TI-2019-01440 Aliases CVE-2019-1817 GHSA-7577-f2mx-w9rc

Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability

MEDIUM 42CWE-20Published 2019-05-03 · Updated 2024-11-19

Key facts

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

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

Summary

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance 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 HTTP and HTTPS requests. An attacker could exploit this vulnerability by sending a malformed HTTP or HTTPS request to an affected device. An exploit could allow the attacker to cause a restart of the web proxy process, resulting in a temporary DoS condition.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01772 78th percentileScored 2026-11-07

Fix Fixed Cisco Web Security Appliance (WSA) (Cisco): 11.5.2-020, 11.7.0-406

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 11.5.2-020; before 11.7.0-406	11.5.2-020, 11.7.0-406	Patch available	CNA

Cisco Web Security Appliance (WSA) VendorCisco Affected before 11.5.2-020; before 11.7.0-406 Fixed in 11.5.2-020, 11.7.0-406 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:cisco:web_security_appliance:11.5.1-fcs-115:::::::*	11.5.1-fcs-115	Vulnerable	Cisco
cpe:2.3:a:cisco:web_security_appliance:11.5.1-fcs-124:::::::*	11.5.1-fcs-124	Vulnerable	Cisco
cpe:2.3:a:cisco:web_security_appliance:11.5.1-fcs-125:::::::*	11.5.1-fcs-125	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:a:cisco:web_security_appliance:11.5.1-fcs-115:*:*:*:*:*:*:* Versions 11.5.1-fcs-115 Vulnerable ·Cisco
cpe:2.3:a:cisco:web_security_appliance:11.5.1-fcs-124:*:*:*:*:*:*:* Versions 11.5.1-fcs-124 Vulnerable ·Cisco
cpe:2.3:a:cisco:web_security_appliance:11.5.1-fcs-125:*:*:*:*:*:*:* Versions 11.5.1-fcs-125 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 11.5.2-020, 11.7.0-406

Timeline

2026-10-02 Threatist record created from CVE-2019-1817
2026-10-03 Alias added: GHSA-7577-f2mx-w9rc

References

Advisory 1

20190501 Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability

TI-2023-06741 Buffer overflow in Cisco Secure Web Appliance CVSS 3.1CRITICAL 9.8
TI-2018-00369 Uncontrolled resource consumption in Cisco AsyncOS Software for Cisco Web Security… CVSS 3.0HIGH 8.6
TI-2019-01508 Cisco Web Security Appliance HTTPS Certificate Denial of Service Vulnerability CVSS 3.1HIGH 8.6
TI-2018-00312 A vulnerability in traffic-monitoring functions in Cisco Web Security Appliance (WSA)… CVSS 3.0HIGH 7.5
TI-2021-01086 Cisco Web Security Appliance Privilege Escalation Vulnerability CVSS 3.1HIGH 8.8
TI-2019-11999 Cisco Web Security Appliance Unauthorized Device Reset Vulnerability CVSS 3.1HIGH 8.8

See all 64 →

Sources

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