CVE-2018-4003

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-03-21 · updated 2026-06-17
Weakness: CWE-787

Description

An exploitable heap overflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall running firmware 7003. The string lengths are handled incorrectly when parsing character strings in mDNS resource records, leading to arbitrary code execution in the context of the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.

Affected products

Getcujo Smart Firewall: 7003

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0672
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0672

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