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Fencer Vulns
medium 5.5

CVE-2018-15378 json

Clam AntiVirus unmew11() Denial of Service Vulnerability

published 2018-10-15 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-7256

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

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.

Patch / fix

  • Cisco ClamAV 0.100.2
  • clamav Debian 14, Debian 13, Debian 12 0.100.2+dfsg-1

debian advisories DEBIAN-CVE-2018-15378

  • clamav Ubuntu 14.04 LTS 0.100.2+dfsg-1ubuntu0.14.04.1
  • clamav Ubuntu 16.04 LTS 0.100.2+dfsg-1ubuntu0.16.04.1
  • clamav Ubuntu 18.04 LTS 0.100.2+dfsg-1ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-15378

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • clamav SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +8 more 0.100.2-33.18.1
  • clamav SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +2 more 0.100.2-0.20.18.1
  • clamav SLE Module for Basesystem 15 0.100.2-3.6.4

suse advisories SUSE-SU-2018:3436-2SUSE-SU-2018:3441-1SUSE-SU-2018:3436-1SUSE-SU-2018:3250-1

  • clamav openSUSE Tumbleweed 0.103.3-1.4

opensuse advisories openSUSE-SU-2024:10685-1

  • clamav Alpine 3.24, Alpine 3.23, Alpine 3.22 +16 more 0.100.2-r0

alpine advisories ALPINE-CVE-2018-15378

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-15378 updated cvss 5.3

clamav: denial-of-service in MEW unpacking feature

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
23 mo ago

Exploit prediction

1.31% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • Cisco ClamAV

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.