{"id":"CVE-2025-20362","kind":"vulnerability","aliases":["CVE-2025-20362"],"related":[],"title":"Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA…","description":"Update: On November 5, 2025, Cisco became aware of a new attack variant against devices running Cisco Secure ASA Software or Cisco Secure FTD Software releases that are affected by CVE-2025-20333 and CVE-2025-20362. This attack can cause unpatched devices to unexpectedly reload, leading to denial of service (DoS) conditions. Cisco strongly recommends that all customers upgrade to the fixed software releases that are listed in the Fixed Software [\"#fs\"] section of this advisory.\r\n\r A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to access restricted URL endpoints that are related to remote access VPN that should otherwise be inaccessible without authentication.\r\n\r This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker could exploit this vulnerability by sending crafted HTTP requests to a targeted web server on a device. A successful exploit could allow the attacker to access a restricted URL without authentication.","summary":"A missing authorization check in the VPN web server of Cisco ASA and Firewall Threat Defense (FTD) software lets a remote party reach functions they should not. Per the sources it can be chained with CVE-2025-20333, and it is listed as actively exploited in the wild.","severity":"critical","cvss":8.6,"epss":null,"exploited":true,"exploited_at":"2025-09-25T00:00:00+00:00","products":[{"name":"Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.12.4.72"],"affected":">= 9.12, < 9.12.4.72","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.14.4.28"],"affected":">= 9.14, < 9.14.4.28","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.16.4.85"],"affected":">= 9.16, < 9.16.4.85","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.18.4.67"],"affected":">= 9.17.0, < 9.18.4.67","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.20.4.10"],"affected":">= 9.19, < 9.20.4.10","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.22.2.14"],"affected":">= 9.22, < 9.22.2.14","ecosystem":"vendor"},{"name":"cisco adaptive security appliance software","fixed":["9.23.1.19"],"affected":">= 9.23, < 9.23.1.19","ecosystem":"vendor"},{"name":"cisco secure firewall threat defense","fixed":["7.0.8.1"],"affected":">= 7.0.0, < 7.0.8.1","ecosystem":"vendor"},{"name":"cisco secure firewall threat defense","fixed":["7.2.10.2"],"affected":">= 7.1.0, < 7.2.10.2","ecosystem":"vendor"},{"name":"cisco secure firewall threat defense","fixed":["7.4.2.4"],"affected":">= 7.3.0, < 7.4.2.4","ecosystem":"vendor"},{"name":"cisco secure firewall threat defense","fixed":["7.6.2.1"],"affected":">= 7.6.0, < 7.6.2.1","ecosystem":"vendor"},{"name":"cisco secure firewall threat defense","fixed":["7.7.10.1"],"affected":">= 7.7.0, < 7.7.10.1","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["asa","cisco","exploited","firewall","ftd","infrastructure","vpn"],"not_affected_if":["no-vpn-web-server-enabled"],"how_to_check":null,"fix":"Follow the vendor and CISA mitigation guidance referenced in the KEV entry (ED 25-03); the sources do not name a fixed version.","status":"open","published_at":"2025-09-25T00:00:00+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:44:49+00:00","updated_at":"2026-10-23T23:44:51+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-23T20:44:49Z","model":"claude-haiku-5-5","output":{"fix":"Follow the vendor and CISA mitigation guidance referenced in the KEV entry (ED 25-03); the sources do not name a fixed version.\nunknown","reach":"internet","summary":"A missing authorization check in the VPN web server of Cisco ASA and Firewall Threat Defense (FTD) software lets a remote party reach functions they should not. Per the sources it can be chained with CVE-2025-20333, and it is listed as actively exploited in the wild.","category":"infrastructure","who_cares":["cisco","asa","ftd","firewall","vpn"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker bypasses VPN web server access controls on the firewall, possibly chained with CVE-2025-20333 for code execution.","analyst_note":"Find the Cisco advisory and fixed versions for CVE-2025-20362 and the ED 25-03 mitigation steps, plus the exact check for whether the VPN web server is enabled.","how_to_check":"unknown","needs_analyst":true,"not_affected_if":["no-vpn-web-server-enabled"],"user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000487,"input_tokens":2765,"output_tokens":421,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2025':21A,24A,140B,183C,187C '-20333':141B,184C '-20362':22A,25A,188C '2025':5A,156C '5':4A,155C 'access':260C,269C,321C 'activ':147B 'adapt':240C 'adaptive':29A,38A,43A,48A,53A,58A,63A,68A 'advisori':228C 'affect':180C 'allow':254C,317C 'and':32A 'applianc':242C 'appliance':31A,40A,45A,50A,55A,60A,65A,70A 'asa':19A,97B,115B,170C,243C 'attack':12A,163C,190C,258C,295C,319C 'authent':277C,326C 'author':106B 'awar':8A,159C 'becam':7A,158C 'caus':192C 'chain':137B 'check':107B 'cisco':6A,17A,26A,37A,42A,47A,52A,57A,62A,67A,72A,77A,82A,87A,92A,98B,114B,157C,168C,173C,205C,237C,246C 'condit':204C 'could':253C,296C,316C 'craft':302C 'custom':210C 'cve':20A,23A,139B,182C,186C 'defens':119B,250C 'defense':36A,76A,81A,86A,91A,96A 'denial':200C 'devic':15A,166C,194C,312C 'dos':203C 'due':281C 'endpoint':263C 'exploit':99B,148B,297C,315C 'firewal':100B,117B,239C,248C 'firewall':28A,34A,74A,79A,84A,89A,94A 'fix':214C,222C 'fs':224C 'ftd':101B,120B,175C,251C 'function':127B 'http':291C,303C 'improp':283C 'inaccess':275C 'infrastructur':102B 'input':289C 'lead':198C 'let':122B 'list':145B,219C 'miss':105B 'new':11A,162C 'novemb':3A,154C 'otherwis':273C 'parti':125B 'per':131B 'reach':126B 'recommend':207C 'relat':266C 'releas':177C,216C 'reload':197C 'remot':124B,257C,268C 'request':293C,304C 'restrict':261C,323C 'run':16A,167C 'section':225C 'secur':18A,169C,174C,238C,241C,247C 'secure':27A,33A,73A,78A,83A,88A,93A 'security':30A,39A,44A,49A,54A,59A,64A,69A 'send':301C 'server':112B,235C,309C 'servic':202C 'softwar':121B,171C,176C,215C,223C,244C,252C 'software':41A,46A,51A,56A,61A,66A,71A 'sourc':133B 'strong':206C 'success':314C 'suppli':288C 'target':307C 'threat':35A,75A,80A,85A,90A,95A,118B,249C 'unauthent':256C 'unexpect':196C 'unpatch':193C 'updat':1A,152C 'upgrad':211C 'url':262C,324C 'user':287C 'user-suppli':286C 'valid':284C 'variant':13A,164C 'vpn':103B,110B,233C,270C 'vulner':230C,279C,299C 'web':111B,234C,308C 'wild':151B 'without':276C,325C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2025-09-25T00:00:00+00:00","kev":{"dateAdded":"2025-09-25","dueDate":"2025-09-26","requiredAction":"The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cvss_by":"psirt@cisco.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2025-20362","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-20362","severity":null,"published_at":"2025-09-25T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T10:39:04+00:00","note":null},{"source":"nvd","external_id":"CVE-2025-20362","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-20362","severity":null,"published_at":"2025-09-25T16:15:32+00:00","modified_at":"2026-10-18T21:10:00+00:00","first_seen_at":"2026-10-23T23:44:51+00:00","fetched_at":"2026-10-23T23:44:51+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"}