CVE-2021-3547
Last modified
CVE-2021-3547 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in the verify-x509-name option in a client configuration.. EPSS estimates a 0.97% chance of exploitation in the next 30 days.
Description
OpenVPN 3 Core Library version 3.6 and 3.6.1 allows a man-in-the-middle attacker to bypass the certificate authentication by issuing an unrelated server certificate using the same hostname found in the verify-x509-name option in a client configuration.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Openvpn | Openvpn | 3.6 |
| Openvpn | Openvpn | 3.6.1 |
References
- https://community.openvpn.net/openvpn/wiki/CVE-2021-3547Patch, Vendor Advisory
- https://community.openvpn.net/openvpn/wiki/CVE-2021-3547Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-3547?
How severe is CVE-2021-3547?
How do I fix CVE-2021-3547?
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.
Related CVEs from 2021
- CVE-2021-35458Online Pet Shop We App 1.0 is vulnerable to Union SQL Inject…9.8
- CVE-2021-3546An out-of-bounds write vulnerability was found in the virtio…8.2
- CVE-2021-35463Cross-site scripting (XSS) vulnerability in the Frontend Tag…6.1
- CVE-2021-35464ForgeRock AM server before 7.0 has a Java deserialization vu…9.8
- CVE-2021-35465Certain Arm products before 2021-08-23 do not properly consi…3.4
- CVE-2021-35469The Lexmark Printer Software G2, G3 and G4 Installation Pack…7.8
- CVE-2021-35472An issue was discovered in LemonLDAP::NG before 2.0.12. Sess…8.8
- CVE-2021-35473An issue was discovered in LemonLDAP::NG before 2.0.12. Ther…9.1
- CVE-2021-35474Stack-based Buffer Overflow vulnerability in cachekey plugin…9.8
- CVE-2021-35475SAS Environment Manager 2.5 allows XSS through the Name fiel…5.4
- CVE-2021-35477In the Linux kernel through 5.13.7, an unprivileged BPF prog…5.5
- CVE-2021-35478Nagios Log Server before 2.1.9 contains Reflected XSS in the…5.4
Are you affected by CVE-2021-3547?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST