What is the CVSS score of CVE-2026-55728?

CVE-2026-55728 has a CVSS 4.0 base score of 3.8 (Low). CVSS vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U. EPSS exploitation probability: 0.1%.

Lip Me20Xc CVE-2026-55728

EUVD-2026-48593 LOW

Stack-based Buffer Overflow (CWE-121)

2026-07-24 NCSC.ch

GHSA-r7g9-r28w-w2pq

Buffer Overflow Stack Overflow Lip Me20Xc L Inx L Gate L Roc L Iob L Dali L Vis L Pad Loytec

3.8

CVSS 4.0 · Vendor: NCSC.ch

View

Vulnerability Assessment

Weakness

CWE

CWE-121

ASVS 5.0

V15 - Secure Coding and Architecture Stack buffer bounds checking

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.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 26, 2026

Privilege escalation in Loytec ltsudo utility on LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS, and L-PAD through 8.4.16 allows a superadmin-group attacker to execute arbitrary code as root via a long interface-name argument to the cmd_ipaddr_conflict function. The vulnerability is a stack-based buffer overflow (CWE-121) in the SUID-root binary. No active exploitation or public exploit code identified at time of analysis.

Affected VersionsENISA

L-DALI 0 ≤8.4.16

L-GATE 0 ≤8.4.16

LIP-ME20xC 0 ≤8.4.16

L-IOB 0 ≤8.4.16

L-INX 0 ≤8.4.16

L-ROC 0 ≤8.4.16

L-VIS 0 ≤8.4.16

L-PAD 0 ≤8.4.16

Affected Packages

euvd l_dali no fix

euvd l_gate no fix

euvd l_inx no fix

euvd l_iob no fix

euvd l_pad no fix

euvd l_roc no fix

euvd l_vis no fix

euvd lip_me20xc no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 8 packages in euvd

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

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (NCSC.ch) PRIMARY 3.8 LOW

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

Primary rating from Vendor (NCSC.ch) · only source for this CVE.

CVSS VectorVendor: NCSC.ch

Attack Vector

Local

Attack Complexity

Low

Attack Requirements

Present

Privileges Required

High

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

Low

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

Stack-based Buffer Overflow (CWE-121) in /usr/bin/ltsudo cmd_ipaddr_conflict in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX-A64 allows a superadmin-group attacker to trigger a SUID-root process abort or potentially elevate privileges via an overly long interface-name argument.

Threat Intelligence Overview

EPSS Score

0.1%

Top 98% exploitable

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

Vulnrichment

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 LOW

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

LOW severity (CVSS 0.1-3.9)

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

Defer

Exploitation

None

System Exposure· derived

Small

Automatable

Human Impact· derived

Low

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +19

PoC: 0

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.

Stack-based Buffer Overflow HIGH

A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than it was allocated to hold.