CVE-2026-120865

{
  "etk_id": "ETK-2026-4366",
  "cve_id": "CVE-2026-120865",
  "display_id": "CVE-2026-120865",
  "ghsa_id": "GHSA-h4x9-24c3-pjfm",
  "euvd_id": "EUVD-2026-124913",
  "status": "published",
  "anchor_state": "anchored",
  "title": "HTTP/3 QUIC memory overflow in NetScaler ADC and Gateway",
  "summary": "Citrix NetScaler ADC and NetScaler Gateway HTTP/3 (QUIC) handling is affected by a memory overflow. An attacker able to send QUIC traffic to the affected service may cause denial of service or unpredictable behavior; exposure depends on HTTP/3/QUIC being reachable.",
  "mitigation": "Upgrade NetScaler ADC to 14.1-73.57, 13.1-64.39, 14.1-73.58 FIPS, or 13.1-37.293 FIPS and NDcPP, as applicable. Upgrade NetScaler Gateway to 14.1-73.57 or 13.1-64.39; restrict access to HTTP/3/QUIC services until upgrades are complete.",
  "vendor": "Citrix",
  "product": "NetScaler ADC",
  "affected": [
    {
      "affected_notes": [
        ">= 0, < 14.1-73.58 FIPS",
        ">= 0, < 13.1-37.293 FIPs and NDcPP"
      ],
      "affected_ranges": [
        ">= 0, < 14.1-73.57",
        ">= 0, < 13.1-64.39"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "14.1-73.57",
        "13.1-64.39",
        "14.1-73.58 FIPS",
        "13.1-37.293 FIPs and NDcPP"
      ],
      "package_name": "NetScaler ADC",
      "purl": null
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0, < 14.1-73.57",
        ">= 0, < 13.1-64.39"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "14.1-73.57",
        "13.1-64.39"
      ],
      "package_name": "NetScaler Gateway",
      "purl": null
    }
  ],
  "cwes": null,
  "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:L/SI:L/SA:L",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 9.637824783333333,
  "t0_at": "2026-11-13T08:11:19.158000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-13T08:11:19.158000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T08:11:19.158000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-120865"
    }
  }
}