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
Published Mar 21, 2012
4.3
MEDIUMCVSS 2.0
EPSS 73.67%
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.
Affected products
No data.
- 0.96.4
- 4.61.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 73.67% (0.73671) | 99.46th | v5 (v2026.06.15) |
| Jun 15, 2026 | 73.74% (0.73738) | 99.41th | v5 (v2026.06.15) |
| Feb 20, 2026 | 8.12% (0.08119) | 91.98th | v4 (v2025.03.14) |
| Dec 1, 2025 | 6.14% (0.06139) | 90.49th | v4 (v2025.03.14) |
| Nov 8, 2025 | 18.27% (0.18268) | 94.92th | v4 (v2025.03.14) |
| Sep 20, 2025 | 6.14% (0.06139) | 90.46th | v4 (v2025.03.14) |
| Aug 13, 2025 | 22.34% (0.22339) | 95.57th | v4 (v2025.03.14) |
| Jul 9, 2025 | 53.65% (0.53650) | 97.84th | v4 (v2025.03.14) |
| Jun 3, 2025 | 62.72% (0.62720) | 98.26th | v4 (v2025.03.14) |
| Mar 30, 2025 | 68.02% (0.68024) | 98.48th | v4 (v2025.03.14) |
| Mar 29, 2025 | 70.46% (0.70458) | 98.22th | v4 (v2025.03.14) |
| Mar 17, 2025 | 68.02% (0.68024) | 98.47th | v4 (v2025.03.14) |
| Dec 12, 2024 | 74.83% (0.74835) | 98.26th | v3 (v2023.03.01) |
| Oct 20, 2023 | 74.83% (0.74835) | 97.79th | v3 (v2023.03.01) |
| Mar 7, 2023 | 82.53% (0.82527) | 97.79th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Mar 2, 2023 | 1.41% (0.01408) | 72.88th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.41% (0.01408) | 70.87th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
References (8)
- http://lists.opensuse.org/opensuse-security-announce/2012-07/msg00002.html vendor-advisoryx_refsource_SUSE
- http://osvdb.org/80473 vdb-entryx_refsource_OSVDB
- http://osvdb.org/80474 vdb-entryx_refsource_OSVDB
- http://www.ieee-security.org/TC/SP2012/program.html x_refsource_MISC
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:094 vendor-advisoryx_refsource_MANDRIVA
- http://www.securityfocus.com/archive/1/522005 mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/52611 vdb-entryx_refsource_BID
- https://exchange.xforce.ibmcloud.com/vulnerabilities/74301 vdb-entryx_refsource_XF
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2012-07/msg00002.html | vendor-advisoryx_refsource_SUSE | |
| http://osvdb.org/80473 | vdb-entryx_refsource_OSVDB | |
| http://osvdb.org/80474 | vdb-entryx_refsource_OSVDB | |
| http://www.ieee-security.org/TC/SP2012/program.html | x_refsource_MISC | |
| http://www.mandriva.com/security/advisories?name=MDVSA-2012:094 | vendor-advisoryx_refsource_MANDRIVA | |
| http://www.securityfocus.com/archive/1/522005 | mailing-listx_refsource_BUGTRAQ | |
| http://www.securityfocus.com/bid/52611 | vdb-entryx_refsource_BID | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/74301 | vdb-entryx_refsource_XF |
Change history (0)
No recorded changes yet.