CVE-2017-7522

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by...

6.5 MediumFix available

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

5.54%Up 4.5 points since Apr 14, 2021

What each source reports

NVD Score used 6.5

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: CVE-2017-7522
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness: CWE-20, CWE-476
Updated: 2026-11-02

CVE List No score

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: CVE-2017-7522
Weakness: CWE-20
Updated: 2026-11-02

EUVDEUVD-2017-16539 No score

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: EUVD-2017-16539
Updated: 2026-11-03

GitHub AdvisoriesGHSA-c6pr-p5hf-w49p 6.5

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by...

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: GHSA-c6pr-p5hf-w49p
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-20, CWE-476
Updated: 2026-11-02

OSV 6.5

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: CVE-2017-7522
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-7522 6.5

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: DEBIAN-CVE-2017-7522
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-7522 6.5

OpenVPN versions before 2.4.3 and before 2.3.17 are vulnerable to denial-of-service by authenticated remote attacker via sending a certificate with an embedded NULL character.

Record: UBUNTU-CVE-2017-7522
CVSS 3.0: 6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11128-1 No score

openvpn-2.5.3-1.2 on GA media

These are all security issues fixed in the openvpn-2.5.3-1.2 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11128-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`openvpn` Debian:12	before 2.4.3-1	2.4.3-1
`openvpn` Debian:13	before 2.4.3-1	2.4.3-1
`openvpn` Debian:14	before 2.4.3-1	2.4.3-1
`openvpn` openSUSE:Tumbleweed From an advisory covering 10 CVEs	before 2.5.3-1.2	2.5.3-1.2

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	affected
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-7522 is a medium vulnerability (CVSS 6.5) in Openvpn, published June 27, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.54%, the 92nd percentile. Fixed in openvpn 2.4.3-1.

References

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