What’s Vulnerable › Vulnerabilities

CVE-2017-16778

• Severity: medium (CVSS 4.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-12-24 · updated 2026-06-17
• Weakness: CWE-863

Description

An access control weakness in the DTMF tone receiver of Fermax Outdoor Panel allows physical attackers to inject a Dual-Tone-Multi-Frequency (DTMF) tone to invoke an access grant that would allow physical access to a restricted floor/level. By design, only a residential unit owner may allow such an access grant. However, due to incorrect access control, an attacker could inject it via the speaker unit to perform an access grant to gain unauthorized access, as demonstrated by a loud DTMF tone representing '1' and a long '#' (697 Hz and 1209 Hz, followed by 941 Hz and 1477 Hz).

Affected products

• Fermax Outdoor Panel Firmware: all versions

References

• https://github.com/breaktoprotect/CVE-2017-16778-Intercom-DTMF-Injection
• https://github.com/breaktoprotect/CVE-2017-16778-Intercom-DTMF-Injection

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