How severe is CVE-2019-19999?

CVE-2019-19999 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-19999 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-19999?

CVE-2019-19999 primarily affects Halo. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-19999?

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-2019-19999 published?

CVE-2019-19999 was published on 2019-12-26 and last updated on 2026-06-17.

CVE-2019-19999

CVE-2019-19999 is a high-severity vulnerability in Halo with a CVSS 3.x base score of 7.2. 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-918.

Key facts

Severity: High (CVSS 3.x base score 7.2)
CVSS v2: 6.5
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Halo
Published: 2019-12-26
Last modified: 2026-06-17

Description

Halo before 1.2.0-beta.1 allows Server Side Template Injection (SSTI) because TemplateClassResolver.SAFER_RESOLVER is not used in the FreeMarker configuration.

Frequently asked questions

What is CVE-2019-19999?: Halo before 1.2.0-beta.1 allows Server Side Template Injection (SSTI) because TemplateClassResolver.SAFER_RESOLVER is not used in the FreeMarker configuration.
How severe is CVE-2019-19999?: CVE-2019-19999 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-19999 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-19999?: CVE-2019-19999 primarily affects Halo. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-19999?: 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-2019-19999 published?: CVE-2019-19999 was published on 2019-12-26 and last updated on 2026-06-17.

References

Affected products (4)

cpe:2.3:a:halo:halo:*:*:*:*:*:*:*:*
cpe:2.3:a:halo:halo:1.1.3:beta1:*:*:*:*:*:*
cpe:2.3:a:halo:halo:1.1.3:beta2:*:*:*:*:*:*
cpe:2.3:a:halo:halo:1.2.0:beta1:*:*:*:*:*:*

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