// For flags

CVE-2021-1404

Clam AntiVirus (ClamAV) Email Parser Denial of Service Vulnerability

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

A vulnerability in the PDF 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 buffer size tracking that may result in a heap buffer over-read. An attacker could exploit this vulnerability by sending a crafted PDF file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to crash, resulting in a denial of service condition.

Una vulnerabilidad en el módulo de análisis de PDF en el Software Clam AntiVirus (ClamAV) versiones 0.103.0 y 0.103.1, podría permitir a un atacante remoto no autenticado causar una condición de denegación de servicio en un dispositivo afectado. La vulnerabilidad es debido a un seguimiento inapropiado del tamaño del búfer que puede resultar en una lectura excesiva del búfer de la pila. Un atacante podría explotar esta vulnerabilidad mediante el envío de un archivo PDF diseñado a un dispositivo afectado. Una explotación podría permitir al atacante causar que el proceso de escaneo de ClamAV se bloquee, resultando en una condición de denegación de servicio

It was discovered that ClamAV incorrectly handled parsing Excel documents. A remote attacker could possibly use this issue to cause ClamAV to hang, resulting in a denial of service. It was discovered that ClamAV incorrectly handled parsing PDF documents. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. It was discovered that ClamAV incorrectly handled parsing email. A remote attacker could possibly use this issue to cause ClamAV to crash, resulting in a denial of service. Various other issues were also addressed.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2020-11-13 CVE Reserved
  • 2021-04-07 CVE Published
  • 2024-11-08 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-20: Improper Input Validation
  • CWE-125: Out-of-bounds Read
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Clamav
Search vendor "Clamav"
Clamav
Search vendor "Clamav" for product "Clamav"
0.103.0
Search vendor "Clamav" for product "Clamav" and version "0.103.0"
-
Affected
Clamav
Search vendor "Clamav"
Clamav
Search vendor "Clamav" for product "Clamav"
0.103.1
Search vendor "Clamav" for product "Clamav" and version "0.103.1"
-
Affected