CVE-2026-35081 Overview
CVE-2026-35081 is an improper input validation vulnerability [CWE-20] in the ugw-logstop method. The flaw allows a remote attacker with low-privileged user access to terminate arbitrary processes on the affected system. The issue stems from insufficient validation of user-supplied input passed to the method, enabling abuse of the process termination functionality. CERT-VDE published advisory VDE-2026-039 detailing the issue.
Critical Impact
An authenticated remote attacker can terminate arbitrary processes, disrupting integrity and availability of services running on the affected device.
Affected Products
- Products exposing the ugw-logstop method (see CERT-VDE advisory VDE-2026-039)
- Specific affected versions are not enumerated in the NVD record
- Refer to the vendor advisory for the authoritative product list
Discovery Timeline
- 2026-06-03 - CVE CVE-2026-35081 published to NVD
- 2026-06-03 - Last updated in NVD database
Technical Details for CVE-2026-35081
Vulnerability Analysis
The vulnerability resides in the ugw-logstop method, which is exposed to authenticated users over the network. The method accepts user-supplied input that identifies the target of a logging stop operation. Because this input is not validated correctly, an attacker can pass arbitrary values that resolve to processes outside the intended scope.
When ugw-logstop processes the malicious input, it terminates the referenced process. This breaks the trust boundary between low-privileged users and the privileged process management functionality. The attacker does not need elevated permissions, only valid user credentials and network reachability to the management interface.
The primary impact is on integrity and availability. Terminating security agents, logging daemons, or service processes can disable monitoring, cause denial of service, or destabilize the device. Confidentiality is not directly affected by the flaw.
Root Cause
The root cause is improper input validation [CWE-20] in the ugw-logstop handler. The method trusts caller-supplied identifiers and does not enforce an allowlist or authorization check on the targeted process before issuing termination.
Attack Vector
Exploitation requires network access and authentication as a low-privileged user. The attacker invokes the ugw-logstop method with crafted input that targets a process outside the intended scope. No user interaction is required. See the CERT-VDE Security Advisory for technical specifics.
Detection Methods for CVE-2026-35081
Indicators of Compromise
- Unexpected termination of system services, security agents, or logging daemons on the affected device
- Audit log entries showing ugw-logstop invocations from non-administrative user accounts
- Gaps or abrupt stops in device log streams correlated with authenticated management sessions
Detection Strategies
- Monitor management API and CLI logs for calls to ugw-logstop and correlate against the invoking user role
- Alert on process termination events for critical services that lack a corresponding administrative action
- Baseline normal use of logging control methods and flag deviations from low-privileged accounts
Monitoring Recommendations
- Forward device audit logs to a centralized SIEM and retain authentication and method-invocation events
- Track service uptime and restart counts to detect repeated unauthorized terminations
- Review user accounts with network access to the management interface and validate least-privilege assignments
How to Mitigate CVE-2026-35081
Immediate Actions Required
- Restrict network access to the device management interface to trusted administrative networks only
- Audit user accounts and remove or downgrade accounts that do not require management access
- Apply the vendor-provided fix referenced in CERT-VDE advisory VDE-2026-039 once available for your product
Patch Information
Consult the CERT-VDE Security Advisory for affected products, fixed versions, and update instructions. The NVD entry does not list specific patched versions.
Workarounds
- Limit access to the management interface via network segmentation, firewall rules, or VPN-only access
- Enforce strong authentication and rotate credentials for accounts with access to the affected method
- Disable or block the ugw-logstop method at the network layer if not required for operations
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
