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CVE-2026-20345— ClamAV GPT 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.

ClamAV是ClamAV组织开源的一套杀毒软件。该软件用于检测木马、病毒、恶意软件和其他恶意威胁。 ClamAV 存在缓冲区错误漏洞，该漏洞源于GPT文件格式解析器对端序转换操作的不当处理，可能导致越界写入，攻击者可通过提交特制的GPT文件导致ClamAV扫描进程终止，造成拒绝服务。

CVSS 7.5 · High EPSS 0.46% · P38

Affected Version Matrix 29

VendorProduct Version RangeStatus
Cisco Cisco Secure Endpoint 1.12.3 affected
1.8.0 affected
1.11.1 affected
1.12.4 affected
1.10.0 affected
1.12.0 affected
1.8.1 affected
1.10.1 affected
… +21 more rows
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I. Basic Information for CVE-2026-20345

Vulnerability Information
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Vulnerability Title
ClamAV GPT File Format Processing Memory Corruption Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the GPT 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 handling of an endian conversion operation, which may result in an out-of-bounds buffer write. An attacker could exploit this vulnerability by submitting a crafted GPT 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
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
ClamAV 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ClamAV是ClamAV组织开源的一套杀毒软件。该软件用于检测木马、病毒、恶意软件和其他恶意威胁。 ClamAV 存在缓冲区错误漏洞，该漏洞源于GPT文件格式解析器对端序转换操作的不当处理，可能导致越界写入，攻击者可通过提交特制的GPT文件导致ClamAV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 1.12.3 -

II. Public POCs for CVE-2026-20345

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III. Intelligence Information for CVE-2026-20345

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Vendor Advisories for CVE-2026-20345 (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-2026-20339 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-2026-20338 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-121

V. Comments for CVE-2026-20345

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