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CVE-2025-20260— ClamAV PDF Scanning Buffer Overflow Vulnerability

Quick assessment

Affected
Cisco ClamAV
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ClamAV（Clam AntiVirus）是ClamAV团队的一套免费且开源的杀毒软件。该软件用于检测木马、病毒、恶意软件和其他恶意威胁。 ClamAV存在安全漏洞，该漏洞源于PDF文件处理期间内存缓冲区分配不当，可能导致缓冲区溢出。

CVSS 9.8 · Critical EPSS 1.63% · P75
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I. Basic Information for CVE-2025-20260

Vulnerability Information
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Vulnerability Title
ClamAV PDF Scanning Buffer Overflow Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the PDF scanning processes of ClamAV could allow an unauthenticated, remote attacker to cause a buffer overflow condition, cause a denial of service (DoS) condition, or execute arbitrary code on an affected device. This vulnerability exists because memory buffers are allocated incorrectly when PDF files are processed. An attacker could exploit this vulnerability by submitting a crafted PDF file to be scanned by ClamAV on an affected device. A successful exploit could allow the attacker to trigger a buffer overflow, likely resulting in the termination of the ClamAV scanning process and a DoS condition on the affected software. Although unproven, there is also a possibility that an attacker could leverage the buffer overflow to execute arbitrary code with the privileges of the ClamAV process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
ClamAV 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ClamAV（Clam AntiVirus）是ClamAV团队的一套免费且开源的杀毒软件。该软件用于检测木马、病毒、恶意软件和其他恶意威胁。 ClamAV存在安全漏洞，该漏洞源于PDF文件处理期间内存缓冲区分配不当，可能导致缓冲区溢出。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Cisco ClamAV 1.4.2 -

II. Public POCs for CVE-2025-20260

# POC Description Source Link Shenlong Link
1 None https://github.com/keyuraghao/CVE-2025-20260 POC Details
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III. Intelligence Information for CVE-2025-20260

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Same Patch Batch · Cisco · 2025-06-18 · 3 CVEs total

CVE-2025-20271 8.6 HIGH Cisco Meraki MX and Z Series AnyConnect VPN with Client Certificate Authentication Denial
CVE-2025-20234 5.3 MEDIUM ClamAV UDF File Parsing Out-Of-Bounds Read Information Disclosure Vulnerability

IV. Related Vulnerabilities

Same product: ClamAV
Same vendor: Cisco
Same weakness: CWE-122

V. Comments for CVE-2025-20260

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