TI-2019-01508 Aliases CVE-2019-1886 GHSA-8ggj-222w-8pp7

Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability

MEDIUM 46CWE-20Published 2019-07-04 · Updated 2024-11-19

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-295.

Summary

A vulnerability in the HTTPS decryption feature of Cisco Web Security Appliance (WSA) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerability is due to insufficient validation of Secure Sockets Layer (SSL) server certificates. An attacker could exploit this vulnerability by installing a malformed certificate in a web server and sending a request to it through the Cisco WSA. A successful exploit could allow the attacker to cause an unexpected restart of the proxy process on an affected device.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01347 71st percentileScored 2026-11-07

Fix Fixed Cisco Web Security Appliance (WSA) (Cisco): 10.5.5-005

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 Web Security Appliance (WSA)	before 10.5.5-005	10.5.5-005	Patch available	CNA

Cisco Web Security Appliance (WSA) VendorCisco Affected before 10.5.5-005 Fixed in 10.5.5-005 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:o:cisco:asyncos::::::::	10.5 to before 10.5.5-005; 11.5 to before 11.5.2-020	Vulnerable	Cisco
cpe:2.3:a:cisco:web_security_appliance:10.5.2-072:::::::*	10.5.2-072	Vulnerable	Cisco
cpe:2.3:a:cisco:web_security_appliance:10.5.3-025:::::::*	10.5.3-025	Vulnerable	Cisco
cpe:2.3:a:cisco:web_security_appliance:11.7.0-fcs-334:::::::*	11.7.0-fcs-334	Vulnerable	Cisco

cpe:2.3:o:cisco:asyncos:*:*:*:*:*:*:*:* Versions 10.5 to before 10.5.5-005; 11.5 to before 11.5.2-020 Vulnerable ·Cisco
cpe:2.3:a:cisco:web_security_appliance:10.5.2-072:*:*:*:*:*:*:* Versions 10.5.2-072 Vulnerable ·Cisco
cpe:2.3:a:cisco:web_security_appliance:10.5.3-025:*:*:*:*:*:*:* Versions 10.5.3-025 Vulnerable ·Cisco
cpe:2.3:a:cisco:web_security_appliance:11.7.0-fcs-334:*:*:*:*:*:*:* Versions 11.7.0-fcs-334 Vulnerable ·Cisco

Remediation

Fix · CNA Cisco Web Security Appliance (WSA) (Cisco) Fixed in 10.5.5-005

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2019-07-04
Cisco Web Security Appliance (WSA) 10.5.5-005
2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2019-01506 Cisco Web Security Appliance Web Proxy Denial of Service VulnerabilityPriority LOW 37
Show all 2 records →

Timeline

2026-10-02 Threatist record created from CVE-2019-1886
2026-10-03 Alias added: GHSA-8ggj-222w-8pp7

References

Advisory 1

20190703 Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability

TI-2026-74174 Arbitrary file write in Cisco Secure Email Gateway via AMP feature KEVCVSS 3.1CRITICAL 9.8
TI-2026-53489 Cisco Secure Email Gateway SQL Injection Vulnerability KEVCVSS 3.1CRITICAL 9.8
TI-2025-14683 Cisco Secure Email Gateway and Cisco Secure Email and Web Manager Remote Command Execution Vulnerability KEVCVSS 3.1CRITICAL 10.0
TI-2021-13698 Cisco Web Security Appliance Proxy Service Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2018-11020 Cisco Email Security Appliance URL Filtering Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2019-01567 Cisco Email Security Appliance Denial of Service Vulnerability CVSS 3.1HIGH 8.6

See all 55 →

Sources

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