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CVE-2019-1817

Cisco Web Security Appliance Malformed Request Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: May 3, 2019 at 04:30 PM UTC
Updated: June 17, 2026 at 02:29 AM UTC
1 product affected across 1 vendorWeb Security Appliance

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Severity
HIGH7.5
Exploit prediction
EPSS 2%
SSVC
No known exploit

Description

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.

Affected

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

Web Security Appliance· Cisco
95%
v < 11.5.2-020v < 11.7.0-40611.5.1-fcs-11511.5.1-fcs-12411.5.1-fcs-12511.7.0-fcs-334
Affected range stops below 11.5.2-020, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.7.0-406, 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-20190501-wsa-dos

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20

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