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CVE-2026-20338— ClamAV ZIP File Format Processing Memory Corruption 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公司的一款终端安全与反病毒防护软件。 Cisco Secure Endpoint存在资源管理错误漏洞，该漏洞源于处理zip文件内容时内存处理不当，可能导致未经身份验证的远程攻击者提交特制zip文件，造成ClamAV扫描进程因双重释放而终止，导致拒绝服务。

CVSS 7.5 · High EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

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-2026-20338

Vulnerability Information
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Vulnerability Title
ClamAV ZIP File Format Processing Memory Corruption Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, 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
双重释放
Source: CVE Program / CVE List V5
Vulnerability Title
Cisco Secure Endpoint 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cisco Secure Endpoint是美国Cisco公司的一款终端安全与反病毒防护软件。 Cisco Secure Endpoint存在资源管理错误漏洞，该漏洞源于处理zip文件内容时内存处理不当，可能导致未经身份验证的远程攻击者提交特制zip文件，造成ClamAV扫描进程因双重释放而终止，导致拒绝服务。
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-2026-20338

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III. Intelligence Information for CVE-2026-20338

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Vendor Advisories for CVE-2026-20338 (1)

Same Patch Batch · Cisco · 2026-08-07 · 7 CVEs total

CVE-2026-20348 7.5 HIGH ClamAV XAR File Format Processing Memory Corruption Vulnerability
CVE-2026-20345 7.5 HIGH ClamAV GPT File Format Processing Memory Corruption Vulnerability
CVE-2026-20339 7.5 HIGH ClamAV PESpin File Format Processing Integer Overflow Vulnerability
CVE-2026-20347 7.5 HIGH ClamAV Mach-O File Format Processing Memory Corruption Vulnerability
CVE-2026-20346 7.5 HIGH ClamAV PDF File Format Processing Memory Corruption Vulnerability
CVE-2026-20337 7.5 HIGH ClamAV ZIP File Format Processing Memory Corruption Vulnerability

IV. Related Vulnerabilities

Same product: Cisco Secure Endpoint
Same vendor: Cisco
Same weakness: CWE-415

V. Comments for CVE-2026-20338

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