CVE-2021-1543

mediumpriority · track · 27EPSS 0.093 · 95 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

9.32% (95th) EPSS

CVSS 4.3 · medium

Is it mine?

12 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

Multiple vulnerabilities in the web-based management interface of Cisco Small Business 220 Series Smart Switches could allow an attacker to do the following: Hijack a user session Execute arbitrary commands as a root user on the underlying operating system Conduct a cross-site scripting (XSS) attack Conduct an HTML injection attack For more information about these vulnerabilities, see the Details section of this advisory.

remediations

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

A vendor fix is available.

FixedCisco Small Business 220 Series Smart Plus 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.

7.2

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–7.2

v2.04.3mediumAV:N/AC:M/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 2.9

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 2.8 · impact 2.7

v3.16.1mediumAV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.17.2highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:Hsecondary · psirt@cisco.com USexploitability 1.2 · impact 5.9

v3.15.6mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.16.1mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:Nsecondary · Cisco PSIRT US

ssvc

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

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79USprimaryCWE-287USCWE-79US

affected products (12)

Products and version ranges known to be affected.

Cisco Cisco Small Business 220 Series Smart Plus Switchesall versionscisco_csafUS
Cisco Cisco Small Business 220 Series Smart Plus Switches≤ n/aenisa_euvdEU
Cisco Systems Inc. Cisco Small Business 220 Series Smart Switches≤ 1.2.0.6fstec_bduRU
cisco sf220-24 firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sf220-24_firmware:*:*:*:*:*:*:*:*
cisco sf220-24p firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sf220-24p_firmware:*:*:*:*:*:*:*:*
cisco sf220-48 firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sf220-48_firmware:*:*:*:*:*:*:*:*
cisco sf220-48p firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sf220-48p_firmware:*:*:*:*:*:*:*:*
cisco sg220-26 firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sg220-26_firmware:*:*:*:*:*:*:*:*
cisco sg220-26p firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sg220-26p_firmware:*:*:*:*:*:*:*:*
cisco sg220-28mp firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sg220-28mp_firmware:*:*:*:*:*:*:*:*
cisco sg220-50 firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sg220-50_firmware:*:*:*:*:*:*:*:*
cisco sg220-50p firmware< 1.2.0.6nvdUScpe:2.3:o:cisco:sg220-50p_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-ciscosb-multivulns-Wwyb7s5ECisco Small Business 220 Series Smart Switches Vulnerabilities2021-06-16csaf · cisco_csafUS
Multiple vulnerabilities in the web-based management interface of Cisco Small Business 220 Series Smart Switches could allow an attacker to do the following: Hijack a user session Execute arbitrary commands as a root user on the underlying operating system Conduct a cross-site scripting (XSS) attack Conduct an HTML injection attack For more information about these vulnerabilities, see the Details ["#details"] section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.

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 2021-06-16modified 2026-06-17

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+53008 more

references (5)

External citations — patches, advisories, analysis.

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