CVE-2020-26082

MEDIUM

5.3

CVSS Score

Published: August 4, 2023 at 08:49 PM UTC

Updated: June 17, 2026 at 03:07 AM UTC

9 products affected across 1 vendorAsyncosEmail Security Appliance C680Email Security Appliance C170

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass content filters that are configured on an affected device. The vulnerability is due to improper handling of password-protected zip files. An attacker could exploit this vulnerability by sending a malicious file inside a crafted zip-compressed file to an affected device. A successful exploit could allow the attacker to bypass configured content filters that would normally drop the email.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Asyncos · Cisco

95%

v < 13.5.2

Affected range stops below 13.5.2, so it looks safe — our inference, not a vendor statement

cisco-email-security-appliance-c170 (environment) · cisco-email-security-appliance-c190 (environment) · cisco-email-security-appliance-c380 (environment) · cisco-email-security-appliance-c390 (environment) · cisco-email-security-appliance-c680 (environment) · cisco-email-security-appliance-c690 (environment) · cisco-email-security-appliance-c690x (environment)

Email Security Appliance · Cisco

60%

All versions

Email Security Appliance C170 · Ciscodevice

80%

All versions

Email Security Appliance C190 · Ciscodevice

80%

All versions

Email Security Appliance C380 · Ciscodevice

80%

All versions