CVE Alert: CVE-2025-11653 – UTT – HiPER 2620G
CVE-2025-11653
A vulnerability was determined in UTT HiPER 2620G up to 3.1.4. Impacted is the function strcpy of the file /goform/fNTP. This manipulation of the argument NTPServerIP causes buffer overflow. It is possible to initiate the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
AI Summary Analysis
Risk verdict
High risk of remote code execution in UTT HiPER 2620G via fNTP strcpy buffer overflow; exploit publicly disclosed and available; treat as priority 1.
Why this matters
Successful exploitation can give an attacker full control of the device, enabling persistent access, firmware compromise, data exposure, and network pivot from the edge. With exploitation possible without user interaction and public PoC, any exposed HiPER 2620G instances in production raise the likelihood of targeted or opportunistic attacks.
Most likely attack path
Attacker needs network access to the device (AV:N) and only minimal privileges on the vulnerable component (PR:L), with no user interaction required (UI:N). By sending crafted data to NTPServerIP in /goform/fNTP, the strcpy overflow can corrupt memory, potentially yielding remote code execution (C/I/A authors). If compromise occurs, the attacker could leverage the device as a foothold for lateral movement or to harvest network information.
Who is most exposed
Devices deployed with exposed management interfaces or remote configuration capabilities in enterprise, ISP, or field deployments are most at risk, especially edge routers/gateways that expose NTP-related services to the network.
Detection ideas
- Anomalous or malformed NTPServerIP payloads observed hitting /goform/fNTP.
- Device crashes, watchdog resets, or memory corruption logs shortly after NTP activity.
- IDS/IPS signatures or CTI indicators related to this CVE in network traffic.
- Unexpected process terminations or core dumps on the appliance.
Mitigation and prioritisation
- Apply vendor patch/release to fixed firmware as soon as available; treat as priority 1.
- If patching is not immediate: restrict network access to management interfaces, disable or harden fNTP/NTPServerIP handling, and implement strict ACLs.
- Segment affected devices, monitor for abnormal reboot/crash events, and enable enhanced logging.
- Change-management: test in staging, schedule window for upgrade, validate post-patch stability.
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