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

Quick assessment

Affected
Cisco Cisco Secure Endpoint
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cisco Secure Endpoint是美国Cisco公司的一套集成了静态和动态恶意软件分析以及威胁情报于一体的终端应用程序。 Cisco Secure Endpoint存在缓冲区错误漏洞，该漏洞源于扫描ALZ文件时边界检查不当，可能导致越界写入，从而允许未经身份验证的远程攻击者造成拒绝服务条件，或因内存损坏导致其他潜在影响。

CVSS 7.5 · High EPSS 0.57% · P46

Affected Version Matrix 146

VendorProduct Version RangeStatus
Cisco Cisco Secure Endpoint 7.0.5 affected
6.2.19 affected
7.3.3 affected
7.2.13 affected
6.1.5 affected
6.3.1 affected
6.2.5 affected
7.3.5 affected
… +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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Endpoint 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Endpoint是美国Cisco公司的一套集成了静态和动态恶意软件分析以及威胁情报于一体的终端应用程序。 Cisco Secure Endpoint存在缓冲区错误漏洞，该漏洞源于扫描ALZ文件时边界检查不当，可能导致越界写入，从而允许未经身份验证的远程攻击者造成拒绝服务条件，或因内存损坏导致其他潜在影响。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco Cisco 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-2026-20191 7.5 HIGH Cisco Catalyst Center Arbitrary File Read Vulnerability
CVE-2026-20214 7.5 HIGH ClamAV FSG File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-20213 7.5 HIGH ClamAV PE File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-20216 7.5 HIGH ClamAV InstallShield File Format Processing Resource Exhaustion Vulnerability
CVE-2026-20217 7.5 HIGH ClamAV PESpin File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-20215 7.5 HIGH ClamAV 7Zip File Format Processing Out-of-Bounds Memory Corruption Vulnerability
CVE-2026-20244 7.5 HIGH ClamAV DMG File Processing Denial of Service 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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