Cisco Email Security Appliance URL Filtering Bypass (cisco-sa-esa-url-bypass-zZtugtg3)

Medium Nessus Plugin ID 141352

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VPR Score: 1.6


The remote device is missing a vendor-supplied security patch.


According to its self-reported version, Cisco Email Security Appliance (ESA) is affected by a URL filtering bypass vulnerability in Cisco AsyncOS Software. An unauthenticated, remote attacker can exploit this, by crafting a URL in a particular way, to bypass URL reputation filters and allow malicious URLs to pass through the device.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.


Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCvu50941 and CSCvu53078.

See Also

Plugin Details

Severity: Medium

ID: 141352

File Name: cisco-sa-esa-url-bypass-zZtugtg3.nasl

Version: 1.4

Type: combined

Family: CISCO

Published: 2020/10/09

Updated: 2020/10/13

Dependencies: 69075

Risk Information

Risk Factor: Medium

VPR Score: 1.6

CVSS Score Source: CVE-2020-3568

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 5.8

Temporal Score: 5.1

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:email_security_appliance_(esa)

Required KB Items: Host/AsyncOS/Cisco Email Security Appliance/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 2020/10/07

Vulnerability Publication Date: 2020/10/07

Reference Information

CVE: CVE-2020-3568

CISCO-BUG-ID: CSCvu50941, CSCvu53078

CISCO-SA: cisco-sa-esa-url-bypass-zZtugtg3

IAVA: 2020-A-0447