CVE-2021-3773

Description

A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.47%
Third-Party Advisory redhat.com Third-Party Advisory oracle.com
Affected: n/a kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=2004949 issue tracking third party advisory
https://www.oracle.com/security-alerts/cpujul2022.html third party advisory patch
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/

Frequently Asked Questions

What is the severity of CVE-2021-3773?
CVE-2021-3773 has been scored as a critical severity vulnerability.
How to fix CVE-2021-3773?
To fix CVE-2021-3773, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-3773 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-3773 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-3773?
CVE-2021-3773 affects n/a kernel.
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