CVE-2021-1380Network attack vector

Script execution via unvalidated management-interface input

Published Apr 8, 2021 · Updated Nov 8, 2024

Cross-site scripting in Cisco Unity Connection before 14 allows remote attackers to execute script code via a crafted management link. Cisco has not identified the affected parameter; the web-based management interface does not properly validate user-supplied input. Exploitation requires an interface user to follow the link, after which code runs in that interface context and can access browser-held information.

CVSS severity6.1
Medium
EPSS probability0.82%
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 Unity Connection before 14 allows remote attackers to execute script code via a crafted management link. Cisco has not identified the affected parameter; the web-based management interface does not properly validate user-supplied input. Exploitation requires an interface user to follow the link, after which code runs in that interface context and can access browser-held information.

The record

CVE
CVE-2021-1380
Published
Apr 8, 2021
Updated
Nov 8, 2024
Vendor
ClamAV
Product
Cisco Unity Connection
Classifications
CWE-79, CWE-89, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 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 Unity Connectionversion=n/a

Published CVSS scores

4.3NISTAV:N/AC:M/Au:N/C:N/I:P/A:N
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.

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')
CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
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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