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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.

PUBLISHED Reserved 2026-06-05 | Published 2026-06-05 | Updated 2026-06-05 | Assigner VulnCheck




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

Problem types

Use of Hard-coded Credentials

Product status

Any version
affected

Credits

parsa rezaie khiabanloo finder

References

www.exploit-db.com/exploits/52183 (Exploit-DB) exploit

www.riello-ups.com/downloads/25-netman-204 (Vendor) product

www.vulncheck.com/...man-204-hard-coded-backdoor-credentials (VulnCheck Advisory: NetMan 204 Hard-coded Backdoor Credentials) third-party-advisory

cve.org (CVE-2025-71317)

nvd.nist.gov (CVE-2025-71317)

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