Cisco Email Security Appliance Zip Content Filter Bypass (cisco-sa-esa-zip-bypass-gbU4gtTg)

medium Nessus Plugin ID 149847
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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 vulnerability in the zip decompression engine due to improper handling of password-protected zip files. An unauthenticated, remote attacker can exploit this with a crafted zip file to bypass content filters.

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

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvv38679

See Also

Plugin Details

Severity: Medium

ID: 149847

File Name: cisco-sa-esa-zip-bypass-gbU4gtTg.nasl

Version: 1.5

Type: combined

Family: CISCO

Published: 5/21/2021

Updated: 6/3/2021

Dependencies: cisco_esa_version.nasl

Risk Information

CVSS Score Source: CVE-2020-26082


Risk Factor: Low

Score: 2


Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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


Risk Factor: Medium

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: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:email_security_appliance

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

Exploit Ease: No known exploits are available

Patch Publication Date: 11/4/2020

Vulnerability Publication Date: 11/4/2020

Reference Information

CVE: CVE-2020-26082


CISCO-SA: cisco-sa-esa-zip-bypass-gbU4gtTg

IAVA: 2020-A-0447-S

CWE: 20