CVE-2007-6335

CVE-2007-6335 is a high-severity vulnerability in Clam Anti-virus Clamav with a CVSS 2.0 base score of 7.5. Its EPSS exploit-prediction score of 18% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

• Severity: High (CVSS 2.0 base score 7.5)
• EPSS exploit prediction: 18% (97th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-189
• Affected product: Clam Anti-virus Clamav
• Published: 2007-12-20
• Last modified: 2026-06-16

Description

Integer overflow in libclamav in ClamAV before 0.92 allows remote attackers to execute arbitrary code via a crafted MEW packed PE file, which triggers a heap-based buffer overflow.

Frequently asked questions

What is CVE-2007-6335?

Integer overflow in libclamav in ClamAV before 0.92 allows remote attackers to execute arbitrary code via a crafted MEW packed PE file, which triggers a heap-based buffer overflow.

How severe is CVE-2007-6335?

CVE-2007-6335 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2007-6335 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 18% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2007-6335?

CVE-2007-6335 affects Clam Anti-virus Clamav. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2007-6335?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2007-6335 published?

CVE-2007-6335 was published on 2007-12-20 and last updated on 2026-06-16.

References

• http://docs.info.apple.com/article.html?artnum=307562
• http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=634
• http://lists.apple.com/archives/security-announce/2008/Mar/msg00001.html
• http://lists.opensuse.org/opensuse-security-announce/2008-01/msg00002.html
• http://secunia.com/advisories/28117
• http://secunia.com/advisories/28153
• http://secunia.com/advisories/28176
• http://secunia.com/advisories/28278
• http://secunia.com/advisories/28412
• http://secunia.com/advisories/28421
• http://secunia.com/advisories/28587
• http://secunia.com/advisories/29420
• http://security.gentoo.org/glsa/glsa-200712-20.xml
• http://www.debian.org/security/2007/dsa-1435
• http://www.mandriva.com/security/advisories?name=MDVSA-2008:003
• http://www.securityfocus.com/bid/26927
• http://www.securitytracker.com/id?1019112
• http://www.vupen.com/english/advisories/2007/4253
• http://www.vupen.com/english/advisories/2008/0924/references
• https://exchange.xforce.ibmcloud.com/vulnerabilities/39119
• https://www.exploit-db.com/exploits/4862
• https://www.redhat.com/archives/fedora-package-announce/2008-January/msg00644.html
• https://www.redhat.com/archives/fedora-package-announce/2008-January/msg00740.html

Affected products (1)

• cpe:2.3:a:clam_anti-virus:clamav:*:*:*:*:*:*:*:*

More vulnerabilities in Clam Anti-virus Clamav

• CVE-2008-1100 — Critical (CVSS 10.0): Buffer overflow in the cli_scanpe function in libclamav (libclamav/pe.c) for ClamAV 0.92 and 0.92.1 allows remote…
• CVE-2008-0318 — Critical (CVSS 10.0): Integer overflow in the cli_scanpe function in libclamav in ClamAV before 0.92.1, as used in clamd, allows remote…
• CVE-2007-6337 — Critical (CVSS 10.0): Unspecified vulnerability in the bzip2 decompression algorithm in nsis/bzlib_private.h in ClamAV before 0.92 has…
• CVE-2007-3023 — Critical (CVSS 10.0): unsp.c in ClamAV before 0.90.3 and 0.91 before 0.91rc1 does not properly calculate the end of a certain buffer, with…
• CVE-2005-3587 — Critical (CVSS 10.0): Improper boundary checks in petite.c in Clam AntiVirus (ClamAV) before 0.87.1 allows attackers to perform unknown…
• CVE-2008-5050 — Critical (CVSS 9.3): Off-by-one error in the get_unicode_name function (libclamav/vba_extract.c) in Clam Anti-Virus (ClamAV) before 0.94.1…

All CVEs affecting Clam Anti-virus Clamav →

Other CWE-189 (Numeric Errors) vulnerabilities

• CVE-2015-8396 — Critical (CVSS 10.0): Integer overflow in the ImageRegionReader::ReadIntoBuffer function in…
• CVE-2015-7205 — Critical (CVSS 10.0): Integer underflow in the RTPReceiverVideo::ParseRtpPacket function in Mozilla Firefox before 43.0 and Firefox ESR 38.x…
• CVE-2015-6575 — Critical (CVSS 10.0): SampleTable.cpp in libstagefright in Android before 5.1.1 LMY48I does not properly consider integer promotion, which…
• CVE-2015-3864 — Critical (CVSS 10.0): Integer underflow in the MPEG4Extractor::parseChunk function in MPEG4Extractor.cpp in libstagefright in mediaserver in…
• CVE-2015-3836 — Critical (CVSS 10.0): The Parse_wave function in arm-wt-22k/lib_src/eas_mdls.c in the Sonivox DLS-to-EAS converter in Android before 5.1.1…
• CVE-2015-3834 — Critical (CVSS 10.0): Multiple integer overflows in the BnHDCP::onTransact function in media/libmedia/IHDCP.cpp in libstagefright in Android…

Browse all CWE-189 (Numeric Errors) vulnerabilities →