FutureNet AS-250/S: Authentication Bypass Using an Alternate Path or Channel
CVE-2025-24846 is a high-severity authentication bypass using an alternate path or channel vulnerability in FutureNet AS-250/S from Century Systems, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected FutureNet AS-250/S versions: firmware Version 1.14.0 and earlier. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.53% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Check which version of FutureNet AS-250/S you run against the affected versions below, and install the vendor's latest release.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Century Systems | FutureNet AS-250/S | firmware Version 1.14.0 and earlier | Not stated |
| Century Systems | FutureNet AS-250/F-SC | firmware Version 1.14.0 and earlier | Not stated |
| Century Systems | FutureNet AS-250/F-KO | firmware Version 1.14.0 and earlier | Not stated |
| Century Systems | FutureNet AS-250/NL | firmware Version 1.14.0 and earlier | Not stated |
| Century Systems | FutureNet AS-250/KL | firmware Version 1.14.0 and earlier | Not stated |
| Century Systems | FutureNet AS-250/KL Rev2 | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-250/L | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-M250/L | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-M250/KL | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-M250/NL | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-P250/NL | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-P250/KL | firmware Version 2.6.4 and earlier | Not stated |
| Century Systems | FutureNet AS-210/U4 | firmware Version 2.6.4 and earlier | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- NoneNothing can be modified.
- Availability
- NoneAvailability is not affected.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by CNA (jpcert.or.jp).
Official description
Authentication bypass vulnerability exists in FutureNet AS series (Industrial Routers) provided by Century Systems Co., Ltd. If this vulnerability is exploited, a remote unauthenticated attacker may obtain the device information such as MAC address by sending a specially crafted request.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Authentication Bypass Using an Alternate Path or Channel
The product requires authentication, but the product has an alternate path or channel that does not require authentication.
How developers prevent this class of flaw
- Funnel all access through a single choke point to simplify how users can access a resource. For every access, perform a check to determine if the user has permissions to access the resource.
More Authentication Bypass Using an Alternate Path or Channel vulnerabilities (CWE-288)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Recent Authentication Bypass Using an Alternate Path or Channel vulnerabilities
- 9.8 Critical severity
- 9.8 Critical severity
- 9.8 Critical severity
- 7.1 High severity
- 9.8 Critical severity
- 9.8 Critical severity
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