CVE-2021-1534

Description

A vulnerability in the antispam protection mechanisms of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass the URL reputation filters on an affected device. This vulnerability is due to improper processing of URLs. An attacker could exploit this vulnerability by crafting a URL in a particular way. A successful exploit could allow the attacker to bypass the URL reputation filters that are configured for an affected device, which could allow malicious URLs to pass through the device.

Related CPE's

ociscoasyncos********

hciscoemail_security_appliance_c170-*******

hciscoemail_security_appliance_c190-*******

hciscoemail_security_appliance_c380-*******

hciscoemail_security_appliance_c390-*******

hciscoemail_security_appliance_c680-*******

hciscoemail_security_appliance_c690-*******

hciscoemail_security_appliance_c690x-*******

References

20211006 Cisco Email Security Appliance URL Filtering Bypass Vulnerability

Vendor Advisory

CvssV3 impact

BaseSeverity

MEDIUM

ConfidentialityImpact

NONE

AttackComplexity

LOW

Scope

UNCHANGED

AttackVector

NETWORK

AvailabilityImpact

NONE

IntegrityImpact

LOW

PrivilegesRequired

NONE

BaseScore

5.3

VectorString

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Version

3.1

UserInteraction

NONE

CvssV2 impact

AccessComplexity

LOW

ConfidentialityImpact

NONE

AvailabilityImpact

NONE

IntegrityImpact

PARTIAL

BaseScore

5

VectorString

AV:N/AC:L/Au:N/C:N/I:P/A:N

Version

2.0

AccessVector

NETWORK

Authentication

NONE

Created by Yello
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