CVE-2014-8657: The Compal Broadband Networks (CBN) CH6640E and CG6640E Wireless Gateway 1.0 with firmware CH6640-3.5.11.7-NOS

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MEDIUM 5.0DOWNGRADEMITIGATEMITIGATE

CVE-2014-8657 is a medium-severity flaw (CVSS 5.0) affecting firmware, cg6640e wireless gateway, ch664oe wireless gateway. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Compal Broadband Networks (CBN) CH6640E and CG6640E Wireless Gateway 1.0 with firmware CH6640-3.5.11.7-NOSH allows remote attackers to cause a denial of service (disconnect all wifi clients) via a request to wirelessChannelStatus.html.

Why this priority

EPSS top 6%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	6.8% (top 6%)
CISA exploited list	No
Weakness	CWE-16
Published	2014-11-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: compal broadband networks

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

Am I affected?

Timeline

2014-11-06 15:55 UTCPublished CVE record published
2026-06-17 00:17 UTCUpdated Record last modified

compal broadband networks firmware DOWNGRADE

Affected: ch6640-3.5.11.7-nosh

Fixed in: no fixed release known

Safe to downgrade to: a release before ch6640-3.5.11.7-nosh

1. Check installed version

apt-cache policy firmware || rpm -q firmware || firmware --version

2. No fixed release: DOWNGRADE to a release before ch6640-3.5.11.7-nosh (Debian / Ubuntu)

apt-cache madison firmware sudo apt install firmware=<VERSION_BEFORE_ch6640-3.5.11.7-nosh> sudo apt-mark hold firmware

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list firmware sudo dnf downgrade firmware-<VERSION_BEFORE_ch6640-3.5.11.7-nosh> sudo dnf versionlock add firmware

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

compal broadband networks cg6640e wireless gateway MITIGATE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

compal broadband networks ch664oe wireless gateway MITIGATE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: CBN CH6640E/CG6640E Wireless Gateway Series - Multiple Vulnerabilities

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-2014-8657?

firmware: downgrade or apply the listed mitigation; cg6640e wireless gateway: mitigate or apply the listed mitigation; ch664oe wireless gateway: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2014-8657 being exploited?

CVE-2014-8657 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-2014-8657 affect?

CVE-2014-8657 affects firmware, cg6640e wireless gateway, ch664oe wireless gateway. Severity is medium (CVSS 5.0). The Compal Broadband Networks (CBN) CH6640E and CG6640E Wireless Gateway 1.0 with firmware CH6640-3.5.11.7-NOSH allows remote attackers to cause a denial of service (disconnect all wifi clients) via a request to wirelessChannelStatus.html.

How urgent is CVE-2014-8657?

Priority 46/100. EPSS top 6%: very likely to be exploited; Public exploit reference

Software pages

Wi-Fi vulnerabilities

Related CVEs

CVE-2016-6257 MEDIUM 6.5 MITIGATE UPGRADE The firmware in Lenovo Ultraslim dongles, as used with Lenovo Liteon SK-8861, Ultraslim Wireless, and Silver S
CVE-2014-8656 HIGH 10.0 DOWNGRADE MITIGATE The Compal Broadband Networks (CBN) CH6640E and CG6640E Wireless Gateway 1.0 with firmware CH6640-3.5.11.7-NOS
CVE-2014-8655 MEDIUM 5.0 DOWNGRADE MITIGATE The Compal Broadband Networks (CBN) CH6640E and CG6640E Wireless Gateway 1.0 with firmware CH6640-3.5.11.7-NOS
CVE-2014-8654 MEDIUM 6.8 DOWNGRADE MITIGATE Multiple cross-site request forgery (CSRF) vulnerabilities in Compal Broadband Networks (CBN) CH6640E and CG66
CVE-2014-8653 MEDIUM 4.3 MITIGATE MITIGATE Cross-site scripting (XSS) vulnerability in Compal Broadband Networks (CBN) CH6640E and CG6640E Wireless Gatew

References

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