CVE-2023-26866: GreenPacket OH736's WR-1200 Indoor Unit, OT-235 with firmware versions M-IDU-1.6.0.3_V1.1 and MH-46360-2.0.3-R

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CRITICAL 9.8REMOTEMITIGATEMITIGATE

CVE-2023-26866 is a critical-severity flaw (CVSS 9.8) affecting wr-1200 firmware, ot-235 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GreenPacket OH736's WR-1200 Indoor Unit, OT-235 with firmware versions M-IDU-1.6.0.3_V1.1 and MH-46360-2.0.3-R5-GP respectively are vulnerable to remote command injection. Commands are executed using pre-login execution and executed with root privileges allowing complete takeover.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.3% (top 17%)
CISA exploited list	No
Weakness	CWE-77
Published	2023-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: greenpacket

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-04-04 13:15 UTCPublished CVE record published
2026-06-17 05:43 UTCUpdated Record last modified

greenpacket wr-1200 firmware MITIGATE

Affected: m-idu-1.6.0.3_v1.1

Fixed in: no fixed release known

Safe to downgrade to: a release before m-idu-1.6.0.3_v1.1

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.

greenpacket ot-235 firmware MITIGATE

Affected: m-idu-1.6.0.3_v1.1 · mh-46360-2.0.3-r5-gp

Fixed in: no fixed release known

Safe to downgrade to: a release before m-idu-1.6.0.3_v1.1

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-2023-26866?

wr-1200 firmware: mitigate or apply the listed mitigation; ot-235 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-26866 being exploited?

CVE-2023-26866 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-2023-26866 affect?

CVE-2023-26866 affects wr-1200 firmware, ot-235 firmware. Severity is critical (CVSS 9.8). GreenPacket OH736's WR-1200 Indoor Unit, OT-235 with firmware versions M-IDU-1.6.0.3_V1.1 and MH-46360-2.0.3-R5-GP respectively are vulnerable to remote command injection. Commands are executed using pre-login execution and executed with ro

How urgent is CVE-2023-26866?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

References

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