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CVE-2021-1252— Clam AntiVirus (ClamAV) Excel XLM Parser Denial of Service Vulnerability

Quick assessment

Affected
Cisco ClamAV
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（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 存在输入验证错误漏洞，攻击者可利用该漏洞通过Excel XLM触发过载，从而触发拒绝服务。

CVSS 7.5 · High EPSS 2.52% · P84

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-1252

Vulnerability Information
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Vulnerability Title
Clam AntiVirus (ClamAV) Excel XLM Parser Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in the Excel XLM macro parsing module in Clam AntiVirus (ClamAV) Software versions 0.103.0 and 0.103.1 could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to improper error handling that may result in an infinite loop. An attacker could exploit this vulnerability by sending a crafted Excel file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process hang, resulting in a denial of service condition.
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
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ClamAV 输入验证错误漏洞
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 存在输入验证错误漏洞，攻击者可利用该漏洞通过Excel XLM触发过载，从而触发拒绝服务。
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 ClamAV 0.103.0 -

II. Public POCs for CVE-2021-1252

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III. Intelligence Information for CVE-2021-1252

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Security Blog Posts for CVE-2021-1252 (1)

Same Patch Batch · Cisco · 2021-04-08 · 29 CVEs total

CVE-2021-1459 9.8 CRITICAL Cisco Small Business RV110W, RV130, RV130W, and RV215W Routers Management Interface Remote
CVE-2021-1362 8.8 HIGH Cisco Unified Communications Products Remote Code Execution Vulnerability
CVE-2021-1137 7.8 HIGH Cisco SD-WAN vManage Software Vulnerabilities
CVE-2021-1480 7.8 HIGH Cisco SD-WAN vManage Software Vulnerabilities
CVE-2021-1479 7.8 HIGH Cisco SD-WAN vManage Software Vulnerabilities
CVE-2021-1404 7.5 HIGH Clam AntiVirus (ClamAV) Email Parser Denial of Service Vulnerability
CVE-2021-1405 7.5 HIGH Clam AntiVirus (ClamAV) PDF Parser Denial of Service Vulnerability
CVE-2021-1251 7.4 HIGH Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities
CVE-2021-1308 7.4 HIGH Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities
CVE-2021-1309 7.4 HIGH Cisco Small Business RV Series Routers Link Layer Discovery Protocol Vulnerabilities
CVE-2021-1386 7.0 HIGH Cisco Advanced Malware Protection for Endpoints Windows Connector, ClamAV for Windows, an
CVE-2021-1485 6.6 MEDIUM Cisco IOS XR Software Command Injection Vulnerability
CVE-2021-1475 6.5 MEDIUM Cisco Umbrella Link and CSV Formula Injection Vulnerabilities
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CVE-2021-1413 6.3 MEDIUM Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Authenticated Remote C
CVE-2021-1414 6.3 MEDIUM Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Authenticated Remote C
CVE-2021-1415 6.3 MEDIUM Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers Authenticated Remote C
CVE-2021-1407 6.1 MEDIUM Cisco Unified Communications Products Cross-Site Scripting Vulnerabilities
CVE-2021-1380 6.1 MEDIUM Cisco Unified Communications Products Cross-Site Scripting Vulnerabilities
CVE-2021-1463 6.1 MEDIUM Cisco Unified Intelligence Center Reflected Cross-Site Scripting Vulnerability

Showing top 20 of 29 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: ClamAV
Same vendor: Cisco
Same weakness: CWE-20

V. Comments for CVE-2021-1252

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