CVE-2021-1310Network attack vector

User redirection via improperly validated URL parameters

Published Jan 13, 2021 · Updated Sep 17, 2024

Open redirect in Cisco Webex Meetings sites before November 24, 2020 allows remote attackers to redirect users to malicious websites. The web-based management interface improperly validates URL parameters in crafted HTTP requests, allowing the supplied destination to bypass the Webex URL warning check. Exploitation requires a user to click a crafted link; the bounded result is an untrusted-site redirect that can support phishing.

CVSS severity4.7
Medium
EPSS probability1.58%
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 Meetings sites before November 24, 2020 allows remote attackers to redirect users to malicious websites. The web-based management interface improperly validates URL parameters in crafted HTTP requests, allowing the supplied destination to bypass the Webex URL warning check. Exploitation requires a user to click a crafted link; the bounded result is an untrusted-site redirect that can support phishing.

The record

CVE
CVE-2021-1310
Published
Jan 13, 2021
Updated
Sep 17, 2024
Vendor
ClamAV
Product
Webex Meetings
Classifications
CWE-601, CAPEC-178, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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 · Webex Meetingsversion=n/a

Published CVSS scores

4.7Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
CAPEC-178Cross-Site Flashing
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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