CVE-2026-31060 Overview
CVE-2026-31060 is a buffer overflow vulnerability in the UTT Aggressive HiPER 810G v3 router firmware version 1.7.7-171114. The flaw exists in the notes parameter of the formGroupConfig function. An attacker on an adjacent network with high privileges can submit crafted input to trigger the overflow and cause a Denial of Service (DoS) condition. The vulnerability is classified under [CWE-120] (Buffer Copy without Checking Size of Input). No exploit is publicly available, and the issue is not listed in the CISA Known Exploited Vulnerabilities catalog.
Critical Impact
Authenticated adjacent-network attackers can crash the router by sending oversized input to the notes parameter, disrupting network availability for connected clients.
Affected Products
- UTT Aggressive HiPER 810G hardware revision 3.0
- UTT 810G firmware version 1.7.7-171114
- Deployments exposing the formGroupConfig endpoint on adjacent networks
Discovery Timeline
- 2026-04-06 - CVE-2026-31060 published to NVD
- 2026-04-10 - Last updated in NVD database
Technical Details for CVE-2026-31060
Vulnerability Analysis
The vulnerability resides in the formGroupConfig function of the UTT 810G router's web management interface. The function processes the notes parameter without enforcing length limits on incoming data. When an attacker submits a payload that exceeds the destination buffer size, adjacent memory regions are overwritten. The resulting memory corruption causes the affected process to terminate, producing a Denial of Service condition on the device.
Exploitation requires authenticated access and adjacency to the target network, which limits the attack surface. The vulnerability does not provide a path to confidentiality or integrity compromise, but successful exploitation removes the router from service until the device restarts or operators intervene.
Root Cause
The root cause is the absence of input length validation on the notes parameter before it is copied into a fixed-size stack or heap buffer. The firmware relies on client-supplied data without enforcing bounds, which is a classic instance of [CWE-120]. Routers in this product family share a common HTTP handler pattern, suggesting similar code paths may exist in other form parameters.
Attack Vector
An attacker authenticated to the router with high privileges sends a crafted HTTP request to the formGroupConfig endpoint. The request includes a notes parameter populated with a string longer than the expected buffer capacity. Because the firmware copies the value without bounds checks, the process crashes and network services hosted by the router become unavailable.
For technical details and proof-of-concept analysis, see the GitHub PoC Repository.
Detection Methods for CVE-2026-31060
Indicators of Compromise
- Unexpected reboots or service restarts on UTT 810G routers running firmware 1.7.7-171114
- HTTP POST requests to the router management interface targeting formGroupConfig with abnormally long notes values
- Authenticated administrative sessions originating from unexpected adjacent-network hosts
Detection Strategies
- Inspect web management logs for requests to formGroupConfig containing oversized parameter values
- Correlate router crash events with preceding administrative HTTP requests from the local network
- Alert on repeated authentication attempts to the router management interface from non-administrative VLANs
Monitoring Recommendations
- Forward router syslog and web management logs to a centralized log platform for retention and analysis
- Monitor availability of the router with active probes and alert on unexpected downtime
- Track changes to administrative credentials and session activity on the device
How to Mitigate CVE-2026-31060
Immediate Actions Required
- Restrict access to the router web management interface to dedicated administrative VLANs or jump hosts
- Rotate administrative credentials and enforce strong, unique passwords for the router admin account
- Disable remote management features that are not required for operations
Patch Information
No vendor advisory or firmware patch has been published in the references available for CVE-2026-31060. Operators should monitor UTT communications for an updated firmware release that addresses the formGroupConfig input validation issue and apply it once available.
Workarounds
- Place the router management interface behind a firewall rule that only permits trusted administrator IP addresses
- Segment user networks from management networks to remove adjacent-network attack paths
- Replace the device with a supported model if the vendor does not release a fix within an acceptable timeframe
# Configuration example: restrict management access using upstream ACL
# Permit only the admin workstation to reach the router management IP
access-list 110 permit tcp host 10.10.10.5 host 192.168.1.1 eq 80
access-list 110 permit tcp host 10.10.10.5 host 192.168.1.1 eq 443
access-list 110 deny tcp any host 192.168.1.1 eq 80
access-list 110 deny tcp any host 192.168.1.1 eq 443
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
