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CVE-2026-20243— ClamAV ALZ Archive Processing Denial of Service Vulnerability

CVSS 7.5 · High EPSS 0.39% · P31

Affected Version Matrix 146

VendorProductVersion RangeStatus
CiscoCisco Secure Endpoint7.0.5affected
6.2.19affected
7.3.3affected
7.2.13affected
6.1.5affected
6.3.1affected
6.2.5affected
7.3.5affected
… +138 more rows
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I. Basic Information for CVE-2026-20243

Vulnerability Information
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Vulnerability Title
ClamAV ALZ Archive Processing Denial of Service Vulnerability
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability in the ALZ file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition, or possibly other expanded impacts, resulting from memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in ALZ files during scanning, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted file that contains ALZ content to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate, resulting in a DoS condition on the affected software.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
CiscoCisco Secure Endpoint 7.0.5 -

II. Public POCs for CVE-2026-20243

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III. Intelligence Information for CVE-2026-20243

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Vendor Advisories for CVE-2026-20243 (1)

Same Patch Batch · Cisco · 2026-07-01 · 8 CVEs total

CVE-2026-202447.5 HIGHClamAV DMG File Processing Denial of Service Vulnerability
CVE-2026-202157.5 HIGHClamAV 7Zip File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-202177.5 HIGHClamAV PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-202167.5 HIGHClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability
CVE-2026-202137.5 HIGHClamAV PE File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-202147.5 HIGHClamAV FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-201917.5 HIGHCisco Catalyst Center Arbitrary File Read Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Secure Endpoint
Same vendor: Cisco
Same weakness: CWE-120

V. Comments for CVE-2026-20243

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