TI-2020-02695 Aliases CVE-2020-3133 GHSA-g479-6ppw-v22h

Cisco Email Security Appliance Content Filter Bypass Vulnerability

MEDIUM 42CWE-20Published 2020-09-23 · Updated 2024-11-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · None
Fix status: No fix listed

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

Summary

A vulnerability in the email message scanning of Cisco AsyncOS Software for Cisco Email Security Appliance (ESA) could allow an unauthenticated, remote attacker to bypass configured filters on the device. The vulnerability is due to improper validation of incoming emails. An attacker could exploit this vulnerability by sending a crafted email message to a recipient protected by the ESA. A successful exploit could allow the attacker to bypass the configured content filters, which could allow malicious content to pass through the device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01378 72nd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

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)	all versions	—	No fix listed	CNA

Cisco Email Security Appliance (ESA) VendorCisco Affected all versions Fixed in — No fix listed 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

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-3133
2026-10-03 Alias added: GHSA-g479-6ppw-v22h

References

Advisory 1

20200122 Cisco Email Security Appliance Content Filter Bypass 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-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
TI-2020-03092 Cisco Email Security Appliance Denial Of Service Vulnerability CVSS 3.1HIGH 7.5

See all 49 →

Sources

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