What’s Vulnerable › Vulnerabilities

CVE-2017-7521

• Severity: medium (CVSS 5.9 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2017-06-27 · updated 2026-06-17
• Weakness: CWE-400

Description

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to remote denial-of-service due to memory exhaustion caused by memory leaks and double-free issue in extract_x509_extension().

Affected products

• OpenVPN: through 2.3.16; 2.4.0, 2.4.0-alpha2, 2.4.0-beta1, 2.4.0-beta2, 2.4.0-rc1, 2.4.0-rc2 (+2)

References

• http://www.debian.org/security/2017/dsa-3900
• http://www.securityfocus.com/bid/99230
• http://www.securitytracker.com/id/1038768
• https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243
• http://www.debian.org/security/2017/dsa-3900
• http://www.securityfocus.com/bid/99230
• http://www.securitytracker.com/id/1038768
• https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243

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