CVE-2026-121617

{
  "etk_id": "ETK-2026-3442",
  "cve_id": "CVE-2026-121617",
  "display_id": "CVE-2026-121617",
  "ghsa_id": "GHSA-ch52-qqqr-2wgh",
  "euvd_id": "EUVD-2026-116695",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Out-of-bounds write in Linksys E5600 firmware upload parser",
  "summary": "Linksys E5600 firmware version 1.1.0.26 has an out-of-bounds write in header processing for its firmware-upload CGI endpoint. A remote attacker who can reach that interface may be able to corrupt memory; the available record does not specify whether authentication is required.",
  "mitigation": "Restrict access to the router administration and firmware-upload interfaces to trusted management networks only, and block them from the internet. Replace affected E5600 devices with supported hardware, as no fixed version is recorded.",
  "vendor": "Linksys",
  "product": "E5600",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "1.1.0.26"
      ],
      "ecosystem": null,
      "fixed_versions": [],
      "package_name": "E5600",
      "purl": null
    }
  ],
  "cwes": [
    787
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 31.173996816666666,
  "t0_at": "2026-11-04T02:45:20.465000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-10T14:39:56+00:00",
      "days": -24.503755381944444,
      "is_lower_bound": false,
      "measured_at": "2026-11-04T02:45:20.465000+00:00",
      "url": "https://github.com/Zimo-666/E5600-cves"
    },
    "trigger_signal": {
      "at": "2026-11-04T02:45:20.465000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-04T02:45:20.465000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-121617"
    }
  }
}