CVE-2023-23906: Missing authentication for critical function exists in SkyBridge MB-A100/110 firmware Ver

Q: How do I fix CVE-2023-23906?

skybridge mb-a110 firmware: upgrade to newer than 4.2.0; skybridge mb-a100 firmware: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Q: Is CVE-2023-23906 being exploited?

CVE-2023-23906 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-2023-23906 affect?

CVE-2023-23906 affects skybridge mb-a110 firmware, skybridge mb-a100 firmware. Severity is high (CVSS 7.5). Missing authentication for critical function exists in SkyBridge MB-A100/110 firmware Ver. 4.2.0 and earlier, which may allow a remote unauthenticated attacker to execute some critical functions without authentication, e.g., rebooting the p

Q: How urgent is CVE-2023-23906?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADEUPGRADE

CVE-2023-23906 is a high-severity flaw (CVSS 7.5) affecting skybridge mb-a110 firmware, skybridge mb-a100 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Missing authentication for critical function exists in SkyBridge MB-A100/110 firmware Ver. 4.2.0 and earlier, which may allow a remote unauthenticated attacker to execute some critical functions without authentication, e.g., rebooting the product.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-306
Published	2023-05-10
Last modified	2026-06-17

Publisher (CNA): JPCERT/CC · Vendor: seiko-sol

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

Am I affected?

Timeline

2023-05-10 06:15 UTCPublished CVE record published
2026-06-17 05:38 UTCUpdated Record last modified

seiko-sol skybridge mb-a110 firmware UPGRADE

Affected: <= 4.2.0

Fixed in: newer than 4.2.0

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.

seiko-sol skybridge mb-a100 firmware UPGRADE

Affected: <= 4.2.0

Fixed in: newer than 4.2.0

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.

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-2023-23906?

skybridge mb-a110 firmware: upgrade to newer than 4.2.0; skybridge mb-a100 firmware: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.

Is CVE-2023-23906 being exploited?

CVE-2023-23906 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-2023-23906 affect?

CVE-2023-23906 affects skybridge mb-a110 firmware, skybridge mb-a100 firmware. Severity is high (CVSS 7.5). Missing authentication for critical function exists in SkyBridge MB-A100/110 firmware Ver. 4.2.0 and earlier, which may allow a remote unauthenticated attacker to execute some critical functions without authentication, e.g., rebooting the p

How urgent is CVE-2023-23906?

Priority 49/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-25072 HIGH 7.5 UPGRADE UPGRADE Use of weak credentials exists in SkyBridge MB-A100/110 firmware Ver
CVE-2023-25070 MEDIUM 6.5 UPGRADE UPGRADE Cleartext transmission of sensitive information exists in SkyBridge MB-A100/110 firmware Ver
CVE-2023-24586 MEDIUM 6.5 UPGRADE UPGRADE Cleartext storage of sensitive information exists in SkyBridge MB-A100/110 firmware Ver
CVE-2023-22361 MEDIUM 6.5 UPGRADE UPGRADE Improper privilege management vulnerability in SkyBridge MB-A100/110 firmware Ver
CVE-2022-36558 CRITICAL 9.8 UPGRADE UPGRADE Seiko SkyBridge MB-A100/A110 v4.2.0 and below implements a hard-coded passcode for the root account

References

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