What’s Vulnerable › Vulnerabilities

CVE-2018-15378: Clam AntiVirus unmew11() Denial of Service Vulnerability

• Severity: medium (CVSS 5.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-10-15 · updated 2026-06-17
• Weakness: CWE-125

Description

A vulnerability in ClamAV versions prior to 0.100.2 could allow an attacker to cause a denial of service (DoS) condition. The vulnerability is due to an error related to the MEW unpacker within the "unmew11()" function (libclamav/mew.c), which can be exploited to trigger an invalid read memory access via a specially crafted EXE file.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04
• Cisco ClamAV: before 0.100.2 — fixed in 0.100.2
• Debian Linux: 8.0

How to fix

Upgrade to a fixed version: Cisco ClamAV 0.100.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.clamav.net/show_bug.cgi?id=12170
• https://lists.debian.org/debian-lts-announce/2018/10/msg00014.html
• https://secuniaresearch.flexerasoftware.com/advisories/83000/
• https://security.gentoo.org/glsa/201904-12
• https://usn.ubuntu.com/3789-1/
• https://usn.ubuntu.com/3789-2/
• https://www.flexera.com/company/secunia-research/advisories/SR-2018-23.html
• https://bugzilla.clamav.net/show_bug.cgi?id=12170
• https://lists.debian.org/debian-lts-announce/2018/10/msg00014.html
• https://secuniaresearch.flexerasoftware.com/advisories/83000/
• https://security.gentoo.org/glsa/201904-12
• https://usn.ubuntu.com/3789-1/

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