How severe is CVE-2017-9438?

CVE-2017-9438 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-2017-9438 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-9438?

CVE-2017-9438 affects Virustotal Yara. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-9438?

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-2017-9438 published?

CVE-2017-9438 was published on 2017-06-05 and last updated on 2026-06-17.

CVE-2017-9438

CVE-2017-9438 is a high-severity vulnerability in Virustotal Yara 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-674.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-674
Affected product: Virustotal Yara
Published: 2017-06-05
Last modified: 2026-06-17

Description

libyara/re.c in the regexp module in YARA 3.5.0 allows remote attackers to cause a denial of service (stack consumption) via a crafted rule (involving hex strings) that is mishandled in the _yr_re_emit function, a different vulnerability than CVE-2017-9304.

Frequently asked questions

What is CVE-2017-9438?: libyara/re.c in the regexp module in YARA 3.5.0 allows remote attackers to cause a denial of service (stack consumption) via a crafted rule (involving hex strings) that is mishandled in the _yr_re_emit function, a different vulnerability than CVE-2017-9304.
How severe is CVE-2017-9438?: CVE-2017-9438 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-2017-9438 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-9438?: CVE-2017-9438 affects Virustotal Yara. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-9438?: 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-2017-9438 published?: CVE-2017-9438 was published on 2017-06-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:virustotal:yara:3.5.0:*:*:*:*:*:*:*

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