Vulnerability · Published Jun 5, 2026 · Assigned by VulnCheck

CVE-2025-71317NetMan 204 Hard-coded Backdoor Credentials

Critical 9.8

In plain English

A critical-severity hard-coded credentials in NetMan 204 from Riello UPS. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.4%top 62.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Riello UPS	NetMan 204	0

Weakness: CWE-798 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Exploit-DB exploit
Vendor product
VulnCheck Advisory: NetMan 204 Hard-coded Backdoor Credentials third-party-advisory