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CVE-2019-1884

Cisco Web Security Appliance Web Proxy Denial of Service Vulnerability

HIGH
7.7
CVSS Score
Published: July 4, 2019 at 07:50 PM UTC
Updated: June 17, 2026 at 02:29 AM UTC
2 products affected across 1 vendorWeb Security ApplianceAsyncos

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Severity
HIGH7.7
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A vulnerability in the web proxy functionality of Cisco AsyncOS Software for Cisco Web Security Appliance (WSA) could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient input validation mechanisms for certain fields in HTTP/HTTPS requests sent through an affected device. A successful attacker could exploit this vulnerability by sending a malicious HTTP/HTTPS request through an affected device. An exploit could allow the attacker to force the device to stop processing traffic, resulting in a DoS condition.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Asyncos· Cisco
95%
10.1 ≤ v < 10.5.5-00511.5 ≤ v < 11.5.2-02011.7 ≤ v < 11.7.0-407
Affected range stops below 10.5.5-005, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.5.2-020, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.7.0-407, so it looks safe — our inference, not a vendor statement
Web Security Appliance· Cisco
95%
v < 10.5.5-00510.1.4-01710.5.2-07211.5.1-fcs-12511.7.0-256
Affected range stops below 10.5.5-005, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisoryx_refsource_CISCO
Source: [email protected]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190703-asyncos-wsa

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGHcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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