{"basis":"claimed","id":"CVE-2026-121599","name":"TOTOLINK A950RG Multi-SSID Configuration cstecgi.cgi delWiFiMultipleConfig stack-based overflow","vendorProject":"TOTOLINK","product":"A950RG","publishedAt":"2026-11-04","cvss":{"score":9.4,"severity":"CRITICAL","version":"4.0"},"exploited":null,"epss":null,"coverage":{"cloudflare":{"status":"none","firstOn":null,"daysToRule":null},"aws":{"status":"none","firstOn":null,"daysToRule":null},"azure":{"status":"none","firstOn":null,"daysToRule":null},"google":{"status":"none","firstOn":null,"daysToRule":null},"fastly":{"status":"none","firstOn":null,"daysToRule":null},"vercel":{"status":"none","firstOn":null,"daysToRule":null},"f5":{"status":"none","firstOn":null,"daysToRule":null},"akamai":{"status":"no_source","firstOn":null,"daysToRule":null},"crs":{"status":"none","firstOn":null,"daysToRule":null}},"title":"TOTOLINK A950RG Multi-SSID Configuration cstecgi.cgi delWiFiMultipleConfig stack-based overflow","description":"A vulnerability was detected in TOTOLINK A950RG 4.1.2cu.5268_B20221104. Affected is the function setWiFiMultipleConfig/delWiFiMultipleConfig of the file /cgi-bin/cstecgi.cgi of the component Multi-SSID Configuration. The manipulation of the argument wepkey2/wepkey3 results in stack-based buffer overflow. It is possible to launch the attack remotely. The exploit is now public and may be used.","cwes":["CWE-121","CWE-119"],"vendors":[{"vendor":"cloudflare","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"aws","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"azure","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"google","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"fastly","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"vercel","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"f5","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"akamai","status":"no_source","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]},{"vendor":"crs","status":"none","basis":"claimed","firstOn":null,"firstIsNew":false,"daysToRule":null,"daysAtMost":null,"freePlan":false,"claims":[]}],"updatedAt":"2026-11-04T01:15:08.896Z","cvssVector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P","ssvc":null,"kevAction":null,"kevNotes":null,"references":[{"url":"https://vuldb.com/vuln/430441","name":"VDB-430441 | TOTOLINK A950RG Multi-SSID Configuration cstecgi.cgi delWiFiMultipleConfig stack-based overflow","tags":["vdb-entry","technical-description"]},{"url":"https://vuldb.com/vuln/430441/cti","name":"VDB-430441 | CTI Indicators (IOB, IOC, IOA)","tags":["signature","permissions-required"]},{"url":"https://vuldb.com/cve/CVE-2026-121599","name":"CVE-2026-121599 | CVE Analysis and Report","tags":["third-party-advisory"]},{"url":"https://vuldb.com/submit/1022561","name":"Submit #1022561 | TOTOLINK A950RG V4.1.2cu.5268_B20221104 Stack Buffer Overflow","tags":["third-party-advisory"]},{"url":"https://gist.github.com/H3rmesk1t/44673654282c9b21bc8971bab7e4b8a3","name":null,"tags":["exploit"]},{"url":"https://www.totolink.net/","name":null,"tags":["product"]}],"affected":[{"vendor":"TOTOLINK","product":"A950RG","affected":["4.1.2cu.5268_B20221104"],"fixed":[]}],"briefing":{"status":{"id":"monitor","label":"Monitor"},"why":"The CVE record rates it critical (CVSS 9.4). No edge WAF vendor names it in a changelog, so default managed rules may or may not catch it. Exploitation in the wild is not established by CISA KEV.","who":"Teams running TOTOLINK A950RG (4.1.2cu.5268_B20221104). Prioritise internet-facing instances.","what_to_do":[{"text":"Apply the vendor's fix; the advisory lists the affected and fixed versions."},{"text":"Do not rely on WAF defaults: no edge vendor names this CVE. Restrict access to the vulnerable component or add a custom rule until it is patched.","href":"#edge","linkText":"Edge coverage"},{"text":"Check which WAF sits in front of your site and whether it covers this CVE.","href":"#check","linkText":"Check your domain"}],"evidence":[{"heading":"CVE record","text":"CVSS 4.0 9.4 (critical). Weakness: CWE-121, CWE-119.","links":[{"label":"CVE-2026-121599","href":"https://www.cve.org/CVERecord?id=CVE-2026-121599"},{"label":"NVD","href":"https://nvd.nist.gov/vuln/detail/CVE-2026-121599"}]},{"heading":"Exploit evidence","text":"No public exploit code