Skip to main content

OpenVPN EUVDEUVD-2026-41877

| CVE-2026-13698 MEDIUM
Memory Leak (CWE-401)
2026-07-02 GHSA-rwhm-c36w-484h
Information Disclosure Microsoft Red Hat Openvpn Suse
6.0
CVSS 4.0 · Vendor
Share

Severity by source

Vendor (CNA) PRIMARY
6.0 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/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

AT:P maps to AC:H for specific packet-sequence prerequisite; passive UI:P maps to UI:R; only availability impact applies with no scope change.

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

Primary rating from Vendor (CNA).

CVSS VectorVendor

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

4
Analysis Generated
Jul 06, 2026 - 15:40 vuln.today
CVSS changed
Jul 06, 2026 - 15:37 NVD
6.0 (MEDIUM)
CVE Published
Jul 02, 2026 - 10:57 github-releases
UNKNOWN (no severity yet)
CVE Published
Jul 02, 2026 - 10:57 github-releases
MEDIUM 6.0

Description PRE-NVD

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

AnalysisAI

Memory leak in OpenVPN (pre-2.7.5) allows network-accessible unauthenticated attackers to exhaust server memory, resulting in high availability impact and denial of service. The flaw, classified CWE-401, requires specific attack prerequisites (CVSS 4.0 AT:P) and passive client interaction (UI:P), meaning it is not trivially exploitable against all default deployments. No active exploitation has been confirmed in CISA KEV and no public exploit code has been identified at time of analysis; vendor patch v2.7.5 is available.

Technical ContextAI

OpenVPN is a mature, open-source SSL/TLS-based VPN solution widely used in enterprise and consumer environments. CVE-2026-13698 is classified under CWE-401 (Missing Release of Memory after Effective Lifetime), meaning heap-allocated memory is not freed under specific conditions, leading to unbounded memory growth. The vulnerability is distinct from two other flaws patched in the same v2.7.5 release: CVE-2026-13379 (DNS SearchList state pollution in openvpnserv on Windows) and CVE-2026-12996 (use-after-free in ack_write_buf() triggered by a well-timed control-channel and authentication packet sequence). The CVSS 4.0 vector AV:N/AC:L/AT:P indicates the leak is reachable over the network with low baseline complexity but requires a specific attack precondition - likely a particular client connection or packet sequence pattern. The impact metrics VC:N/VI:N/VA:H confirm availability-only consequences with no confidentiality or integrity breach on the vulnerable system and no lateral scope change.

RemediationAI

Upgrade to OpenVPN 2.7.5, the patched release confirmed at https://github.com/OpenVPN/openvpn/releases/tag/v2.7.5. Consult the vendor security advisory at https://community.openvpn.net/Security%20Announcements/CVE-2026-13698 for deployment-specific guidance. If immediate patching is not feasible, restrict access to the OpenVPN listener port (default UDP/TCP 1194) to trusted source IP ranges using host or perimeter firewall rules - this reduces exposure to the network-accessible attack vector at the cost of limiting legitimate remote access from uncontrolled ranges. Additionally, configure process-level memory limits or watchdog restart policies for the OpenVPN daemon so that memory exhaustion triggers a controlled restart rather than a full service outage, reducing the denial-of-service impact duration. Monitor for anomalous memory growth in the OpenVPN process as an early indicator of attempted exploitation.

More in Openvpn

View all
CVE-2018-7544 CRITICAL POC
9.1 Mar 16

A cross-protocol scripting issue was discovered in the management interface in OpenVPN through 2.4.5. Rated critical sev
CVE-2017-7478 HIGH POC
7.5 May 15

OpenVPN version 2.3.12 and newer is vulnerable to unauthenticated Denial of Service of server via received large control
CVE-2020-9442 HIGH POC
7.8 Feb 28

OpenVPN Connect 3.1.0.361 on Windows has Insecure Permissions for %PROGRAMDATA%\OpenVPN Connect\drivers\tap\amd64\win10,
CVE-2018-9336 HIGH POC
7.8 May 01

openvpnserv.exe (aka the interactive service helper) in OpenVPN 2.4.x before 2.4.6 allows a local attacker to cause a do
CVE-2017-5868 MEDIUM POC
6.1 May 26

CRLF injection vulnerability in the web interface in OpenVPN Access Server 2.1.4 allows remote attackers to inject arbit
CVE-2014-9104 MEDIUM POC
6.8 Nov 26

Multiple cross-site request forgery (CSRF) vulnerabilities in the XML-RPC API in the Desktop Client in OpenVPN Access Se
CVE-2023-46850 CRITICAL
9.8 Nov 11

Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execut
CVE-2019-25429 MEDIUM POC
6.1 Feb 19

Comodo Dome Firewall 2.7.0 contains a reflected cross-site scripting vulnerability that allows attackers to inject malic
CVE-2019-25428 MEDIUM POC
6.1 Feb 19

Comodo Dome Firewall 2.7.0 contains multiple reflected cross-site scripting vulnerabilities in the openvpn_users endpoin
CVE-2017-12166 CRITICAL
9.8 Oct 04

OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1
CVE-2024-1305 CRITICAL
9.8 Jul 08

tap-windows6 driver version 9.26 and earlier does not properly check the size data of incomming write operations which a
CVE-2024-27903 CRITICAL
9.8 Jul 08

OpenVPN plug-ins on Windows with OpenVPN 2.6.9 and earlier could be loaded from any directory, which allows an attacker

Same weakness CWE-401 – Memory Leak

View all
CVE-2020-13934 HIGH
7.5
CVE-2016-4232 HIGH POC
7.5
CVE-2024-25450 HIGH POC
8.8
CVE-2023-33718 HIGH POC
8.8
CVE-2019-6128 HIGH POC
8.8
CVE-2026-67183 HIGH POC
8.7
CVE-2023-34451 HIGH POC
8.2
CVE-2023-41484 HIGH POC
8.1

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
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

Share

EUVD-2026-41877 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy