Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-34741

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
04/11/2021
Last modified:
07/11/2023

Description

A vulnerability in the email scanning algorithm of Cisco AsyncOS software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to perform a denial of service (DoS) attack against an affected device. This vulnerability is due to insufficient input validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email through Cisco ESA. A successful exploit could allow the attacker to exhaust all the available CPU resources on an affected device for an extended period of time, preventing other emails from being processed and resulting in a DoS condition.

Impact

Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH
Vector 2.0
AV:N/AC:L/Au:N/C:N/I:N/A:P CVSS v2.0 Severity and Metrics:

Base Score: 5.00 MEDIUM
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Attack Vector (AV): Network
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): None
Integrity (I): None
Availability (A): Physical

Base Score 2.0
5.00
Severity 2.0
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* 13.0.4 (excluding)
cpe:2.3:o:cisco:asyncos:13.5.3-010:*:*:*:*:*:*:*
cpe:2.3:o:cisco:asyncos:13.7.0-093:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m170:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m190:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m380:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m390:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m390x:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m680:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m690:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:m690x:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:s195:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:s395:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:s695:-:*:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools