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CVE-2021-4477

🗓️ 03 Apr 2026 22:37:45Reported by VulnCheckType 
cve
 cve
🔗 web.nvd.nist.gov👁 6 Views

Vulnerability in Hirschmann HiLCOS OpenBAT and BAT450 lets IPv6 VPN traffic bypass firewall rules via IPsec.

Related
Detection
Affected
Refs
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2021-4477
3 Apr 202622:37
attackerkb
CNNVD
Belden Hirschmann HiLCOS OpenBAT 访问控制错误漏洞
3 Apr 202600:00
cnnvd
Cvelist
CVE-2021-4477 Hirschmann HiLCOS OpenBAT BAT450 IPv6 IPsec Firewall Bypass
3 Apr 202622:37
cvelist
EUVD
EUVD-2021-34774
4 Apr 202600:31
euvd
NVD
CVE-2021-4477
3 Apr 202623:17
nvd
Positive Technologies
PT-2026-30263
3 Apr 202600:00
ptsecurity
Vulnrichment
CVE-2021-4477 Hirschmann HiLCOS OpenBAT BAT450 IPv6 IPsec Firewall Bypass
3 Apr 202622:37
vulnrichment
[
  {
    "vendor": "Belden",
    "product": "Hirschmann HiLCOS OpenBAT",
    "versions": [
      {
        "status": "affected",
        "version": "3.80-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "8.90-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.00-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.00-RU1",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.10-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU1",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU2",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU3",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU4",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU5",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU6",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU7",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU8",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.12-RU9",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.13-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "9.13-RU1",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "10.12-REL",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "10.12-RU1",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "10.12-RU2",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unaffected"
  }
]

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17 Jun 2026 04:19Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.19.1
CVSS 49.3
EPSS0.00319
SSVC
6