What is the CVSS score of CVE-2026-3815?

CVE-2026-3815 has a CVSS 3.1 base score of 8.8 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Is there a public PoC exploit available for CVE-2026-3815?

Yes, a public proof-of-concept exploit is available for CVE-2026-3815. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-3815?

Within 24 hours: inventory all UTT HiPER 810G devices in your environment and isolate affected systems from production networks if operationally feasible. Within 7 days: implement network segmentation to restrict access to the /goform/formApMail endpoint and apply WAF rules to block malicious requests; contact UTT for patch availability and timeline. Within 30 days: evaluate replacement with alternative vendors or devices with confirmed patch availability; establish a monitoring plan for suspicious administrative access attempts.

810g Firmware CVE-2026-3815

HIGH

Buffer Overflow (CWE-119)

2026-03-09 cna@vuldb.com

Buffer Overflow 810g Firmware Utt

8.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Authenticate to UTT HiPER 810G
Exploit

Send oversized input to /goform/formApMail
Execution

Trigger strcpy buffer overflow
Impact

Execute arbitrary code with device privileges

Vulnerability Assessment

Weakness	CWE CWE-119 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Bounds checking, buffer size validation MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation 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	UTT HiPER 810G version 1.7.7-1711 or earlier with valid user credentials required. Attacker must have network access to the management interface and valid authentication to reach the vulnerable /goform/formApMail endpoint.
Impact	CVSS 8.8 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network. Public exploit/POC available.
Exploit ScenarioDerived	A remote attacker could exploit this vulnerability to buffer overflow.

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

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Remote code execution in UTT HiPER 810G firmware through version 1.7.7-1711 via a buffer overflow in the /goform/formApMail handler allows authenticated attackers to achieve complete system compromise. Public exploit code exists for this vulnerability, and no patch is currently available, leaving affected devices at elevated risk. The attack requires network access but no user interaction, making it a significant threat to organizations using this device.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:56 CVSS 8.8

A weakness has been identified in UTT HiPER 810G up to 1.7.7-1711. This affects the function strcpy of the file /goform/formApMail. [CVSS 8.8 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-119 (Buffer Overflow). Affects 810G Firmware. A weakness has been identified in UTT HiPER 810G up to 1.7.7-1711. This affects the function strcpy of the file /goform/formApMail. Executing a manipulation can lead to buffer overflow. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.8 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 10, 2026 - 14:27 vuln.today

Public exploit code

CVE Published

Mar 09, 2026 - 11:16 nvd

HIGH 8.8

DescriptionCVE.org

A weakness has been identified in UTT HiPER 810G up to 1.7.7-1711. This affects the function strcpy of the file /goform/formApMail. Executing a manipulation can lead to buffer overflow. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks.

Executive ViewAI

Why It Matters

A critical buffer overflow vulnerability affects UTT HiPER 810G devices (versions up to 1.7.7-1711) that could allow unauthorized remote code execution through the mail configuration interface. Organizations using these devices face immediate risk of compromise, as public exploits are available and no patch has been released by the vendor.

Business Impact: High

Compensating Controls

Implement network-based access controls restricting administrative access to affected devices; deploy Web Application Firewall (WAF) rules to block requests to /goform/formApMail endpoint; disable remote mail configuration features if not operationally critical; segment affected devices on isolated network VLANs; enable logging and monitoring for authentication attempts and configuration changes; establish vendor communication protocol to track patch release timeline.

Threat Intelligence Overview

EPSS Score

0.1%

Top 79% exploitable

Exploit

POC

Public exploit code exists

Data Quality

5 sources

Confidence: Medium

NVD

CVE.org

EPSS

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 0.1%

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· derived

Scheduled

Exploitation· derived

Poc

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +44

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.