How severe is CVE-2019-12175?

CVE-2019-12175 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-2019-12175 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-2019-12175?

CVE-2019-12175 affects Zeek. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-12175?

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-2019-12175 published?

CVE-2019-12175 was published on 2019-07-17 and last updated on 2026-06-17.

CVE-2019-12175

CVE-2019-12175 is a high-severity vulnerability in Zeek 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-476.

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-476
Affected product: Zeek
Published: 2019-07-17
Last modified: 2026-06-17

Description

In Zeek Network Security Monitor (formerly known as Bro) before 2.6.2, a NULL pointer dereference in the Kerberos (aka KRB) protocol parser leads to DoS because a case-type index is mishandled.

Frequently asked questions

What is CVE-2019-12175?: In Zeek Network Security Monitor (formerly known as Bro) before 2.6.2, a NULL pointer dereference in the Kerberos (aka KRB) protocol parser leads to DoS because a case-type index is mishandled.
How severe is CVE-2019-12175?: CVE-2019-12175 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-2019-12175 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-2019-12175?: CVE-2019-12175 affects Zeek. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-12175?: 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-2019-12175 published?: CVE-2019-12175 was published on 2019-07-17 and last updated on 2026-06-17.

References

https://github.com/zeek/zeek/releases/tag/v2.6.2

Affected products (1)

cpe:2.3:a:zeek:zeek:*:*:*:*:*:*:*:*

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