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Fencer Intel
medium 4.3

CVE-2012-1458 json

The Microsoft CHM file parser in ClamAV 0.96.4 and Sophos Anti-Virus 4.61.0 allows remote attackers to bypass malware detection via a craft…

published 2012-03-21 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-1479

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
72.9%
EPSS 72.9% chance of exploitation in 30 days, percentile 99.4%
public exploits
0
none known

Summary

The Microsoft CHM file parser in ClamAV 0.96.4 and Sophos Anti-Virus 4.61.0 allows remote attackers to bypass malware detection via a crafted reset interval in the LZXC header of a CHM file. NOTE: this may later be SPLIT into multiple CVEs if additional information is published showing that the error occurred independently in different CHM parser implementations.

Patch / fix

  • clamav Debian 14, Debian 13, Debian 12 0.97.5+dfsg-1

debian advisories DEBIAN-CVE-2012-1458

  • clamav openSUSE Tumbleweed 0.99.2-4.1

opensuse advisories openSUSE-SU-2024:10571-1

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-2012-1458 updated cvss 5.0

clamav: specially-crafted CHM files evade detection

  • 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

Exploit prediction

72.85% chance of exploitation in the next 30 days, higher than 99.4% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Intel 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.