CVE-2026-4309: Missing Authorization vulnerability in NEC Platforms, Ltd
29
Routine
MEDIUM 6.5REMOTEUPGRADEUPGRADEUPGRADE
CVE-2026-4309 is a medium-severity flaw (CVSS 6.5) affecting aterm wg2600hs firmware, aterm wf1200cr firmware, aterm wg1200cr firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Missing Authorization vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to get a specific device information and change the settings via network.
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
Published CVE record published
Updated Record last modified
nec aterm wg2600hs firmware UPGRADE
Affected: < 1.7.2
Fixed in: 1.7.2
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.
nec aterm wf1200cr firmware UPGRADE
Affected: < 1.6.0
Fixed in: 1.6.0
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 wg1200cr firmware UPGRADE
Affected: < 1.5.0
Fixed in: 1.5.0
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 wg2600hp4 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.
nec aterm wg2600hm4 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.
nec aterm wg2600hs2 firmware UPGRADE
Affected: < 1.3.2
Fixed in: 1.3.2
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 sourceNVD · 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-2026-4309?
aterm wg2600hs firmware: upgrade to 1.7.2; aterm wf1200cr firmware: upgrade to 1.6.0; aterm wg1200cr firmware: upgrade to 1.5.0. Exact commands for each OS are on this page.
Is CVE-2026-4309 being exploited?
CVE-2026-4309 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-2026-4309 affect?
CVE-2026-4309 affects aterm wg2600hs firmware, aterm wf1200cr firmware, aterm wg1200cr firmware. Severity is medium (CVSS 6.5). Missing Authorization vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to get a specific device information and change the settings via network.
How urgent is CVE-2026-4309?
Priority 29/100. Remotely exploitable, no login, no user action
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