CVE-2021-3773
CRITICALCVSS 9.8/10EPSS 5.32%
Last modified
CVE-2021-3773 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.. EPSS estimates a 5.32% chance of exploitation in the next 30 days.
Description
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 5.14 |
| Linux | Linux Kernel | >= 5.15, < 5.15.15 |
| Fedoraproject | Fedora | 34 |
| Redhat | Enterprise Linux | 6.0 |
| Redhat | Enterprise Linux | 7.0 |
| Redhat | Enterprise Linux | 8.0 |
| Oracle | Communications Cloud Native Core Binding Support Function | 22.1.3 |
| Oracle | Communications Cloud Native Core Network Exposure Function | 22.1.1 |
| Oracle | Communications Cloud Native Core Policy | 22.2.0 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2004949Issue Tracking, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2004949Issue Tracking, Third Party Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3773?
A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.
How severe is CVE-2021-3773?
CVE-2021-3773 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.32% probability of exploitation in the next 30 days.
How do I fix CVE-2021-3773?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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- CVE-2021-37729A remote path traversal vulnerability was discovered in Arub…6.5
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- CVE-2021-37732A remote arbitrary command execution vulnerability was disco…7.2
- CVE-2021-37733A remote path traversal vulnerability was discovered in Arub…4.9
- CVE-2021-37734A remote unauthorized read access to files vulnerability was…6.5
- CVE-2021-37735A remote denial of service vulnerability was discovered in A…5.3
Are you affected by CVE-2021-3773?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST