CVE-2020-5524

Root command execution via UPnP command injection

Published Feb 21, 2020 · Updated Aug 4, 2024

OS command injection in NEC Platforms Aterm firmware allows remote attackers on the same network segment to execute commands as root. The UPnP function places attacker-controlled input into an OS command context without adequate neutralization; neither NEC nor JVN identifies the handler or parameter. Access to the device's UPnP interface from the adjacent network is required, and successful exploitation grants root-level command execution on the router.

CVSS severity8.8
High
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in NEC Platforms Aterm firmware allows remote attackers on the same network segment to execute commands as root. The UPnP function places attacker-controlled input into an OS command context without adequate neutralization; neither NEC nor JVN identifies the handler or parameter. Access to the device's UPnP interface from the adjacent network is required, and successful exploitation grants root-level command execution on the router.

The record

CVE
CVE-2020-5524
Published
Feb 21, 2020
Updated
Aug 4, 2024
Vendor
NEC Platforms, Ltd.
Product
Aterm
Classifications
CWE-78, T1059
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 21, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 and earlier

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

NEC Platforms, Ltd. · Atermversion=Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 and earlier

Published CVSS scores

8.3JPCERT/CC JVNAV:A/AC:L/Au:N/C:C/I:C/A:C
8.8JPCERT/CC JVNCVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3NIST NVDAV:A/AC:L/Au:N/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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