{"id":"CVE-2026-118579","kind":"vulnerability","aliases":["CVE-2026-118579"],"related":[],"title":"D-Link DIR-505 router: web CGI flaw lets remote attackers plant a backdoor","description":"A weakness has been identified in D-Link DIR-505 1.10B02. The impacted element is the function main of the file /secmark1524.cgi of the component Web Management CGI. This manipulation of the argument accu/pass/code/hash/cmds causes backdoor. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.","summary":"A weakness in the main function of the /secmark1524.cgi web management script on the D-Link DIR-505 (firmware 1.10B02) lets an attacker manipulate the accu/pass/code/hash/cmds argument and create a backdoor. An attacker who can reach the router's web interface over the network can gain control of the device, and a public exploit is available.","severity":"critical","cvss":10.0,"epss":null,"exploited":false,"exploited_at":null,"products":[],"ecosystems":[],"tags":["d-link","dir-505","infrastructure","routers","self-hosted"],"not_affected_if":["admin-interface-not-exposed","other-models"],"how_to_check":"- Check the firmware version on the router's admin page or in its status screen; the sources name version `1.10B02` as affected.\n- Check whether the web management interface is reachable from the internet, e.g. from outside your network.\n- Check the router for an unknown `/secmark1524.cgi` request in web server or access logs, if logs are kept.","fix":"- unknown: the sources do not name a fixed firmware version or a vendor advisory.\n- Until a fix is confirmed, disable remote web administration and restrict the admin interface to trusted internal addresses.\n- Replace the device if the vendor does not publish a fix.","status":"open","published_at":"2026-10-28T23:17:09+00:00","first_seen_at":"2026-10-28T23:35:49+00:00","triaged_at":"2026-10-28T23:36:40+00:00","updated_at":"2026-10-28T23:36:40+00:00","category":"infrastructure","confidence":0.6,"triage":{"at":"2026-10-28T23:36:40Z","model":"claude-haiku-5-5","output":{"fix":"- unknown: the sources do not name a fixed firmware version or a vendor advisory.\n- Until a fix is confirmed, disable remote web administration and restrict the admin interface to trusted internal addresses.\n- Replace the device if the vendor does not publish a fix.","reach":"internet","title":"D-Link DIR-505 router: web CGI flaw lets remote attackers plant a backdoor","impact":"high","summary":"A weakness in the main function of the /secmark1524.cgi web management script on the D-Link DIR-505 (firmware 1.10B02) lets an attacker manipulate the accu/pass/code/hash/cmds argument and create a backdoor. An attacker who can reach the router's web interface over the network can gain control of the device, and a public exploit is available.","category":"infrastructure","nicknames":[],"who_cares":["d-link","dir-505","routers","self-hosted"],"confidence":0.6,"needs_auth":"unknown","worst_case":"Attacker gains a backdoor and full control of the router","analyst_note":"Confirm the vendor fix version and whether the admin interface needs authentication, using the NVD entry at https://nvd.nist.gov/vuln/detail/CVE-2026-118579 and D-Link's security bulletins.","how_to_check":"- Check the firmware version on the router's admin page or in its status screen; the sources name version `1.10B02` as affected.\n- Check whether the web management interface is reachable from the internet, e.g. from outside your network.\n- Check the router for an unknown `/secmark1524.cgi` request in web server or access logs, if logs are kept.","needs_analyst":true,"not_affected_if":["other-models","admin-interface-not-exposed"],"who_is_affected":"Any network that runs a D-Link DIR-505 on firmware 1.10B02 with the web management interface reachable is exposed. Devices behind a firewall that blocks the admin interface from untrusted networks carry less risk. Teams that do not run this model can skip it.","user_interaction":"no","needs_special_setup":"unknown","severity_if_unknown":"critical"},"cost_usd":0.000693,"input_tokens":3327,"output_tokens":721,"severity_before":"critical"},"analyst_status":null,"analyst_note":null,"search":"'-118579':18A,21A '-2026':17A,20A '-505':5A,26B,50B,100C '/secmark1524.cgi':40B,113C '1.10':52B,101C 'accu/pass/code/hash/cmds':59B,125C 'argument':60B,124C 'attack':12A,56B,66B,129C,151C 'avail':89B,142C 'b02':53B,102C 'backdoor':15A,64B,127C 'carri':134C 'caus':126C 'cgi':8A,119C 'compon':116C 'control':80B 'could':147C 'creat':62B 'cve':16A,19A 'd':2A,23B,47B,97C 'd-link':1A,22B,46B,96C 'devic':83B 'dir':4A,25B,49B,99C 'element':105C 'exploit':87B,138C 'file':112C 'firmwar':51B 'flaw':9A 'function':37B,108C 'gain':79B 'host':31B 'identifi':94C 'impact':104C 'infrastructur':27B 'interfac':74B 'let':10A,54B 'link':3A,24B,48B,98C 'made':141C 'main':36B,109C 'manag':42B,118C 'manipul':57B,121C 'network':77B 'plant':13A 'possibl':131C 'public':86B,145C 'reach':69B 'remot':11A,136C 'router':6A,28B,71B 'script':43B 'self':30B 'self-host':29B 'use':149C 'weak':33B,91C 'web':7A,41B,73B,117C","nicknames":[],"mitigations":[],"who_affected":"Any network that runs a D-Link DIR-505 on firmware 1.10B02 with the web management interface reachable is exposed. Devices behind a firewall that blocks the admin interface from untrusted networks carry less risk. Teams that do not run this model can skip it.","tier":"B","verified":{},"analyst_revisit_at":null,"first_public_at":"2026-10-28T23:17:09+00:00","kev":null,"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/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":"cna@vuldb.com","poc_count":0,"sources":[{"source":"nvd","external_id":"CVE-2026-118579","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118579","severity":null,"published_at":"2026-10-28T23:17:09+00:00","modified_at":"2026-10-28T23:17:09+00:00","first_seen_at":"2026-10-28T23:35:49+00:00","fetched_at":"2026-10-28T23:35:49+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"}