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CVE-2021-20712

No known exploitation. EPSS puts it in the 56th percentile. Only a workaround so far.

CVSS 3.15.3MediumEPSS percentile56th0.8% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFixWorkaroundNo fixed build yet

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

No fixed build is published yet. The vendor describes a workaround.

  • NEC Corporation NEC Aterm devicesAffected: Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware…Upgrade to: not statedStated by: CVE record
  • Nec Aterm Wg2600hs FirmwareAffected: ≤ 1.5.1Upgrade to: after 1.5.1Stated by: NVD
  • Nec Aterm Wx3000hp FirmwareAffected: ≤ 1.1.2Upgrade to: after 1.1.2Stated by: NVD

Versions as the sources state them. Full version matrix after sign-in

What it is

From the CVE record

Improper access control vulnerability in NEC Aterm WG2600HS firmware Ver1.5.1 and earlier, and Aterm WX3000HP firmware Ver1.1.2 and earlier allows a device connected to the LAN side to be accessed from the WAN side due to the defect in the IPv6 firewall function.

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.

EPSS56th
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

0.8% chance of exploitation activity in the next 30 days, which ranks it in the 56th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

4 events over 1305 days, from the signal feeds we watch.

  1. Workaround availablerecord updated
  2. Publishedweakness classified

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 5.3 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • 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 NoneNo integrity impact
  • Availability NoneNo availability impact

Weaknesses

Sources

References in the record

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We'll flag the next CVE, public exploit or patch for NEC Aterm devices, not every advisory.