CVE-2026-4621
No known exploitation. EPSS puts it in the 15th percentile. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to enable telnet via network.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.3% chance of exploitation activity in the next 30 days, which ranks it in the 15th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
4 events over 24 days, from the signal feeds we watch.
- Patch availablerecord updated
- Publishedweakness classified
Affected products
- Aterm W1200EX(-MS)Networking Infrastructure / router-switch
- Aterm WG1200HP2Networking Infrastructure / router-switch
- Aterm WG1900HPNetworking Infrastructure / router-switch
- Aterm WG1200HS2Networking Infrastructure / router-switch
- Aterm WG1800HP3Networking Infrastructure / router-switch
- Aterm WG1200HP3Networking Infrastructure / router-switch
- Aterm WG1900HP2Networking Infrastructure / router-switch
- Aterm WG1200HS3Networking Infrastructure / router-switch
- aterm wg1200hp4 firmwareNetworking Infrastructure
- aterm wg2600hs firmwareNetworking Infrastructure
- aterm wf1200cr firmwareHardware Firmware
- aterm wg1200cr firmwareNetworking Infrastructure
- aterm wg2600hp4 firmwareNetworking Infrastructure / router-switch
- aterm wg2600hm4 firmwareNetworking Infrastructure / router-switch
- aterm wg2600hs2 firmwareNetworking Infrastructure / router-switch
- aterm wx3000hp firmwareNetworking Infrastructure / router-switch
And 30 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Scored 5.6 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity HighRequires specific conditions like a race condition or non-default configuration
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality LowSome restricted information is disclosed, but limited in scope
- Integrity LowData modification is possible but limited in scope or consequence
- Availability LowReduced performance or intermittent disruption of service
Weaknesses
Sources
References in the record
Watch the software you run.
My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.
We'll flag the next CVE, public exploit or patch for Aterm W1200EX(-MS), not every advisory.
A free account adds
- The full version matrix and every affected product
- Exploit links, proofs of concept and Metasploit modules
- Email alerts for the products you watch
- The same data over REST API, MCP and CLI