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OpenVPN EUVDEUVD-2026-41880

| CVE-2026-13122 MEDIUM
Reachable Assertion (CWE-617)
2026-07-02 GHSA-m5x7-29rp-3xmr
Information Disclosure Microsoft Red Hat Openvpn Suse
5.9
CVSS 4.0 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
5.9 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.3 MEDIUM

Network-reachable DoS via assertion requires low-privilege auth and high-complexity timing; no confidentiality or integrity impact applies.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
P
Scope
X

Lifecycle Timeline

4
Analysis Generated
Jul 06, 2026 - 16:50 vuln.today
CVSS changed
Jul 06, 2026 - 16:22 NVD
5.9 (MEDIUM)
CVE Published
Jul 02, 2026 - 10:57 github-releases
UNKNOWN (no severity yet)
CVE Published
Jul 02, 2026 - 10:57 github-releases
MEDIUM 5.9

Description PRE-NVD

Disclosed via GitHub release of openvpn/openvpn. NVD scoring and full description are pending.

AnalysisAI

Denial-of-service in OpenVPN via a reachable assertion (CWE-617) allows a remote, low-privileged attacker to crash the OpenVPN daemon under high-complexity, timing-specific conditions. All OpenVPN deployments running versions prior to v2.7.5 are affected; the fix is available in the v2.7.5 release disclosed pre-NVD via GitHub. No public exploit code or CISA KEV listing has been identified at time of analysis; the CVSS 4.0 score of 5.9 (Medium) reflects the constrained exploitation path, though VPN service disruption carries meaningful operational impact for affected operators.

Technical ContextAI

CWE-617 (Reachable Assertion) identifies code paths where a runtime assert() or equivalent guard statement can be triggered by attacker-controlled input, causing the process to abort unconditionally. In OpenVPN, the vulnerability is reachable via the network-facing control channel under specific timing and packet-sequence conditions, as reflected by the CVSS 4.0 vector metrics AV:N/AC:H/AT:P. The AT:P (Attack Requirements: Present) metric confirms that specific preconditions beyond a default network connection are required. No CPE strings were included in the provided intelligence; the canonical product is openvpn:openvpn as tracked by NVD. The v2.7.5 release also addresses two distinct CVEs in the same package: CVE-2026-13379 (DNS SearchList state pollution in openvpnserv on Windows via --dns config interactions) and CVE-2026-12996 (use-after-free in ack_write_buf() triggered by a well-timed control channel and authentication packet sequence). CVE-2026-13122 is distinct from both of those; its precise code location is not confirmed due to truncation of the CVE description.

RemediationAI

Upgrade to OpenVPN v2.7.5 or later, which contains the confirmed fix as published at https://github.com/OpenVPN/openvpn/releases/tag/v2.7.5 and referenced in the vendor security announcement at https://community.openvpn.net/Security%20Announcements/CVE-2026-13122. The v2.7.5 release simultaneously patches CVE-2026-13379 and CVE-2026-12996, making the upgrade a high-priority single action for any OpenVPN deployment. If immediate upgrade is not operationally feasible, restrict access to the OpenVPN control-channel port (typically UDP/1194 or TCP/443) via perimeter firewall rules to allow only known, authorized client IP ranges - this does not eliminate the vulnerability but substantially raises the exploitation bar by reducing the attacker population who can reach the service. Monitor for unexpected OpenVPN daemon restarts or crashes as an indicator of exploitation attempts while patching is in progress.

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Server 15 SP7 Affected
SUSE Linux Enterprise Server 16.0 Affected

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EUVD-2026-41880 vulnerability details – vuln.today
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