CVE-2026-13122

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{"bugzilla": {"description": "openvpn: From CVEorg collector", "id": "2497374", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497374"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["OpenVPN version 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote attackers to cause a denial of service via a malformed authentication token that triggers a reachable assertion when external-auth is enabled", "A flaw was found in OpenVPN. A remote attacker can exploit this vulnerability by sending a malformed authentication token. This can trigger a reachable assertion when external authentication (external-auth) is enabled, leading to a Denial of Service (DoS) condition for the OpenVPN server."], "mitigation": {"lang": "en:us", "value": "To reduce exposure, disable the `external-auth` feature in OpenVPN if it is not required. This can be done by removing or commenting out the `external-auth` directive in the OpenVPN configuration file. If `external-auth` is necessary, restrict network access to the OpenVPN service to trusted clients through firewall rules. A restart of the OpenVPN service is required for configuration changes to take effect, which may temporarily disrupt active connections."}, "name": "CVE-2026-13122", "public_date": "2026-07-06T14:32:29Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-13122\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-13122\nhttps://community.openvpn.net/Security%20Announcements/CVE-2026-13122"], "statement": "A Moderate denial of service flaw exists in OpenVPN when configured with `external-auth`. Remote attackers can exploit this by sending a specially crafted authentication token, leading to a reachable assertion and service unavailability. This issue specifically impacts deployments where external authentication is enabled, increasing the attack surface.", "threat_severity": "Moderate"}

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