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.
CVE-2017-7522
MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence
Score 6.5 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 6.5Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EG Risk
- 36(Track)EG Risk 36/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation6% × 40%Automatability30% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 6%
- EPSS %ILE
- 92%
- KEV
- Not listed
Published
June 27, 2017
Last Modified
June 17, 2026
References (6)
- secalert@redhathttp://www.securityfocus.com/bid/99230
- secalert@redhathttp://www.securitytracker.com/id/1038768
- secalert@redhathttps://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243
- af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/99230
- af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1038768
- af854a3a-2127-422b-91ae-364da2661108https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243
Frequently asked(5)
What is CVE-2017-7522?
CVE-2017-7522 is a medium vulnerability published on June 27, 2017. 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.
When was CVE-2017-7522 disclosed?
CVE-2017-7522 was first published in the National Vulnerability Database on June 27, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-7522 actively exploited?
CVE-2017-7522 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 8.0% of all scored CVEs.
What is the CVSS score of CVE-2017-7522?
CVE-2017-7522 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2017-7522?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-7522, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2017-7522
Is Your Infrastructure Affected by CVE-2017-7522?
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