Is CVE-2017-9438 in the CISA KEV catalog?

No. CVE-2017-9438 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-9438?

CVE-2017-9438 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2017-9438?

CVE-2017-9438 has an EPSS score of 2.57% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-9438?

Upgrade yara on debian 11 to 3.6.1+dfsg-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2017-9438

HIGHEPSS 83th pctl

7.5

CVSS v3

NVD

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.

CWE-674

How to fix

Remediation Available

yaraDebian

Fixed in:3.6.1+dfsg-1CVE-2017-9438

libyara3Ubuntu

Fixed in:3.4.0+dfsg-2ubuntu0.1~esm1USN-8080-1

Fixed in:3.7.1-1ubuntu2+esm1USN-8080-1

Fixed in:3.9.0-1ubuntu0.1~esm1USN-8080-1

python-yaraUbuntu

Fixed in:3.4.0+dfsg-2ubuntu0.1~esm1USN-8080-1

python3-yaraUbuntu

Fixed in:3.4.0+dfsg-2ubuntu0.1~esm1USN-8080-1

yaraUbuntu

Fixed in:3.4.0+dfsg-2ubuntu0.1~esm1USN-8080-1

Fixed in:3.7.1-1ubuntu2+esm1USN-8080-1

Fixed in:3.9.0-1ubuntu0.1~esm1USN-8080-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

2.57%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Patch2

Other references2

Embed a live status badge for CVE-2017-9438

Markdown

[![CVE-2017-9438](https://tridentstack.com/cve/badge/CVE-2017-9438.svg)](https://tridentstack.com/cve/CVE-2017-9438)

HTML

<a href="https://tridentstack.com/cve/CVE-2017-9438"><img src="https://tridentstack.com/cve/badge/CVE-2017-9438.svg" alt="CVE-2017-9438"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.