What is the CVSS score of CVE-2026-7420?

CVE-2026-7420 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: 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. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-7420?

Yes, a public proof-of-concept exploit is available for CVE-2026-7420. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-7420?

Within 24 hours, inventory all UTT HiPER 1250GW deployments running firmware 3.2.7-210907-180535 or earlier, and implement temporary access restrictions to the web administration interface by limiting login to trusted IP addresses and disabling remote administration where feasible. Within 7 days, establish persistent network monitoring for exploitation attempts against the ConfigAdvideo handler and apply network segmentation to isolate affected routers from sensitive segments. Within 30 days, monitor UTT's security advisories for patched firmware and deploy it immediately upon release; until then, operate affected routers with minimal administrative access and continuous detection monitoring.

UTT HiPER 1250GW CVE-2026-7420

HIGH

Classic Buffer Overflow (CWE-120)

2026-04-29 VulDB

Buffer Overflow Hiper 1250Gw Utt

7.4

CVSS 4.0 · Vendor: VulDB

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Reach router web admin interface
Delivery

Authenticate with low-privilege credentials
Exploit

POST oversized 'Profile' to ConfigAdvideo
Execution

Overflow stack buffer via strcpy
Persist

Crash device or hijack control flow
Impact

Full compromise / denial of service

Vulnerability Assessment

Weakness	CWE CWE-120 ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Exploitation requires network access to the device's HTTP administration interface and a valid low-privilege authenticated session (CVSS PR:L) to reach the route/goform/ConfigAdvideo handler; the concrete trigger is supplying an over-length value in the 'Profile' argument to overflow the strcpy target buffer. No user interaction is needed (UI:N). Limiting factors: the attacker must be able to reach the management interface (mitigated when it is LAN-only or ACL-restricted) and must hold at least low-level credentials - this is not an unauthenticated PR:N flaw. Applies to firmware up to 3.2.7-210907-180535.
Impact	Signals are mixed. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N, VC/VI/VA:H, score 7.4) indicates a network-reachable, low-complexity attack requiring only low-privilege authentication, with total technical impact - consistent with the SSVC assessment (Exploitation: PoC, Automatable: no, Technical Impact: total). However, EPSS is extremely low at 0.04% (12th percentile), and the flaw is not on CISA KEV, so there is no evidence of active exploitation. The PR:L requirement means an attacker needs valid credentials or access to an authenticated session, which sharply limits mass exploitation and aligns with SSVC 'Automatable: no'. Net: this is a genuine total-impact bug with public PoC, but real-world urgency is moderate - prioritize for internet-exposed or multi-tenant deployments, lower for LAN-only devices behind authentication. Note the input CVSS is only a 4.0 vector; no CVSS 3.1 score was supplied, and PR:L rests on the vendor/VulDB assessment rather than an explicit description of the auth boundary.
Exploit ScenarioDerived	An attacker who has obtained low-privilege credentials (or hijacked an authenticated session) to a HiPER 1250GW sends a crafted HTTP POST to route/goform/ConfigAdvideo with an oversized 'Profile' parameter. The unbounded strcpy overflows the stack buffer, crashing the router (DoS) or, with a tuned payload, redirecting execution. Public exploit code documenting the overflow is already available, lowering the effort to reproduce.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 24, 2026

Remote code execution risk in the UTT HiPER 1250GW router (firmware up to 3.2.7-210907-180535) stems from an unbounded strcpy in the ConfigAdvideo web handler, where an oversized 'Profile' parameter overflows a stack buffer. Authenticated remote attackers (CVSS 4.0 PR:L) can crash the device or potentially hijack execution flow, achieving total impact on confidentiality, integrity, and availability. Publicly available exploit code exists per VulDB, though EPSS remains very low (0.04%) and there is no public exploit identified as actively used in the wild.

RemediationAI

No vendor-released patch identified at time of analysis; no fixed firmware version is cited in the available data, so contact UTT directly and monitor for a firmware release superseding 3.2.7-210907-180535. As compensating controls, restrict access to the web administration interface - do not expose the router's HTTP management port to the internet, and bind management to a trusted management VLAN or ACL-limited source addresses (trade-off: remote admin becomes inaccessible without VPN). Since exploitation requires low-privilege authentication, enforce strong, unique admin/user credentials and disable unused low-privilege accounts to raise the bar (trade-off: operational overhead). Where feasible, place the ConfigAdvideo/goform endpoints behind a reverse proxy or WAF rule that rejects oversized 'Profile' values (trade-off: may break legitimate long profile names). Reference the VulDB advisory at https://vuldb.com/vuln/360157 for tracking.

Affects your stack

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Technical ContextAI · show details

The HiPER 1250GW is a small-business gateway/router produced by Chinese vendor UTT (cpe:2.3:a:utt:hiper_1250gw). The vulnerability lives in the device's HTTP administration interface, specifically the route/goform/ConfigAdvideo endpoint that processes advertising/video configuration profiles. The root cause is CWE-120 (Classic Buffer Overflow / copy without checking input size): the handler passes the attacker-controlled 'Profile' argument directly to strcpy() into a fixed-size buffer with no length validation, a pattern endemic to embedded MIPS/ARM router firmware built on lightweight goform-style web servers. Overflowing this stack buffer corrupts adjacent memory and saved registers, enabling denial of service and, on many such SDKs, control-flow hijack.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (VulDB) PRIMARY 7.4 HIGH

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

vuln.today AI 8.8 HIGH

Network-reachable web handler with low-complexity strcpy overflow; PR:L reflects required low-privilege auth to the admin interface, and total impact yields C/I/A:H.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

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

Lifecycle Timeline

PoC Detected

Apr 30, 2026 - 14:52 vuln.today

Public exploit code

CVSS changed

Apr 29, 2026 - 23:22 NVD

8.8 (HIGH) 7.4 (HIGH)

CVE Published

Apr 29, 2026 - 22:30 nvd

HIGH 7.4

DescriptionCVE.org

A security flaw has been discovered in UTT HiPER 1250GW up to 3.2.7-210907-180535. Impacted is the function strcpy of the file route/goform/ConfigAdvideo. The manipulation of the argument Profile results in buffer overflow. The attack can be executed remotely. The exploit has been released to the public and may be used for attacks.

Executive ViewAI

Why It Matters

The UTT HiPER 1250GW router (firmware ≤3.2.7) contains a remote code execution vulnerability in the web administration interface requiring authenticated access. Publicly available exploit code exists, but active exploitation remains unreported. An authenticated attacker can overflow the stack buffer in the ConfigAdvideo handler, gaining full control over router confidentiality, integrity, and availability-directly compromising network infrastructure for affected organizations.

Business Impact: High

Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: restrict web administration access to trusted IP ranges only, disable remote administration if operationally feasible, limit user accounts with ConfigAdvideo function access, implement network segmentation to isolate affected routers, and deploy intrusion detection signatures targeting ConfigAdvideo buffer overflow patterns. Maintain heightened monitoring until vendor patch availability.

Threat Intelligence Overview

EPSS Score

0.0%

Top 88% exploitable

Prevalence

Low

niche Chinese SMB router vendor, limited enterprise footprint

Exploit

POC

Public exploit code exists

Social Media

Sightings

Data Quality

6 sources

Confidence: High

NVD

CVE.org

EPSS

Vulnrichment CIRCL

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

Poc

System Exposure· derived

Open

Automatable

Human Impact

High

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +37

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.