CVE Alert: CVE-2025-9813 – Tenda – CH22

Risk verdict

High risk: remote, network-based exploitation with a publicly available exploit and high impact on confidentiality, integrity, and availability; treat with urgent attention pending KEV/SSVC exploitation state confirmation.

Why this matters

The vulnerability enables memory corruption via a network-facing endpoint with low privileges and no user interaction, allowing potential remote code execution. Real-world attackers could achieve full control and disrupt or exfiltrate data, with rapid propagation if unpatched.

Most likely attack path

An attacker sends crafted input over the network to the affected component, triggering a buffer overflow and memory corruption. With low prerequisites and no UI interaction, successful exploitation could yield high-impact access, potentially enabling persistence and lateral movement within the device or environment.

Who is most exposed

Devices deployed with exposed management interfaces or remote configuration capabilities are most at risk, particularly in networks where management ports are reachable from the internet or poorly segmented.

Detection ideas

• Surges in memory or process crashes linked to the affected service.
• Unexpected reboots or system instability following network probes to the management endpoint.
• IDS/IPS alerts for anomalous payloads targeting the endpoint or unusual Samba/config-related traffic.
• Logs showing failed or unusual attempts to send crafted payloads to the management interface.
• Signatures or indicators of the publicly available exploit in local memory or crash dumps.

Mitigation and prioritisation

• Apply vendor patch or upgrade to a fixed version as a top priority.
• If patching is delayed, disable remote management or restrict it to trusted networks; implement strong network segmentation.
• Enforce access controls and monitor for anomalous configuration change attempts.
• Amplify logging and rotate credentials; deploy host-based and network monitoring for exploitation indicators.
• If KEV or EPSS data later indicates active exploitation, escalate to Priority 1 and accelerate remediation.