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CVE-2026-20347— ClamAV Mach-O 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 1.1.0版本至8.4.5.30483版本存在缓冲区错误漏洞，该漏洞源于ClamAV的Mach-O文件格式解析器边界检查不当，可能导致越界读取，攻击者可通过提交特制的Mach-O文件利用该漏洞，导致扫描进程终止，造成拒绝服务。

CVSS 7.5 · High EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 162

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
… +154 more rows
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I. Basic Information for CVE-2026-20347

Vulnerability Information
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Vulnerability Title
ClamAV Mach-O File Format Processing Memory Corruption Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Mach-O file format parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition or possibly other expanded impacts as a result of memory corruption on an affected device. This vulnerability is due to improper boundary checks for content in Mach-O files during scanning, which may result in an out-of-bounds buffer read. An attacker could exploit this vulnerability by submitting a crafted Mach-O file 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
跨界内存读
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公司的一款终端安全与反病毒防护软件。 Cisco Secure Endpoint 1.1.0版本至8.4.5.30483版本存在缓冲区错误漏洞，该漏洞源于ClamAV的Mach-O文件格式解析器边界检查不当，可能导致越界读取，攻击者可通过提交特制的Mach-O文件利用该漏洞，导致扫描进程终止，造成拒绝服务。
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-2026-20347

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III. Intelligence Information for CVE-2026-20347

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Vendor Advisories for CVE-2026-20347 (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-2026-20346 7.5 HIGH ClamAV PDF File Format Processing Memory Corruption Vulnerability
CVE-2026-20338 7.5 HIGH ClamAV ZIP 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-125

V. Comments for CVE-2026-20347

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