How severe is CVE-2018-17019?

CVE-2018-17019 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-2018-17019 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-17019?

CVE-2018-17019 affects Bro. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-17019?

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-2018-17019 published?

CVE-2018-17019 was published on 2018-09-13 and last updated on 2026-06-17.

CVE-2018-17019

CVE-2018-17019 is a high-severity vulnerability in Bro 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Bro
Published: 2018-09-13
Last modified: 2026-06-17

Description

In Bro through 2.5.5, there is a DoS in IRC protocol names command parsing in analyzer/protocol/irc/IRC.cc.

Frequently asked questions

What is CVE-2018-17019?: In Bro through 2.5.5, there is a DoS in IRC protocol names command parsing in analyzer/protocol/irc/IRC.cc.
How severe is CVE-2018-17019?: CVE-2018-17019 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-2018-17019 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-17019?: CVE-2018-17019 affects Bro. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-17019?: 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-2018-17019 published?: CVE-2018-17019 was published on 2018-09-13 and last updated on 2026-06-17.

References

https://github.com/bro/bro/commit/c2b18849f8bb833253538f5dfedb4ed1dc176a30

Affected products (1)

cpe:2.3:a:bro:bro:*:*:*:*:*:*:*:*

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