CVE-2020-3117

Cisco Web Security Appliance and Cisco Content Security Management Appliance HTTP Header Injection Vulnerability

MEDIUM
4.7
CVSS Score
Published: September 23, 2020 at 12:25 AM UTC
Updated: June 17, 2026 at 03:17 AM UTC
2 products affected across 1 vendorWeb Security ApplianceContent Security Management Appliance

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

A vulnerability in the API Framework of Cisco AsyncOS for Cisco Web Security Appliance (WSA) and Cisco Content Security Management Appliance (SMA) could allow an unauthenticated, remote attacker to inject crafted HTTP headers in the web server's response. The vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user to access a crafted URL and receive a malicious HTTP response. A successful exploit could allow the attacker to inject arbitrary HTTP headers into valid HTTP responses sent to a user's browser.

Affected

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

v < 13.0.0-187
Affected range stops below 13.0.0-187, 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:

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-113NVD-CWE-Other

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