CVE-2026-4620: OS Command Injection vulnerability in NEC Platforms, Ltd

Q: How do I fix CVE-2026-4620?

aterm wx3600hp firmware: upgrade to 1.5.3; aterm wx1500hp firmware: upgrade to 1.4.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-4620 being exploited?

CVE-2026-4620 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4620 affect?

CVE-2026-4620 affects aterm wx3600hp firmware, aterm wx1500hp firmware. Severity is critical (CVSS 9.8). OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS commands via network.

Q: How urgent is CVE-2026-4620?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2026-4620 is a critical-severity flaw (CVSS 9.8) affecting aterm wx3600hp firmware, aterm wx1500hp firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS commands via network.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-78
Published	2026-03-27
Last modified	2026-10-26

Publisher (CNA): NEC Corporation · Vendor: nec

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-27 12:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

nec aterm wx3600hp firmware UPGRADE

Affected: < 1.5.3

Fixed in: 1.5.3

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

nec aterm wx1500hp firmware UPGRADE

Affected: < 1.4.2

Fixed in: 1.4.2

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-4620?

aterm wx3600hp firmware: upgrade to 1.5.3; aterm wx1500hp firmware: upgrade to 1.4.2. Exact commands for each OS are on this page.

Is CVE-2026-4620 being exploited?

CVE-2026-4620 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-4620 affect?

CVE-2026-4620 affects aterm wx3600hp firmware, aterm wx1500hp firmware. Severity is critical (CVSS 9.8). OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS commands via network.

How urgent is CVE-2026-4620?

Priority 55/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-4619 CRITICAL 9.8 UPGRADE Path Traversal vulnerability in NEC Platforms, Ltd

References

← Back to latest CVEs