7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2023-51842

CVE-2023-51842: MeshCentral algorithm-downgrade issue

An algorithm-downgrade issue was discovered in Ylianst MeshCentral 1.1.16.

(GitHub Advisory)

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CVE-2023-51842

CVE-2023-51842:

7.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
meshcentral	npm	< 1.1.17	1.1.17

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability stems from the TLS server configuration in the mpsserver.js file. The tls.createServer call in the else block explicitly enables TLS 1.0/1.1 (via minVersion: 'TLSv1') and uses a cipher string that includes deprecated algorithms (RC4, DES). The absence of @SECLEVEL=0 in the original cipher string (pre-patch) allowed OpenSSL's default security level to block these weak ciphers, but the server's forced support for outdated TLS versions still created a downgrade risk. The patch added @SECLEVEL=0 to explicitly allow these ciphers, but the core issue was the combination of outdated TLS versions and weak ciphers in the vulnerable configuration. The function is directly tied to the algorithm-downgrade vulnerability (CWE-757) described in the CVE.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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