CVE-2021-4477
Hirschmann HiLCOS OpenBAT BAT450 IPv6 IPsec Firewall Bypass
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
CISA's decision points: whether it is exploited, whether attacks can be automated, and how much control an attacker gets. Assessed (SSVC 2.0.3).What do these mean? →
- Exploitation: none
- Automatable: yes
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: total
- Record last updated
Affected versions
- Belden Hirschmann HiLCOS OpenBAT
3.80-REL, 8.90-REL, 9.00-REL, 9.00-RU1, 9.10-REL, 9.12-REL, 9.12-RU1, 9.12-RU2, 9.12-RU3, 9.12-RU4, 9.12-RU5, 9.12-RU6, 9.12-RU7, 9.12-RU8, 9.12-RU9, 9.13-REL, 9.13-RU1, 10.12-REL, 10.12-RU1