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CVE-2020-3147

Cisco Small Business Switches Denial of Service Vulnerability

HIGH
7.5
CVSS Score
Published: January 29, 2020 at 10:10 PM UTC
Updated: June 17, 2026 at 03:17 AM UTC
115 products affected across 1 vendorSg300-10pp FirmwareSg300-28mp FirmwareSf300-48pp Firmware

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

Description

A vulnerability in the web UI of Cisco Small Business Switches 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 requests sent to the web interface. An attacker could exploit this vulnerability by sending a malicious request to the web interface of an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. This vulnerability affects firmware releases prior than 1.3.7.18

Affected

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

Sf300-08 Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-08 (same device)
Sf300-24 Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-24 (same device)
Sf300-24mp Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-24mp (same device)
Sf300-24p Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-24p (same device)
Sf300-24pp Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-24pp (same device)
Sf300-48 Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-48 (same device)
Sf300-48p Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-48p (same device)
Sf300-48pp Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf300-48pp (same device)
Sf302-08 Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf302-08 (same device)
Sf302-08mp Firmware· Cisco
95%
v < 1.3.7.18
Affected range stops below 1.3.7.18, so it looks safe — our inference, not a vendor statement
cisco-sf302-08mp (same device)

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-smlbus-switch-dos-R6VquS2u

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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