What is the CVSS score of CVE-2024-39347?

CVE-2024-39347 has a CVSS 3.1 base score of 5.9 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N. EPSS exploitation probability: 0.5%.

Router Manager CVE-2024-39347

MEDIUM

Incorrect Default Permissions (CWE-276)

2024-06-28 security@synology.com

Privilege Escalation Synology Router Manager

5.9

CVSS 3.1 · Vendor: synology

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Vulnerability Assessment

Weakness	CWE CWE-276 OWASP Top 10:2025 A01:2025 - Broken Access Control ASVS 5.0 V13 - Configuration Default permission hardening MITRE ATT&CK 1 technique across 1 tactic: 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
Impact	CVSS score of 5.9 (MEDIUM). Attack characteristics: network attack vector, high complexity, no privileges required, no user interaction not required.
Exploit ScenarioDerived	A remote attacker could access resources due to overly permissive default settings by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

No patch listed yet 0.5% exploitation probability (EPSS)

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AnalysisAI

Incorrect default permissions vulnerability in firewall functionality in Synology Router Manager (SRM) before 1.2.5-8227-11 and 1.3.1-9346-8 allows man-in-the-middle attackers to access highly. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Set restrictive default permissions, follow principle of least privilege, review defaults during deployment.

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

This vulnerability is classified as Incorrect Default Permissions (CWE-276), which allows attackers to access resources due to overly permissive default settings. Incorrect default permissions vulnerability in firewall functionality in Synology Router Manager (SRM) before 1.2.5-8227-11 and 1.3.1-9346-8 allows man-in-the-middle attackers to access highly sensitive intranet resources via unspecified vectors. Affected products include: Synology Router Manager. Version information: before 1.2.5.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (synology) PRIMARY 5.9 MEDIUM

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

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

CVSS VectorVendor: synology

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

DescriptionCVE.org

Incorrect default permissions vulnerability in firewall functionality in Synology Router Manager (SRM) before 1.2.5-8227-11 and 1.3.1-9346-8 allows man-in-the-middle attackers to access highly sensitive intranet resources via unspecified vectors.

Threat Intelligence Overview

EPSS Score

0.5%

Top 59% exploitable

Data Quality

2 sources

Confidence: Low

NVD

CVE.org

EPSS

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 MEDIUM

CISA KEV No

Public POC No

EPSS 0.5%

Patch available No

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

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

None

System Exposure· derived

Open

Automatable· derived

Human Impact· derived

Medium

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +30

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Affected Products (CPE)CVE.org

cpe:2.3:o:synology:router_manager:*:*:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:-:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update1:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update10:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update2:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update3:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update4:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update5:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update6:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update7:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update8:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.2.5-8227:update9:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:-:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:update1:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:update2:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:update3:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:update4:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:update5:*:*:*:*:*:*

cpe:2.3:o:synology:router_manager:1.3.1-9346:update6:*:*:*:*:*:*

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References

Advisories & patches

ADVISORY https://www.synology.com/en-global/security/advisory/Synology_SA_23_16

Search Externally

GitHub PoC

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