CVE-2021-3773
CRITICAL
Published Feb 16, 20224y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Published Feb 16, 2022 4y ago
Last Modified Jun 17, 2026 2w ago
Description
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
No active exploitation signals — not in CISA KEV and no EPSS score yet.
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure
Affected Products 9
| Vendor | Product | Version | Range |
|---|---|---|---|
| linux | linux_kernel | * | <5.14 |
| linux | linux_kernel | * | ≥5.15 – <5.15.15 |
| fedoraproject | fedora | 34 | any |
| redhat | enterprise_linux | 6.0 | any |
| redhat | enterprise_linux | 7.0 | any |
| redhat | enterprise_linux | 8.0 | any |
| oracle | communications_cloud_native_core_binding_support_function | 22.1.3 | any |
| oracle | communications_cloud_native_core_network_exposure_function | 22.1.1 | any |
| oracle | communications_cloud_native_core_policy | 22.2.0 | any |
References 4
- bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2004949
- citizenlab.ca https://citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024/
- security.netapp.com https://security.netapp.com/advisory/ntap-20250328-0004/
- oracle.com https://www.oracle.com/security-alerts/cpujul2022.html
Remediation
- oracle.com https://www.oracle.com/security-alerts/cpujul2022.html