UpHeron
All vulnerabilities

Servers and applications

CVE-2017-7521

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().

Severity
Medium 5.9
Published
27 Jun 2017
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
3.9% in the next 30 daysHigher than 90% of CVEs. EPSS by FIRST, 11 Nov 2026
Weakness
Uncontrolled resource consumption (CWE-400)Double free (CWE-415)CWE-772
Attack
Over the network · Only under certain conditions · No login needed · No user action needed
Attacker can
Take it down
CVSS vector
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Sources
NVD

Affected software

SoftwareAffected versions
OpenVPNServers and applications · cpe:a:openvpn:openvpn
  • Version 2.4.2
  • Version 2.4.1
  • Version 2.4.0
  • Version 2.4.0-rc2
All 9 release lines
  • Every version up to 2.3.16
  • Version 2.4.0-alpha2
  • Version 2.4.0-beta1
  • Version 2.4.0-beta2
  • Version 2.4.0-rc1
  • Version 2.4.0-rc2
  • Version 2.4.0
  • Version 2.4.1
  • Version 2.4.2

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2017-7521
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2017-7521