How severe is CVE-2018-4003?

CVE-2018-4003 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-4003 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4003?

CVE-2018-4003 affects Getcujo Smart Firewall. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4003?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-4003 published?

CVE-2018-4003 was published on 2019-03-21 and last updated on 2026-06-17.

CVE-2018-4003

CVE-2018-4003 is a critical-severity vulnerability in Getcujo Smart Firewall with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Getcujo Smart Firewall
Published: 2019-03-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-4003?: 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.
How severe is CVE-2018-4003?: CVE-2018-4003 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-4003 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4003?: CVE-2018-4003 affects Getcujo Smart Firewall. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4003?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-4003 published?: CVE-2018-4003 was published on 2019-03-21 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:getcujo:smart_firewall:7003:*:*:*:*:*:*:*

More vulnerabilities in Getcujo Smart Firewall

CVE-2018-4031 — Critical (CVSS 10.0): An exploitable vulnerability exists in the safe browsing function of the CUJO Smart Firewall, version 7003. The flaw…
CVE-2018-3985 — Critical (CVSS 9.8): An exploitable double free vulnerability exists in the mdnscap binary of the CUJO Smart Firewall. When parsing mDNS…
CVE-2018-3963 — High (CVSS 8.0): An exploitable command injection vulnerability exists in the DHCP daemon configuration of the CUJO Smart Firewall. When…
CVE-2018-3969 — High (CVSS 7.8): An exploitable vulnerability exists in the verified boot protection of the CUJO Smart Firewall. It is possible to add…
CVE-2018-4030 — High (CVSS 7.5): An exploitable vulnerability exists the safe browsing function of the CUJO Smart Firewall, version 7003. The bug lies…
CVE-2018-4011 — High (CVSS 7.5): An exploitable integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003.…

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