VulnerabilityPublished 20 Mar 2026

CVE-2026-4487: UTT HiPER 1200GW · Buffer Overflow

Affects UTT HiPER 1200GWSource CVE Database V5

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Public exploit available · CVSS 8.7 High.

Data as of 1 Nov 2026, 08:20 UTC

CVSS 4.0 base score

8.7High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.5% chance of exploitation in 30 days – higher than 43% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: High
Vulnerable system integrity: High
Vulnerable system availability: High
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: High: There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Vulnerable system integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the vulnerable system. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the vulnerable system.
Vulnerable system availability: High: There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the Vulnerable System; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the Vulnerable System (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Mar 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
UTTHiPER 1200GW	Affected =2.5.3-170306	Fixed in–
GitHubhmkunlun/UTTHiPER`pkg:github/hmkunlun/UTTHiPER`Other threats	Affected =2.5.3-170306	Fixed in–

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AI-suggested

To mitigate CVE-2026-4487, organizations should immediately restrict external access to the UTT HiPER 1200GW management interfaces, especially the /goform/websHostFilter endpoint, using firewalls or access control lists. Network segmentation should be employed to isolate these devices from untrusted networks and limit exposure. Monitoring network traffic for unusual requests targeting the vulnerable endpoint can help detect exploitation attempts early. If possible, disable or limit the functionality of the affected web interface until a vendor patch is available. Organizations should engage with UTT for firmware updates or security advisories and apply patches promptly once released. Employing intrusion detection/prevention systems (IDS/IPS) with signatures targeting this vulnerability can provide additional defense. Regularly auditing device configurations and logs can help identify signs of compromise. As a longer-term measure, organizations should evaluate the security posture of embedded devices and consider replacing outdated or unsupported hardware with more secure alternatives.

Description

CVE-2026-4487 is a high-severity buffer overflow vulnerability in UTT HiPER 1200GW devices up to version 2.5.3-170306. The flaw exists in the strcpy function within the /goform/websHostFilter endpoint, allowing remote attackers to trigger a buffer overflow without authentication or user interaction. Exploitation could lead to complete compromise of the affected device, impacting confidentiality, integrity, and availability. Although no known exploits are currently observed in the wild, the vulnerability has been publicly disclosed, increasing the risk of exploitation. Organizations using these devices should prioritize patching or mitigating this issue to prevent potential remote code execution or denial of service. The vulnerability affects network infrastructure devices, making it critical for environments relying on UTT HiPER 1200GW for connectivity or security. Countries with significant deployments of UTT devices and strategic reliance on such network equipment are at higher risk. Immediate mitigation steps include restricting access to the vulnerable endpoint, network segmentation, and monitoring for anomalous activity targeting the device.

Impact

The impact of CVE-2026-4487 is significant for organizations using UTT HiPER 1200GW devices, as exploitation could lead to full device compromise. This includes unauthorized access to sensitive network traffic, disruption of network services, and potential lateral movement within the network. Confidentiality is at risk due to possible interception or manipulation of data passing through the compromised gateway. Integrity can be undermined by attackers altering device configurations or injecting malicious payloads. Availability may be affected if the device is crashed or rendered inoperable through the buffer overflow. Given the device’s role as a network gateway, such disruptions could cascade, affecting broader organizational operations and critical infrastructure. The remote, unauthenticated nature of the exploit increases the threat level, as attackers can target devices exposed to the internet or accessible from less secure network segments. This vulnerability could be leveraged in targeted attacks against organizations or in widespread automated scanning and exploitation campaigns once exploit code becomes widely available.

Summary

CVE-2026-4487 identifies a buffer overflow vulnerability in the UTT HiPER 1200GW device firmware up to version 2.5.3-170306. The vulnerability arises from unsafe use of the strcpy function in the /goform/websHostFilter web endpoint, which does not properly validate input length, allowing an attacker to overflow the buffer. This flaw can be exploited remotely without requiring authentication or user interaction, making it highly accessible to attackers. The buffer overflow can lead to arbitrary code execution, enabling attackers to take full control of the device, disrupt its operation, or manipulate network traffic. The CVSS 4.0 score of 8.7 reflects the high impact on confidentiality, integrity, and availability, combined with the low attack complexity and no need for privileges or user interaction. Although no active exploits have been reported in the wild, the public disclosure of the vulnerability increases the likelihood of exploitation attempts. The affected product, UTT HiPER 1200GW, is a network gateway device used in various organizational environments, potentially exposing critical network infrastructure to compromise. The lack of available patches at the time of disclosure necessitates immediate mitigation efforts to reduce risk. The vulnerability highlights the dangers of unsafe string handling in embedded device firmware and the importance of secure coding practices.

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What to do

Affected software

Description

AI analysisMachine-generated, updated 27 Mar 2026, 19:44 UTC

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