[NEW] [medium] OpenVPN: Multiple vulnerabilities allow bypassing security measures

mediumCVE-2026-63649 CVE-2026-63650

A local attacker can exploit multiple vulnerabilities in OpenVPN to bypass security measures.

CSIRTS triage

vendor: OpenVPN product: OpenVPN Authentication bypass

What: Multiple vulnerabilities allow local attackers to bypass security measures in OpenVPN.
Who is affected: OpenVPN installations where local access is possible are vulnerable.
Urgency: Medium severity with local-only attack vector; lower risk than remote vulnerabilities but impacts VPN security.
Action: Apply OpenVPN security patches and enforce strict local access controls on OpenVPN systems.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-10
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2707

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-636490.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-636500.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-63649	coverage & exploitation status	NVD · CVE.org
CVE-2026-63650	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for OpenVPN

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-63650: OpenVPN 2.7_alpha1 through 2.7.5 using mbedTLS allows remote authenticated users to be misiden…nvd · 2026-08-14
unknownCVE-2026-63649: The Windows interactive service in OpenVPN 2.4.0 through 2.6.21 and 2.7_alpha1 through 2.7.5 a…nvd · 2026-08-14
criticalCVE-2026-72841: luci-app-openvpn fails to properly validate the instance_name2 parameter during file upload, a…nvd · 2026-08-13
medium[NEW] [medium] OpenVPN: Vulnerability enables DoS and information disclosurecert-bund · 2026-08-13
high[NEW] [high] OpenVPN: Multiple vulnerabilitiescert-bund · 2026-08-13
medium[UPDATE] [medium] OpenVPN: Multiple vulnerabilitiescert-bund · 2026-08-13