CVE-2021-1500Network attack vector

Open redirect via improperly validated URL parameters

Published Nov 4, 2021 · Updated Nov 7, 2024

Open redirect in Cisco Webex Video Mesh before 2021.10.18.2439m allows unauthenticated remote attackers to redirect users through crafted links. The web-based management interface fails to validate URL parameters in HTTP requests before using them to determine a redirect destination. Exploitation requires a user to click the crafted link, after which the browser visits an attacker-chosen site that can support phishing.

CVSS severity5.4
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Cisco Webex Video Mesh before 2021.10.18.2439m allows unauthenticated remote attackers to redirect users through crafted links. The web-based management interface fails to validate URL parameters in HTTP requests before using them to determine a redirect destination. Exploitation requires a user to click the crafted link, after which the browser visits an attacker-chosen site that can support phishing.

The record

CVE
CVE-2021-1500
Published
Nov 4, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco Webex Video Mesh
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 4, 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 Webex Video Meshversion=n/a

Published CVSS scores

5.4CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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-601URL Redirection to Untrusted Site ('Open Redirect')
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

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Your stack

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