CVE-2021-1543Network attack vector

Unauthenticated script execution via insufficient input validation

Published Jun 16, 2021 · Updated Nov 7, 2024

Cross-site scripting in Cisco 220 Series Smart Plus Switches before 1.2.0.6 allows remote attackers to execute script in a user's browser. The web-based management interface insufficiently validates user-supplied input on an affected page, allowing a crafted link to inject script code. Exploitation requires the web interface to be enabled and a user to open the link; the script can access browser-held data or redirect the user.

CVSS severity6.1
Medium
EPSS probability9.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Cisco 220 Series Smart Plus Switches before 1.2.0.6 allows remote attackers to execute script in a user's browser. The web-based management interface insufficiently validates user-supplied input on an affected page, allowing a crafted link to inject script code. Exploitation requires the web interface to be enabled and a user to open the link; the script can access browser-held data or redirect the user.

The record

CVE
CVE-2021-1543
Published
Jun 16, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco 220 Series Smart Plus Switches
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco 220 Series Smart Plus Switchesversion=n/a

Published CVSS scores

6.1CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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