How severe is CVE-2018-4011?

CVE-2018-4011 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-4011 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-4011?

CVE-2018-4011 affects Getcujo Smart Firewall. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-4011?

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

When was CVE-2018-4011 published?

CVE-2018-4011 was published on 2019-03-21 and last updated on 2026-06-17.

CVE-2018-4011

CVE-2018-4011 is a high-severity vulnerability in Getcujo Smart Firewall with a CVSS 3.x base score of 7.5. 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-191.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (67th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-191
Affected product: Getcujo Smart Firewall
Published: 2019-03-21
Last modified: 2026-06-17

Description

An exploitable integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003. When parsing SRV records in an mDNS packet, the "RDLENGTH" value is handled incorrectly, leading to an out-of-bounds access that crashes the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.

Frequently asked questions

What is CVE-2018-4011?: An exploitable integer underflow vulnerability exists in the mdnscap binary of the CUJO Smart Firewall, version 7003. When parsing SRV records in an mDNS packet, the "RDLENGTH" value is handled incorrectly, leading to an out-of-bounds access that crashes the mdnscap process. An unauthenticated attacker can send an mDNS message to trigger this vulnerability.
How severe is CVE-2018-4011?: CVE-2018-4011 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-4011 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (67th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-4011?: CVE-2018-4011 affects Getcujo Smart Firewall. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-4011?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-4011 published?: CVE-2018-4011 was published on 2019-03-21 and last updated on 2026-06-17.

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0681

Affected products (1)

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

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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…
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