{"id":"CVE-2020-8515","kind":"vulnerability","aliases":["CVE-2020-8515"],"related":[],"title":"DrayTek Multiple Vigor Routers: Multiple DrayTek Vigor Routers Web Management Page Vulnerability","description":"DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/2960/300B v1.5.1.","summary":"DrayTek Vigor3900, Vigor2960 and Vigor300B routers have an unspecified flaw in their web management page that allows remote code execution. CISA lists it as actively exploited in the wild.","severity":"critical","cvss":10.0,"epss":0.99993,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"DrayTek Multiple Vigor Routers","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["draytek","exploited","infrastructure","self-hosted","vigor2960","vigor300b","vigor3900"],"not_affected_if":["other-draytek-models","web-management-disabled"],"how_to_check":null,"fix":"Apply the vendor update for the affected Vigor model per CISA guidance; the specific firmware version is not stated in the sources.","status":"open","published_at":"2020-02-01T13:15:12+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:43:38+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T21:43:38Z","model":"claude-haiku-5-5","output":{"fix":"Apply the vendor update for the affected Vigor model per CISA guidance; the specific firmware version is not stated in the sources.","reach":"internet","impact":"high","summary":"DrayTek Vigor3900, Vigor2960 and Vigor300B routers have an unspecified flaw in their web management page that allows remote code execution. CISA lists it as actively exploited in the wild.","category":"infrastructure","who_cares":["draytek","vigor3900","vigor2960","vigor300b","self-hosted"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker runs code on the router remotely, potentially taking over the network edge.","analyst_note":"Find the DrayTek advisory and fixed firmware versions for Vigor3900, Vigor2960 and Vigor300B, and confirm whether the web management page must be exposed to WAN for exploitation.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["other-draytek-models","web-management-disabled"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000481,"input_tokens":2850,"output_tokens":391,"severity_before":"unknown"},"analyst_status":"queued","analyst_note":"Find the DrayTek advisory and fixed firmware versions for Vigor3900, Vigor2960 and Vigor300B, and confirm whether the web management page must be exposed to WAN for exploitation.","search":"'-2020':14A,17A '-8515':15A,18A '/mainfunction.cgi':94C '1.3.1':63C '1.3.3':70C '1.4.2.1':72C '1.4.4':66C,75C 'activ':56B 'allow':48B,78C 'authent':85C 'beta':64C,67C,71C,73C,76C 'bin':93C 'cgi':92C 'cgi-bin':91C 'cisa':52B 'code':50B,80C 'cve':13A,16A 'devic':77C 'draytek':1A,6A,19A,23B,32B,61C 'execut':51B,81C 'exploit':24B,57B 'fix':100C 'flaw':41B 'host':28B 'infrastructur':25B 'issu':97C 'list':53B 'manag':10A,45B 'metacharact':88C 'multipl':2A,5A 'multiple':20A 'page':11A,46B 'remot':49B,79C 'root':83C 'router':4A,8A,37B 'routers':22A 'self':27B 'self-host':26B 'shell':87C 'unspecifi':40B 'uri':95C 'v1.5.1':103C 'via':86C 'vigor':3A,7A,21A 'vigor2960':29B,34B,62C 'vigor300b':30B,36B,69C 'vigor3900':31B,33B,65C 'vigor3900/2960/300b':102C 'vulner':12A 'web':9A,44B 'wild':60B 'without':84C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2020-02-01T13:15:12+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_by":"nvd@nist.gov","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2020-8515","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-8515","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T14:39:41+00:00","note":null},{"source":"epss","external_id":"CVE-2020-8515","url":"https://api.first.org/data/v1/epss?cve=CVE-2020-8515","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2020-8515","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8515","severity":null,"published_at":"2020-02-01T13:15:12+00:00","modified_at":"2026-06-17T03:26:30+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}