CVE-2021-1444Network attack vector

Browser script execution via insufficient input validation

Published Nov 18, 2024 · Updated Nov 18, 2024

Cross-site scripting in Cisco Adaptive Security Appliance Software allows remote attackers to run script code through its web services interface. The interface insufficiently validates user-supplied input delivered by a crafted link before the browser interprets it. Exploitation requires a user to follow the link and an affected AnyConnect or WebVPN configuration; resulting script runs in the interface context and can read sensitive browser-based information.

CVSS severity6.1
Medium
EPSS probability0.43%
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 Adaptive Security Appliance Software allows remote attackers to run script code through its web services interface. The interface insufficiently validates user-supplied input delivered by a crafted link before the browser interprets it. Exploitation requires a user to follow the link and an affected AnyConnect or WebVPN configuration; resulting script runs in the interface context and can read sensitive browser-based information.

The record

CVE
CVE-2021-1444
Published
Nov 18, 2024
Updated
Nov 18, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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=9.0.1.1
  2. Affected versionversion=9.0.1.2
  3. Affected versionversion=9.0.1.4
  4. Affected versionversion=9.0.2.12
  5. Affected versionversion=9.0.2.2
  6. Affected versionversion=9.0.2.6
  7. Affected versionversion=9.0.3.1
  8. Affected versionversion=9.0.3.10
  9. Affected versionversion=9.0.3.3
  10. Affected versionversion=9.1.1.2
  11. Affected versionversion=9.1.1.7
  12. Affected versionversion=9.1.1.8
  13. Affected versionversion=9.1.2
  14. Affected versionversion=9.1.2.3
  15. Affected versionversion=9.1.2.5
  16. Affected versionversion=9.1.2.6
  17. Affected versionversion=9.1.3.4
  18. Affected versionversion=9.1.4.3
  19. Affected versionversion=9.1.4.6
  20. Affected versionversion=9.1.5.1
  21. Affected versionversion=9.1.5.2
  22. Affected versionversion=9.1.5.3
  23. Affected versionversion=9.1.5.6
  24. Affected versionversion=9.1.5.7
  25. Affected versionversion=9.3.1
  26. Affected versionversion=9.4.2.11
  27. Affected versionversion=9.4.2.6
  28. Affected versionversion=9.5.3.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=9.0.1.1; version=9.0.1.2; version=9.0.1.4; version=9.0.2.12; version=9.0.2.2; version=9.0.2.6; version=9.0.3.1; version=9.0.3.10; version=9.0.3.3; version=9.1.1.2; version=9.1.1.7; version=9.1.1.8; version=9.1.2; version=9.1.2.3; version=9.1.2.5; version=9.1.2.6; version=9.1.3.4; version=9.1.4.3; version=9.1.4.6; version=9.1.5.1; version=9.1.5.2; version=9.1.5.3; version=9.1.5.6; version=9.1.5.7; version=9.3.1; version=9.4.2.11; version=9.4.2.6; version=9.5.3.1

Published CVSS scores

6.1Cisco Systems, Inc.CVSS: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.

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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')
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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