exploitation":0,"ransomware":0},"changes":[]}