{"id":"CVE-2026-121389","kind":"vulnerability","aliases":["CVE-2026-121389"],"related":[],"title":"FreeRDP: malformed device-list packet from a server aborts the client","description":"FreeRDP from 3.27.0 before 3.32.2 contains a denial of service vulnerability in rdpdr_dump_packet that allows malicious RDP servers to abort clients by sending malformed RDPDR device-list announcements. Attackers can declare a DeviceDataLength exceeding the received packet, triggering a fatal Stream_Seek assertion when device redirection, TRACE logging, and WinPR assertions are enabled.","summary":"FreeRDP, a remote desktop client library, crashes when a malicious RDP server sends a malformed device-list announcement with a declared length larger than the packet. An attacker gets a denial of service that aborts the client, with no code execution stated in the sources.","severity":"low","cvss":3.1,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","package","rdp-clients","remote-desktop"],"not_affected_if":["default-config","trusted-servers-only","versions-before-3.27.0"],"how_to_check":"- Check the FreeRDP version in use: `xfreerdp --version` or the package manager's version for `freerdp`\n- Confirm whether device redirection (RDPDR) is enabled in the client configuration\n- Confirm whether the build has WinPR assertions and TRACE logging enabled, which the sources say are required","fix":"- Move to FreeRDP `3.32.2` or later, the first fixed version stated by the sources","status":"open","published_at":"2026-11-03T15:17:26+00:00","first_seen_at":"2026-11-03T15:21:57+00:00","triaged_at":"2026-11-03T15:24:51+00:00","updated_at":"2026-11-03T15:24:51+00:00","category":"package","confidence":0.7,"triage":{"at":"2026-11-03T15:24:51Z","model":"claude-haiku-5-5","output":{"fix":"- Move to FreeRDP `3.32.2` or later, the first fixed version stated by the sources","reach":"network","title":"FreeRDP: malformed device-list packet from a server aborts the client","impact":"low","summary":"FreeRDP, a remote desktop client library, crashes when a malicious RDP server sends a malformed device-list announcement with a declared length larger than the packet. An attacker gets a denial of service that aborts the client, with no code execution stated in the sources.","audience":"developers","category":"package","nicknames":[],"who_cares":["freerdp","remote-desktop","rdp-clients"],"confidence":0.7,"fix_status":"available","needs_auth":"no","worst_case":"Client application aborts when connecting to a malicious server","analyst_note":"","how_to_check":"- Check the FreeRDP version in use: `xfreerdp --version` or the package manager's version for `freerdp`\n- Confirm whether device redirection (RDPDR) is enabled in the client configuration\n- Confirm whether the build has WinPR assertions and TRACE logging enabled, which the sources say are required","plain_action":"","needs_analyst":false,"not_affected_if":["default-config","trusted-servers-only","versions-before-3.27.0"],"who_is_affected":"Only clients connecting to RDP servers the team does not trust can be aborted, since the malicious packet must come from a server. The sources say the crash needs device redirection enabled and a debug-style build with TRACE logging and WinPR assertions on, so default builds are less exposed. Teams that only connect to their own trusted RDP hosts can deprioritise it.","user_interaction":"yes","needs_special_setup":"yes","severity_if_unknown":"low"},"cost_usd":0.000719,"input_tokens":4224,"output_tokens":593,"severity_before":"low"},"analyst_status":null,"analyst_note":null,"search":"'-121389':15A,18A '-2026':14A,17A '3.27.0':75C '3.32.2':77C 'abort':10A,62B,94C 'allow':89C 'announc':45B,103C 'assert':118C,126C 'attack':55B,104C 'client':12A,23B,31B,64B,95C 'code':67B 'contain':78C 'crash':33B 'cve':13A,16A 'declar':48B,106C 'denial':58B,80C 'desktop':26B,30B 'devic':4A,43B,101C,120C 'device-list':3A,42B,100C 'devicedatalength':108C 'dump':86C 'enabl':128C 'exceed':109C 'execut':68B 'fatal':115C 'freerdp':1A,19B,27B,73C 'get':56B 'larger':50B 'length':49B 'librari':32B 'list':5A,44B,102C 'log':123C 'malform':2A,41B,98C 'malici':36B,90C 'packag':20B 'packet':6A,53B,87C,112C 'rdp':22B,37B,91C 'rdp-client':21B 'rdpdr':85C,99C 'receiv':111C 'redirect':121C 'remot':25B,29B 'remote-desktop':24B 'seek':117C 'send':39B,97C 'server':9A,38B,92C 'servic':60B,82C 'sourc':72B 'state':69B 'stream':116C 'trace':122C 'trigger':113C 'vulner':83C 'winpr':125C","nicknames":[],"mitigations":[],"who_affected":"Only clients connecting to RDP servers the team does not trust can be aborted, since the malicious packet must come from a server. The sources say the crash needs device redirection enabled and a debug-style build with TRACE logging and WinPR assertions on, so default builds are less exposed. Teams that only connect to their own trusted RDP hosts can deprioritise it.","tier":"C","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freerdp","low","package","rdpclients","remotedesktop"],"first_public_at":"2026-10-19T07:28:28+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","cvss_by":"disclosure@vulncheck.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-121389","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121389","severity":null,"published_at":"2026-11-03T15:17:26+00:00","modified_at":"2026-11-03T15:17:26+00:00","first_seen_at":"2026-11-03T15:21:57+00:00","fetched_at":"2026-11-03T15:21:57+00:00","note":null}],"documents":[{"id":58301,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-66mr-7wc7-23vc","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T07:28:28+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58302,"url":"https://www.vulncheck.com/advisories/freerdp-3.27.0-before-3.32.2-client-dos-via-rdpdr-device-announcement-logging","title":"Third-party advisory: www.vulncheck.com","kind":"advisory","source":"nvd","publisher":"research","text":null,"published_at":null,"relation":"advisory","confidence":null,"note":"Third-party advisory: www.vulncheck.com"}],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}