CVE-2021-1605Network attack vector

Stored XSS via insufficient input validation

Published Jul 8, 2021 · Updated Nov 7, 2024

Stored XSS in Cisco Identity Services Engine allows remote authenticated users to execute scripts through crafted management-interface pages. The web interface stores malicious code injected into unspecified pages because it does not sufficiently validate user-supplied input. Valid administrative credentials and interaction by another interface user are required; successful exploitation can expose browser-based information or run code in that user’s interface context.

CVSS severity4.8
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Cisco Identity Services Engine allows remote authenticated users to execute scripts through crafted management-interface pages. The web interface stores malicious code injected into unspecified pages because it does not sufficiently validate user-supplied input. Valid administrative credentials and interaction by another interface user are required; successful exploitation can expose browser-based information or run code in that user’s interface context.

The record

CVE
CVE-2021-1605
Published
Jul 8, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-79, T1203
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 8, 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 privilegesadmin

What is affected?

ClamAV · Cisco Identity Services Engineversion=n/a

Published CVSS scores

4.8CiscoCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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