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TI-2019-01553 Aliases CVE-2019-1933GHSA-wh6w-g2c8-6w6p

Cisco Email Security Appliance Content Filter Bypass Vulnerability

Priority MEDIUM 41CWE-20Published · Updated

Key facts

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

Attack profile from CVSS 3.0 · 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 input validation of certain email fields. 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 configured message filters and inject arbitrary scripting code inside the email body. The malicious code is not executed by default unless the recipient's email client is configured to execute scripts contained in emails.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0124 69th 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

VendorProductAffected versionsFixed inStatusSource
CiscoCisco Email Security Appliance (ESA)11.1.2-023—No fix listedCNA
  • Cisco Email Security Appliance (ESA) VendorCisco Affected 11.1.2-023 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cisco:email_security_appliance:11.1.2-023:*:*:*:*:*:*:*11.1.2-023VulnerableCisco
  • cpe:2.3:a:cisco:email_security_appliance:11.1.2-023:*:*:*:*:*:*:* Versions 11.1.2-023 Vulnerable ·Cisco

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2019-1933
  2. 2026-10-03 Alias added: GHSA-wh6w-g2c8-6w6p

References

Advisory 1

  • 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-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