CVE-2020-3147

highpriority · track · 31EPSS 0.023 · 83 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

2.28% (83rd) EPSS

CVSS 7.8 · high

Is it mine?

63 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-28

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

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco Small Business 200 Series Smart Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
FixedCisco Small Business 300 Series Managed Switchescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

8.6

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–8.6

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Cprimary · NVD / NIST USexploitability 10 · impact 6.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · ENISA EU

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · psirt@cisco.com USexploitability 3.9 · impact 4

v3.08.6highCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · Cisco PSIRT US

v3.18.6highAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20US

affected products (63)

Products and version ranges known to be affected.

Cisco Cisco Small Business 200 Series Smart Switchesall versionscisco_csafUS
Cisco Cisco Small Business 300 Series Managed Switchesall versionscisco_csafUS
Cisco Cisco Small Business 300 Series Managed Switchesunspecified → 1.3.7.18enisa_euvdEU
Cisco Systems Inc. Cisco Small Business 200 Series Smart Switches≤ 1.3.7.18fstec_bduRU
Cisco Systems Inc. Cisco Small Business 300 Series≤ 1.3.7.18fstec_bduRU
Cisco Systems Inc. Cisco Small Business 500 Series≤ 1.3.7.18fstec_bduRU
cisco sf300-08 firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-08_firmware:*:*:*:*:*:*:*:*
cisco sf300-24 firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-24_firmware:*:*:*:*:*:*:*:*
cisco sf300-24mp firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-24mp_firmware:*:*:*:*:*:*:*:*
cisco sf300-24p firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-24p_firmware:*:*:*:*:*:*:*:*
cisco sf300-24pp firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-24pp_firmware:*:*:*:*:*:*:*:*
cisco sf300-48 firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-48_firmware:*:*:*:*:*:*:*:*
cisco sf300-48p firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-48p_firmware:*:*:*:*:*:*:*:*
cisco sf300-48pp firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf300-48pp_firmware:*:*:*:*:*:*:*:*
cisco sf302-08 firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf302-08_firmware:*:*:*:*:*:*:*:*
cisco sf302-08mp firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf302-08mp_firmware:*:*:*:*:*:*:*:*
cisco sf302-08mpp firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf302-08mpp_firmware:*:*:*:*:*:*:*:*
cisco sf302-08p firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf302-08p_firmware:*:*:*:*:*:*:*:*
cisco sf302-08pp firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf302-08pp_firmware:*:*:*:*:*:*:*:*
cisco sf500-24 firmware< 1.3.7.18nvdUScpe:2.3:o:cisco:sf500-24_firmware:*:*:*:*:*:*:*:*

showing 20 of 63

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-smlbus-switch-dos-R6VquS2uCisco Small Business Switches Denial of Service Vulnerability2020-01-29csaf · cisco_csafUS
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. Cisco has released software updates that address the vulnerability described in this advisory. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smlbus-switch-dos-R6VquS2u ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smlbus-switch-dos-R6VquS2u"]

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2020-01-30modified 2026-06-17

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+25194 more

references (4)

External citations — patches, advisories, analysis.

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