{"id":"CVE-2025-6599","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-6599","generatedAt":"2026-10-28T00:18:17.795Z","title":"An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks.","description":"An uncontrolled resource consumption vulnerability in the web server of Zyxel DX3301-T0 firmware version 5.50(ABVY.6.3)C0 and earlier could allow an attacker to perform Slowloris‑style denial‑of‑service (DoS) attacks. Such attacks may temporarily block legitimate HTTP requests and partially disrupt access to the web management interface, while other networking services remain unaffected.","published":"2025-11-18T02:15:45.000Z","lastModified":"2026-10-18T20:10:00.000Z","status":"Analyzed","sourceIdentifier":"security@zyxel.com.tw","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["zyxel/lte3301-plus firmware","zyxel/nr5103 firmware","zyxel/nr5103e firmware","zyxel/nr5309 firmware","zyxel/nr7302 firmware","zyxel/nr7303 firmware","zyxel/nebula fwa505 firmware","zyxel/nebula fwa510 firmware","zyxel/nebula fwa515 firmware","zyxel/nebula fwa710 firmware","zyxel/dm4200-b0 firmware","zyxel/dx3300-t0 firmware","zyxel/dx3300-t1 firmware","zyxel/dx3301-t0 firmware","zyxel/dx4510-b1 firmware","zyxel/dx5401-b0 firmware","zyxel/dx5401-b1 firmware","zyxel/ee3301-00 firmware","zyxel/ee5301-00 firmware","zyxel/ee6510-10 firmware","zyxel/ex3300-t0 firmware","zyxel/ex3300-t1 firmware","zyxel/ex3301-t0 firmware","zyxel/ex3500-t0 firmware","zyxel/ex3501-t0 firmware","zyxel/ex3600-t0 firmware","zyxel/ex5401-b0 firmware","zyxel/ex5401-b1 firmware","zyxel/ex5501-b0 firmware","zyxel/ex5510-b0 firmware","zyxel/ex5512-t0 firmware","zyxel/ex5601-t0 firmware","zyxel/ex5601-t1 firmware","zyxel/ex7501-b0 firmware","zyxel/ex7710-b0 firmware","zyxel/emg3525-t50b firmware","zyxel/emg5523-t50b firmware","zyxel/emg5723-t50k firmware","zyxel/emg6726-b10a firmware","zyxel/gm4100-b0 firmware","zyxel/vmg3625-t50b firmware","zyxel/vmg3927-b50b firmware","zyxel/vmg3927-t50k firmware","zyxel/vmg4005-b50a firmware","zyxel/vmg4005-b60a firmware","zyxel/vmg4005-b50b firmware","zyxel/vmg4927-b50a firmware","zyxel/vmg8623-t50b firmware","zyxel/vmg8825-t50k firmware","zyxel/ax7501-b0 firmware","zyxel/ax7501-b1 firmware","zyxel/pe3301-00 firmware","zyxel/pe5301-01 firmware","zyxel/pm3100-t0 firmware","zyxel/pm5100-t0 firmware","zyxel/pm7500-00 firmware","zyxel/pm7300-t0 firmware","zyxel/px3321-t1 firmware","zyxel/px5301-t0 firmware","zyxel/scr 50axe firmware"],"epss":{"score":0.00335,"percentile":0.26624,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.34%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-uncontrolled-resource-consumption-and-command-injection-vulnerabilities-in-certain-4g-lte-5g-nr-cpe-dsl-ethernet-cpe-fiber-onts-security-routers-and-wireless-extenders-11-18-2025","tags":["Vendor Advisory"],"source":"security@zyxel.com.tw"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-6599","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}