TI-2020-02696 Aliases CVE-2020-3134 GHSA-gf7w-86p9-r93x

Cisco Email Security Appliance Zip Decompression Engine Denial of Service Vulnerability

LOW 37CWE-20Published 2020-01-26 · Updated 2024-11-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA.

Summary

A vulnerability in the zip decompression engine of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper validation of zip files. An attacker could exploit this vulnerability by sending an email message with a crafted zip-compressed attachment. A successful exploit could trigger a restart of the content-scanning process, causing a temporary DoS condition. This vulnerability affects Cisco AsyncOS Software for Cisco ESA releases earlier than 13.0.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01087 65th percentileScored 2026-11-07

Fix Fixed Cisco Email Security Appliance (ESA) (Cisco): 13.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Cisco	Cisco Email Security Appliance (ESA)	before 13.0	13.0	Patch available	CNA

Cisco Email Security Appliance (ESA) VendorCisco Affected before 13.0 Fixed in 13.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:email_security_appliance::::::::	before 13.0	Vulnerable	Cisco

cpe:2.3:a:cisco:email_security_appliance:*:*:*:*:*:*:*:* Versions before 13.0 Vulnerable ·Cisco

Remediation

Fix · CNA Cisco Email Security Appliance (ESA) (Cisco) Fixed in 13.0

Timeline

2026-10-02 Threatist record created from CVE-2020-3134
2026-10-03 Alias added: GHSA-gf7w-86p9-r93x

References

Advisory 1

20200122 Cisco Email Security Appliance Zip Decompression Engine Denial of Service Vulnerability

TI-2022-05357 Cisco Email Security Appliance and Cisco Secure Email and Web Manager External Authentication Bypass Vulnerability CVSS 3.1CRITICAL 9.8
TI-2019-01567 Cisco Email Security Appliance Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2018-00378 Improper input validation in Cisco Email Security Appliance CVSS 3.0HIGH 7.5
TI-2020-02695 Cisco Email Security Appliance Content Filter Bypass Vulnerability CVSS 3.1HIGH 7.5
TI-2019-01541 Cisco Email Security Appliance Content Filter Bypass Vulnerability CVSS 3.0HIGH 7.5
TI-2019-01553 Cisco Email Security Appliance Content Filter Bypass Vulnerability CVSS 3.0HIGH 7.4

See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences