CVE-2020-3121

Cisco Small Business Smart and Managed Switches Cross-Site Scripting Vulnerability

MEDIUM
6.1
CVSS Score
Published: January 26, 2020 at 04:31 AM UTC
Updated: June 17, 2026 at 03:17 AM UTC
91 products affected across 1 vendorSG550X 24P FirmwareSG550X 24MPP FirmwareSG550X 48MP Firmware

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Severity
MEDIUM6.1
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A vulnerability in the web-based management interface of Cisco Small Business Smart and Managed Switches could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. The vulnerability is due to insufficient validation of user-supplied input by the web-based management interface of the affected device. An attacker could exploit this vulnerability by persuading a user of the interface to click a malicious link and access a specific page. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.

Affected

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

v ≤ 2.5.0.90
cisco-sf350-48 (same device)
v ≤ 2.5.0.90
cisco-sf350-48mp (same device)
v ≤ 2.5.0.90
cisco-sf350-48p (same device)
v ≤ 2.5.0.90
cisco-sf550x-24 (same device)
v ≤ 2.5.0.90
cisco-sf550x-24p (same device)
v ≤ 2.5.0.90
cisco-sf550x-48 (same device)
v ≤ 2.5.0.90
cisco-sf550x-48mp (same device)
v ≤ 2.5.0.90
cisco-sf550x-48p (same device)
v ≤ 2.5.0.90
cisco-sg250-08 (same device)
v ≤ 2.5.0.90
cisco-sg250-08hp (same device)

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
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-79

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