{"id":"CVE-2026-121409","kind":"vulnerability","aliases":["CVE-2026-121409"],"related":[],"title":"FreeRDP: oversized routing token crashes RDP clients and proxies","description":"FreeRDP before 3.32.2 contains a denial of service vulnerability that allows malicious servers or unauthenticated peers to abort clients or proxies via oversized X.224 routing tokens. Attackers can send an oversized LoadBalanceInfo in a Server Redirection PDU, or a 240–247 byte token to a FixedTarget freerdp-proxy, triggering a tpdu_write_header assertion that crashes the process.","summary":"FreeRDP before 3.32.2 crashes when a malicious server or unauthenticated peer sends an oversized X.224 routing token in a Server Redirection PDU or to a FixedTarget freerdp-proxy. The crash stops the client or proxy process, which is a denial of service with no code execution stated in the sources.","severity":"high","cvss":8.2,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["freerdp","linux","proxy","rdp","runtime","windows"],"not_affected_if":["freerdp-3.32.2-or-later","trusted-servers-only"],"how_to_check":"- Check the installed FreeRDP version, for example with `xfreerdp --version`, and compare it to `3.32.2`.\n- If you run freerdp-proxy with a FixedTarget configuration, note that this path is named in the advisory.","fix":"- Move FreeRDP to `3.32.2` or later.","status":"open","published_at":"2026-11-03T15:17:29+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","triaged_at":"2026-11-03T15:22:46+00:00","updated_at":"2026-11-03T15:22:46+00:00","category":"runtime","confidence":0.6,"triage":{"at":"2026-11-03T15:22:46Z","model":"claude-haiku-5-5","output":{"fix":"- Move FreeRDP to `3.32.2` or later.","reach":"network","title":"FreeRDP: oversized routing token crashes RDP clients and proxies","impact":"low","summary":"FreeRDP before 3.32.2 crashes when a malicious server or unauthenticated peer sends an oversized X.224 routing token in a Server Redirection PDU or to a FixedTarget freerdp-proxy. The crash stops the client or proxy process, which is a denial of service with no code execution stated in the sources.","audience":"developers","category":"runtime","nicknames":[],"who_cares":["freerdp","rdp","linux","windows","proxy"],"confidence":0.6,"fix_status":"available","needs_auth":"no","worst_case":"Client or proxy process crashes, causing denial of service","analyst_note":"","how_to_check":"- Check the installed FreeRDP version, for example with `xfreerdp --version`, and compare it to `3.32.2`.\n- If you run freerdp-proxy with a FixedTarget configuration, note that this path is named in the advisory.","plain_action":"","needs_analyst":false,"not_affected_if":["trusted-servers-only","freerdp-3.32.2-or-later"],"who_is_affected":"Teams that run FreeRDP clients, or freerdp-proxy in FixedTarget mode, and accept connections from servers or peers they do not fully trust. The sources describe a crash (denial of service), not code execution. Teams that only use FreeRDP against trusted servers on closed networks are less exposed.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"high"},"cost_usd":0.000706,"input_tokens":4215,"output_tokens":569,"severity_before":"high"},"analyst_status":null,"analyst_note":null,"search":"'-121409':12A,15A '-2026':11A,14A '240':112C '247':113C '3.32.2':24B,75C 'abort':90C 'allow':83C 'assert':127C 'attack':99C 'byte':114C 'client':7A,55B,91C 'code':67B 'contain':76C 'crash':5A,25B,52B,129C 'cve':10A,13A 'denial':62B,78C 'execut':68B 'fixedtarget':47B,118C 'freerdp':1A,16B,22B,49B,73C,120C 'freerdp-proxi':48B,119C 'header':126C 'linux':17B 'loadbalanceinfo':104C 'malici':28B,84C 'overs':2A,35B,95C,103C 'pdu':43B,109C 'peer':32B,88C 'process':58B,131C 'proxi':9A,18B,50B,57B,93C,121C 'rdp':6A,19B 'redirect':42B,108C 'rout':3A,37B,97C 'runtim':20B 'send':33B,101C 'server':29B,41B,85C,107C 'servic':64B,80C 'sourc':72B 'state':69B 'stop':53B 'token':4A,38B,98C,115C 'tpdu':124C 'trigger':122C 'unauthent':31B,87C 'via':94C 'vulner':81C 'window':21B 'write':125C 'x.224':36B,96C","nicknames":[],"mitigations":[],"who_affected":"Teams that run FreeRDP clients, or freerdp-proxy in FixedTarget mode, and accept connections from servers or peers they do not fully trust. The sources describe a crash (denial of service), not code execution. Teams that only use FreeRDP against trusted servers on closed networks are less exposed.","tier":"B","verified":{},"analyst_revisit_at":null,"fix_status":"available","audience":"developers","plain_action":null,"pkeys":[],"ptokens":[],"labels":["freerdp","high","linux","proxy","rdp","runtime","windows"],"first_public_at":"2026-10-19T12:31:14+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/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-2026-121409","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121409","severity":null,"published_at":"2026-11-03T15:17:29+00:00","modified_at":"2026-11-03T15:17:29+00:00","first_seen_at":"2026-11-03T15:21:58+00:00","fetched_at":"2026-11-03T15:21:58+00:00","note":null}],"documents":[{"id":58341,"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3hf9-w6hr-hf9j","title":"Vendor advisory: github.com","kind":"vendor","source":"nvd","publisher":"vendor","text":null,"published_at":"2026-10-19T12:31:14+00:00","relation":"advisory","confidence":null,"note":"Vendor advisory: github.com"},{"id":58342,"url":"https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-oversized-x-224-routing-token","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"}