CVE-2021-3773
9.8
CRITICAL · CVSS 3.1 · EPSS 5.3% (pctl 92)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 5.28% — more likely to be exploited than 92% of all CVEs |
| Weakness | CWE-200 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2022-02-16 |
| Last modified | 2026-06-17 |
Affected (6)
| Vendor | Product |
|---|---|
| fedoraproject | fedora |
| linux | linux kernel |
| oracle | communications cloud native core binding support function |
| oracle | communications cloud native core network exposure function |
| oracle | communications cloud native core policy |
| redhat | enterprise linux |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2004949
- https://citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024/
- https://www.oracle.com/security-alerts/cpujul2022.html
- https://bugzilla.redhat.com/show_bug.cgi?id=2004949
- https://citizenlab.ca/2024/07/vulnerabilities-in-vpns-paper-presented-at-the-privacy-enhancing-technologies-symposium-2024/
- https://security.netapp.com/advisory/ntap-20250328-0004/
- https://www.oracle.com/security-alerts/cpujul2022.html
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