CVE-2026-11516: UTT HiPER 2610G Buffer Overflow Flaw

CVE-2026-11516 Overview

CVE-2026-11516 is a buffer overflow vulnerability in the UTT HiPER 2610G router through firmware version 3.0.0-171107. The flaw resides in the strcpy call within the /goform/formNatStaticMap handler, where the NatBinds argument is copied without bounds validation. An authenticated attacker on the adjacent network can manipulate this parameter to overflow the destination buffer. Public exploit details have been disclosed, increasing the likelihood of opportunistic exploitation against exposed management interfaces. The weakness is tracked under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer).

Critical Impact
Authenticated adjacent-network attackers can trigger a buffer overflow in the NAT static mapping handler, potentially corrupting router memory and disrupting network availability.

Affected Products

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

Discovery Timeline

2026-06-08 - CVE-2026-11516 published to NVD
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11516

Vulnerability Analysis

The vulnerability exists in the firmware's HTTP handler for NAT static mapping configuration. When a request reaches /goform/formNatStaticMap, the handler reads the NatBinds parameter from the request body and passes it directly to strcpy. Because strcpy copies bytes until a null terminator is found, supplying an oversized NatBinds value writes past the fixed-size destination buffer. The overflow can overwrite adjacent stack data, including saved return addresses on MIPS-based router hardware. The vulnerability requires valid administrative credentials and network reachability to the device's web interface.

Root Cause

The root cause is the use of the unbounded strcpy function on attacker-controlled input. The handler does not validate the length of NatBinds before copying it into a fixed-size buffer, violating safe string handling practices. Replacing strcpy with strncpy or equivalent bounded copy functions, paired with explicit length checks, would prevent the overflow.

Attack Vector

Exploitation requires adjacent-network access and low-privilege authenticated access to the router's web management interface. The attacker submits a crafted POST request to /goform/formNatStaticMap containing an oversized NatBinds value. The buffer overflow can crash the management daemon, causing denial of service, and may allow memory corruption depending on stack layout and compiler protections in the firmware build. Technical details and proof-of-concept materials are referenced in the GitHub Log Attack Documentation and VulDB entry for CVE-2026-11516.

Detection Methods for CVE-2026-11516

Indicators of Compromise

HTTP POST requests to /goform/formNatStaticMap containing unusually long NatBinds parameter values
Unexpected reboots, crashes, or restarts of the router's web management daemon
Authentication events from adjacent-network hosts followed by malformed configuration requests
Log entries referencing memory faults or watchdog-triggered restarts on the HiPER 2610G

Detection Strategies

Inspect web server and management daemon logs for requests to /goform/formNatStaticMap with parameter lengths exceeding expected NAT binding sizes
Deploy network intrusion detection signatures that match oversized NatBinds values in HTTP requests targeting UTT HiPER devices
Correlate administrative logins with subsequent configuration change failures or device resets to identify exploitation attempts

Monitoring Recommendations

Forward router syslog output to a central log aggregation platform and alert on repeated daemon restarts
Monitor management interface access for connections from unauthorized adjacent-network segments
Track baseline request sizes to /goform/* endpoints and flag statistical anomalies

How to Mitigate CVE-2026-11516

Immediate Actions Required

Restrict access to the router web management interface to trusted administrative VLANs only
Rotate administrative credentials and enforce strong, unique passwords on all HiPER 2610G devices
Disable remote management on WAN interfaces if not strictly required for operations
Audit existing NAT static mapping configurations for unexpected entries created by unauthorized users

Patch Information

No vendor patch has been published in the available references for firmware version 3.0.0-171107 of the UTT HiPER 2610G. Operators should monitor the VulDB advisory for CVE-2026-11516 and the UTT vendor portal for firmware updates addressing the strcpy call in formNatStaticMap.

Workarounds

Place HiPER 2610G management interfaces behind a jump host or bastion accessible only through authenticated VPN
Apply firewall ACLs that restrict TCP access to the device's HTTP management port to specific administrator workstations
Where feasible, replace end-of-support HiPER 2610G units with router models that receive active security maintenance

bash

# Example ACL restricting router management access to a single admin host
# Replace 192.0.2.10 with the authorized administrator workstation IP
# and 10.0.0.1 with the router management address

iptables -A FORWARD -s 192.0.2.10 -d 10.0.0.1 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 10.0.0.1 -p tcp --dport 80 -j DROP