found in Exploit-DB, Metasploit, nuclei-templates or GitHub. That does not mean none exists.","links":[]},{"heading":"CISA KEV","text":"Not in the KEV catalog (catalog 2026.11.03, checked 2026-11-04). Absence from KEV is not evidence that it cannot be exploited.","links":[{"label":"CISA KEV catalog","href":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog"}]},{"heading":"WAF vendor statements","text":"No edge vendor changelog names it.","links":[]}],"agent_prompt":"Assess whether the infrastructure available to you is affected by CVE-2026-121599 (TOTOLINK A950RG Multi-SSID Configuration cstecgi.cgi delWiFiMultipleConfig stack-based overflow). Perform a read-only assessment within your authorized access. Do not send exploit traffic, scan third-party systems, change configuration or restart services.\n\n1. Verify the CVE record at https://www.cve.org/CVERecord?id=CVE-2026-121599 and the vendor advisory. Establish affected and fixed versions, including vendor backports. The record lists: TOTOLINK A950RG: affected 4.1.2cu.5268_B20221104. Cite sources and retrieval dates; flag anything you cannot verify.\n2. Inventory deployments of TOTOLINK A950RG: asset, environment, owner where known, installed version or build, and how you confirmed it (package metadata, a version endpoint, image tags). An image tag alone does not prove the running version.\n3. Identify which deployments are reachable from the internet or untrusted networks, and through which paths (direct origin, load balancer, CDN or WAF).\n4. Assess compensating controls separately from patch status. Current edge WAF coverage for this CVE: no edge WAF vendor names it. Live data: https://cve.vigilbase.com/api/v1/cves/CVE-2026-121599. Check whether the rule is enabled and in block mode on each path, and whether any path bypasses the WAF. A WAF rule is not a patch.\n5. Check logs on exposed instances for requests matching the public exploit, if your access allows.\n\nReturn a short summary and a table: asset | version/build | assessment (affected, fixed, not applicable, unknown) | exposure | compensating control | evidence | next action. List what you could not assess and the access needed to resolve it. Do not infer absence of compromise from patch status or a lack of alerts.\n\nRemediation guidance: Apply the vendor's fix; the advisory lists the affected and fixed versions. Do not rely on WAF defaults: no edge vendor names this CVE. Restrict access to the vulnerable component or add a custom rule until it is patched.\nMore: https://cve.vigilbase.com/cve/CVE-2026-121599"},"measured":[],"sightings":null,"social":{"total":2,"first_seen":"2026-11-04T01:13:40.000Z","daily":[{"day":"2026-10-22","posts":0},{"day":"2026-10-23","posts":0},{"day":"2026-10-24","posts":0},{"day":"2026-10-25","posts":0},{"day":"2026-10-26","posts":0},{"day":"2026-10-27","posts":0},{"day":"2026-10-28","posts":0},{"day":"2026-10-29","posts":0},{"day":"2026-10-30","posts":0},{"day":"2026-10-31","posts":0},{"day":"2026-11-01","posts":0},{"day":"2026-11-02","posts":0},{"day":"2026-11-03","posts":0},{"day":"2026-11-04","posts":2}],"top_posts":[{"source":"mastodon","kind":"post","url":"https://infosec.exchange/@offseq/117556644171552757","author":"offseq@infosec.exchange","author_name":"OffSequence","avatar_url":"https://files.mastodon.social/cache/accounts/avatars/114/491/028/075/275/653/original/2325a478da012ae9.png","text":"TOTOLINK A950RG 4.1.2cu.5268_B20221104 hit by CRITICAL stack buffer overflow (CVE-2026-121599, CVSS 9.9). Exploitable via /cgi-bin/cstecgi.cgi — remote code execution possible. No patch yet; isolate devices. Public exploit out. https:// radar.offseq.com/threat/a-vuln erability-w…","engagement":0,"posted_at":"2026-11-04T06:00:36.000Z"},{"source":"bluesky","kind":"post","url":"https://bsky.app/profile/patchthecve.bsky.social/post/3mzh6fiicad2y","author":"patchthecve.bsky.social","author_name":null,"avatar_url":"https://cdn.bsky.app/img/avatar/plain/did:plc:5mmktbw2msy3zitzvymgy3yc/bafkreiekwdtemzouzy5tk5fe744sm77vkihsdj3t44wvqrqmiqrtpb3vum","text":"CVE-2026-121599 CRITICAL (CVSS 9.9)\nA vulnerability was detected in TOTOLINK A950RG 4.1.2cu.5268_B20221104\nFix: https://patchthecve.com/cve/CVE-2026-121599.html","engagement":0,"posted_at":"2026-11-04T01:13:40.000Z"}],"exploit_repositories":[]}}