# CVE-2026-75490: Cudy TR3000 before 2.5.42 Unauthenticated RCE via mDNS Automesh Broker Adoption

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

Cudy TR3000 before 2.5.42 contains a remote code execution vulnerability that allows unauthenticated adjacent attackers to run root commands by advertising a rogue automesh controller over mDNS. Attackers on the upstream Ethernet segment can advertise _cudycmagent._tcp records pointing to a malicious MQTT broker, then send commands encrypted with a fixed AES key that router/batchcmd.lua executes as root.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip

## Affected products and versions

- Shenzhen Cudy Technology Co., Ltd. / TR3000 1.0: ≥ 0; < 2.5.42 (affected, semver); 2.5.42 (unaffected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 7.7 (high); CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: VulnCheck

- CVSS 4.0: 7.7 (high); CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: disclosure@vulncheck.com

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: disclosure@vulncheck.com

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-306

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.cudy.com/en-us/pages/download-center/tr3000-1-0 (CNA: VulnCheck; release-notes)

- https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip (CNA: VulnCheck; patch)

- https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-unauthenticated-rce-via-mdns-automesh-broker-adoption (CNA: VulnCheck; third-party-advisory)

- https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip (disclosure@vulncheck.com)

- https://www.cudy.com/en-us/pages/download-center/tr3000-1-0 (disclosure@vulncheck.com)

- https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-unauthenticated-rce-via-mdns-automesh-broker-adoption (disclosure@vulncheck.com)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-75490; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75490; retrieved 2026-11-13; source updated 2026-11-13

Revision: 717b69ae0f5a2226c4e7e486cdf65b380cdc820a9dcec89937a9de706eeafd21

Canonical: https://y2.dev/cve/CVE-2026-75490

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