CVE-2025-71317 | NetMan 204 contains a hard-coded backdoor account with the u… | CVSS 9.8 CRITICAL

Description

NetMan 204 contains a hard-coded backdoor account with the username and password 'eurek' that grants administrative access. A remote, unauthenticated attacker can authenticate through the cgi-bin/login.cgi endpoint (for example /cgi-bin/login.cgi?username=eurek&password=eurek, which due to lax parameter validation can be shortened to /cgi-bin/login.cgi?username=eurek%20eurek) to obtain administrator privileges, allowing them to alter device configuration, enable the telnet/SSH services, and reset local user credentials.

Metadata

CVE ID: CVE-2025-71317
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-06-05 16:56 UTC
Published: 2026-06-05 17:49 UTC
Last updated: 2026-06-05 19:35 UTC
Primary CWE: CWE-798
Use of Hard-coded Credentials
Vendor / Product: Riello UPS / NetMan 204
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Riello UPS	NetMan 204	—	—

Weakness (CWE)

CWE	Source	Description
CWE-798	cna	Use of Hard-coded Credentials

CVSS scores (2)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.3	CRITICAL	4.0	cna	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References (3)

Exploit-DB https://www.exploit-db.com/exploits/52183
Vendor https://www.riello-ups.com/downloads/25-netman-204
VulnCheck Advisory: NetMan 204 Hard-coded Backdoor Credentials https://www.vulncheck.com/advisories/netman-204-hard-coded-backdoor-credentials