How severe is CVE-2018-19974?

CVE-2018-19974 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2018-19974 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-19974?

CVE-2018-19974 affects Virustotal Yara. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-19974?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-19974 published?

CVE-2018-19974 was published on 2018-12-17 and last updated on 2026-06-17.

CVE-2018-19974

CVE-2018-19974 is a medium-severity vulnerability in Virustotal Yara with a CVSS 3.x base score of 5.5. 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-908.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (66th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-908
Affected product: Virustotal Yara
Published: 2018-12-17
Last modified: 2026-06-17

Description

In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).

Frequently asked questions

What is CVE-2018-19974?: In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).
How severe is CVE-2018-19974?: CVE-2018-19974 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2018-19974 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (66th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-19974?: CVE-2018-19974 affects Virustotal Yara. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-19974?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-19974 published?: CVE-2018-19974 was published on 2018-12-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:virustotal:yara:3.8.1:*:*:*:*:*:*:*

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