CVE-2026-76003Public exploitNetwork attack vector

Memory corruption via unchecked timestart strcpy

Published Aug 19, 2026 · Updated Aug 19, 2026

Stack-based buffer overflow in UTT HiPER 1200GW 2.5.3-170306 allows remote authenticated users to crash the device via timestart. The /goform/formGroupConfig handler copies the POST timestart value with strcpy into a stack buffer without a length check, so an oversized field overwrites adjacent stack memory. The published proof of concept uses an HTTP Digest-authenticated request to the management interface, so exposure depends on network reachability of remote administration and valid credentials.

CVSS severity9.9
Critical
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer overflow in UTT HiPER 1200GW 2.5.3-170306 allows remote authenticated users to crash the device via timestart. The /goform/formGroupConfig handler copies the POST timestart value with strcpy into a stack buffer without a length check, so an oversized field overwrites adjacent stack memory. The published proof of concept uses an HTTP Digest-authenticated request to the management interface, so exposure depends on network reachability of remote administration and valid credentials.

The record

CVE
CVE-2026-76003
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
Shanghai Aitai Technology Co., Ltd.
Product
HiPER 1200GW
Classifications
CWE-119, CWE-121, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.5.3-170306

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Shanghai Aitai Technology Co., Ltd. · HiPER 1200GWversion=2.5.3-170306

Published CVSS scores

9.9VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.6VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
9.0VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121Stack-based Buffer Overflow
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo