What’s Vulnerable › Vulnerabilities

CVE-2023-1083: Welotec: improper access control in TK500v1 router series

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-09 · updated 2026-06-17
• Weakness: CWE-306

Description

An unauthenticated remote attacker who is aware of a MQTT topic name can send and receive messages, including GET/SET configuration commands, reboot commands and firmware updates.

Affected products

• Welotec TK515L: before 2.3.0.r5542 — fixed in 2.3.0.r5542
• Welotec TK525L: before 2.3.0.r5542 — fixed in 2.3.0.r5542
• Welotec TK525U: before 2.3.0.r5542 — fixed in 2.3.0.r5542
• Welotec TK525W: before 2.3.0.r5542 — fixed in 2.3.0.r5542
• Welotec TK535L1: before 2.3.0.r5542 — fixed in 2.3.0.r5542

How to fix

Upgrade to a fixed version: Welotec TK515L 2.3.0.r5542; Welotec TK525L 2.3.0.r5542; Welotec TK525U 2.3.0.r5542; Welotec TK525W 2.3.0.r5542; Welotec TK535L1 2.3.0.r5542. Check the vendor advisory for mitigations.

References

• https://cert.vde.com/en/advisories/VDE-2024-009
• https://cert.vde.com/en/advisories/VDE-2024-009

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