CVE-2026-11517: UTT HiPER 2610G Buffer Overflow Flaw

CVE-2026-11517 Overview

CVE-2026-11517 is a buffer overflow vulnerability affecting UTT HiPER 2610G routers running firmware versions up to 3.0.0-171107. The flaw resides in the strcpy call within the /goform/formConfigDnsFilterGlobal handler. Attackers can manipulate the GroupName argument to overflow a fixed-size buffer and corrupt adjacent memory. The vulnerability is exploitable over the network and requires only low-privilege authentication. A public proof-of-concept has been disclosed, increasing the likelihood of opportunistic exploitation against exposed devices.

Critical Impact
Remote authenticated attackers can trigger a buffer overflow in the router's web management interface, potentially leading to arbitrary code execution or denial of service on the affected device.

Affected Products

UTT HiPER 2610G router
Firmware versions up to and including 3.0.0-171107
Web management component /goform/formConfigDnsFilterGlobal

Discovery Timeline

2026-06-08 - CVE-2026-11517 published to the National Vulnerability Database (NVD)
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11517

Vulnerability Analysis

The vulnerability is classified under [CWE-119] as an improper restriction of operations within the bounds of a memory buffer. The web management interface of the UTT HiPER 2610G router exposes the /goform/formConfigDnsFilterGlobal endpoint, which processes DNS filter group configuration requests. The handler copies the user-controlled GroupName parameter into a fixed-size stack buffer using strcpy, an unsafe function that performs no length validation.

When the attacker supplies a GroupName value longer than the destination buffer, strcpy writes past the buffer boundary. This corrupts adjacent stack data, including saved registers and return addresses. Depending on the memory layout and any mitigations present on the embedded MIPS/ARM platform, the corruption can crash the web service or allow control of program execution.

Root Cause

The root cause is the unchecked use of strcpy against attacker-controlled input from an HTTP form parameter. The firmware lacks input length validation before the copy operation. Embedded router firmware often omits stack canaries and address space layout randomization (ASLR), which removes typical exploitation barriers.

Attack Vector

The attack vector is network-based and requires authenticated access to the router's management interface. An attacker sends a crafted HTTP POST request to /goform/formConfigDnsFilterGlobal containing an oversized GroupName parameter. Devices exposing the management interface to the WAN or to untrusted network segments are at elevated risk. A public proof-of-concept is hosted on a GitHub PoC Repository, and additional details are tracked at VulDB CVE-2026-11517.

Detection Methods for CVE-2026-11517

Indicators of Compromise

HTTP POST requests to /goform/formConfigDnsFilterGlobal containing abnormally long GroupName parameter values
Repeated crashes or restarts of the router's httpd or web management process
Unexpected configuration changes to DNS filter groups in router logs
Outbound connections from the router to attacker-controlled infrastructure following management interface activity

Detection Strategies

Inspect HTTP traffic destined for router management interfaces and flag requests where GroupName exceeds expected length thresholds
Apply intrusion detection signatures that match oversized form parameters submitted to /goform/ endpoints on UTT devices
Correlate authentication events on the router with subsequent service restarts to identify exploitation attempts

Monitoring Recommendations

Centralize router syslog data and alert on repeated web service failures or watchdog resets
Monitor administrative logins to the HiPER 2610G from non-management network segments
Track changes to the device firmware version and configuration state for unauthorized modifications

How to Mitigate CVE-2026-11517

Immediate Actions Required

Restrict access to the router's web management interface to trusted management VLANs and remove any WAN-side exposure
Rotate administrative credentials and enforce strong, unique passwords to limit the low-privilege precondition required for exploitation
Audit existing DNS filter group configurations for unexpected entries that may indicate prior exploitation attempts
Disable remote management features that are not strictly required

Patch Information

No vendor patch has been referenced in the published advisory at the time of writing. Administrators should consult UTT for firmware updates addressing the strcpy issue in /goform/formConfigDnsFilterGlobal and review the entries at VulDB Vulnerability #369137 for tracking updates.

Workarounds

Place the router's management interface behind a dedicated jump host or VPN, blocking direct access from user and guest networks
Use upstream firewall rules to drop HTTP/HTTPS requests to the router from untrusted sources
Where feasible, replace end-of-support hardware with current models that receive active security maintenance

bash

# Example upstream ACL restricting management access to a trusted subnet
# Replace 192.0.2.0/24 with your management network
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -s 192.0.2.0/24 -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 80 -j DROP
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -s 192.0.2.0/24 -j ACCEPT
iptables -A FORWARD -p tcp -d <router_ip> --dport 443 -j DROP