VulnerabilityModified

CVE-2012-1458

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.

MEDIUM 4.3EPSS 73.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 73.7%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.

Description

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.

CVSS 2.0: 4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:P/A:N
EPSS: 73.67% probability · 99th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-264
Affected: clamav/clamav · sophos/sophos anti-virus
Source: cve@mitre.org

EPSS trend

EPSS 73.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.