What’s Vulnerable › Vulnerabilities

CVE-2017-6094

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2017-12-20 · updated 2026-06-17
• Weakness: CWE-200

Description

CPEs used by subscribers on the access network receive their individual configuration settings from a central GAPS instance. A CPE identifies itself by the MAC address of its WAN interface and a certain "chk" value (48bit) derived from the MAC. The algorithm used to compute the "chk" was disclosed by reverse engineering the CPE's firmware. As a result, it is possible to forge valid "chk" values for any given MAC address and therefore receive the configuration settings of other subscribers' CPEs. The configuration settings often contain sensitive values, for example credentials (username/password) for VoIP services. This issue affects Genexis B.V. GAPS up to 7.2.

Affected products

• Genexis Gaps: before 7.2 — fixed in 7.2

How to fix

Upgrade to a fixed version: Genexis Gaps 7.2. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2017/Dec/62
• http://seclists.org/fulldisclosure/2017/Dec/62

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