Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-34698

Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
06/10/2021
Last modified:
07/11/2023

Description

A vulnerability in the proxy service of Cisco AsyncOS for Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to exhaust system memory and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management in the proxy service of an affected device. An attacker could exploit this vulnerability by establishing a large number of HTTPS connections to the affected device. A successful exploit could allow the attacker to cause the system to stop processing new connections, which could result in a DoS condition. Note: Manual intervention may be required to recover from this situation.

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:C CVSS v2.0 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

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

Base Score 2.0
7.80
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* 12.0 (including) 12.0.3-005 (excluding)
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* 12.5 (including) 12.5.2-007 (excluding)
cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* 14.0 (including) 14.0.1-014 (excluding)
cpe:2.3:h:cisco:web_security_appliance_s170:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:web_security_appliance_s190:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:web_security_appliance_s380:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:web_security_appliance_s390:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:web_security_appliance_s680:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:web_security_appliance_s690:-:*:*:*:*:*:*:*
cpe:2.3:h:cisco:web_security_appliance_s690x:-:*:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools