Welotec: improper access control in TK500v1 router series

published 2024-04-09 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-23370

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits: 0; none known

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.

Patch / fix

fixed in 14

Welotec TK515L 2.3.0.r5542, v2.3.0.r5542
Welotec TK515L Set v2.3.0.r5542
Welotec TK515L-W v2.3.0.r5542
Welotec TK515L-W Set v2.3.0.r5542
Welotec TK525L 2.3.0.r5542, v2.3.0.r5542
Welotec TK525L Set v2.3.0.r5542
Welotec TK525L-W v2.3.0.r5542
Welotec TK525L-W Set v2.3.0.r5542
Welotec TK525U 2.3.0.r5542, v2.3.0.r5542
Welotec TK525U Set v2.3.0.r5542
Welotec TK525W 2.3.0.r5542, v2.3.0.r5542
Welotec TK525W Set v2.3.0.r5542
Welotec TK535L1 2.3.0.r5542, v2.3.0.r5542
Welotec TK535L1 Set v2.3.0.r5542

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 2 y ago (2024-04-09)

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Welotec TK515L
Welotec TK515L Set
Welotec TK515L-W
Welotec TK515L-W Set
Welotec TK525L
Welotec TK525L Set
Welotec TK525L-W
Welotec TK525L-W Set
Welotec TK525U
Welotec TK525U Set
Welotec TK525W
Welotec TK525W Set
Welotec TK535L1
Welotec TK535L1 Set

Classification

Weakness

CWE-306 Missing Authentication for Critical Functionality

References

cert.vde.com /en/advisories/VDE-2024-009

Sources

CVE List CVE-2023-1083
NVD CVE-2023-1083

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary