Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1000 CNY

100.0%
Buy Us a Coffee

CVE-2021-4477— Hirschmann HiLCOS OpenBAT BAT450 IPv6 IPsec Firewall Bypass

CVSS 9.1 · Critical EPSS 0.00% · P0
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2021-4477

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Hirschmann HiLCOS OpenBAT BAT450 IPv6 IPsec Firewall Bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Hirschmann HiLCOS OpenBAT and BAT450 products contain a firewall bypass vulnerability in IPv6 IPsec deployments that allows traffic from VPN connections to bypass configured firewall rules. Attackers can exploit this vulnerability by establishing IPv6 IPsec connections (IKEv1 or IKEv2) while simultaneously using an IPv6 Internet connection to circumvent firewall policy enforcement.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
访问控制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Belden Hirschmann HiLCOS OpenBAT 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Belden Hirschmann HiLCOS OpenBAT是美国Belden公司的一款工业级无线局域网设备。 Belden Hirschmann HiLCOS OpenBAT存在访问控制错误漏洞，该漏洞源于IPv6 IPsec部署中的防火墙绕过问题，可能导致VPN连接流量绕过配置的防火墙规则。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Shenlong Deep Dive — AI Deep Analysis

10-question deep dive: root cause, exploitation, mitigation, urgency. Read summary free, full version requires login.

Read summary Full analysis (login)

Affected Products

VendorProductAffected VersionsCPESubscribe
BeldenHirschmann HiLCOS OpenBAT 3.80-REL -

II. Public POCs for CVE-2021-4477

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-4477

请登录查看更多情报信息。

Same Patch Batch · Belden · 2026-04-03 · 11 CVEs total

CVE-2017-202379.8 CRITICALHirschmann Industrial HiVision Authentication Bypass Remote Code Execution
CVE-2018-252379.8 CRITICALHirschmann HiSecOS Buffer Overflow via HTTPS Login
CVE-2018-252369.8 CRITICALHirschmann HiOS HiSecOS Authentication Bypass via HTTP Management
CVE-2017-202349.8 CRITICALGarrettCom Magnum 6K and 10K Authentication Bypass via Hardcoded String
CVE-2016-150588.1 HIGHHirschmann HiLCOS Classic Platform Password Exposure via SNMP
CVE-2020-372167.5 HIGHHirschmann HiOS EtherNet/IP Stack Denial of Service
CVE-2015-101487.5 HIGHHirschmann HiLCOS Hard-coded Credentials SSH SSL Keys
CVE-2022-49877.3 HIGHHirschmann Industrial HiVision External Application Path Hijacking Leading to Arbitrary Co
CVE-2017-202387.1 HIGHHirschmann Industrial HiVision Improper Authorization Privilege Escalation
CVE-2017-202335.4 MEDIUMHirschmann HiLCOS Layer-2 Firewall Multicast Broadcast Traffic Bypass

IV. Related Vulnerabilities

Same vendor: Belden
Same weakness: CWE-284

V. Comments for CVE-2021-4477

No comments yet

Leave a comment