CVE-2021-1525Network attack vector

Malicious file redirection via unvalidated URL paths

Published Jun 4, 2021 · Updated Nov 7, 2024

Open redirect in Cisco WebEx Meetings Server allows remote attackers to present malicious files in its web UI via crafted URLs. The application interface does not properly validate URL paths, so a crafted request causes the web UI to include and offer a remote file. Exploitation is unauthenticated but requires a user to follow the crafted link; the trusted-site presentation enables phishing or spoofing.

CVSS severity4.7
Medium
EPSS probability0.78%
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 Server allows remote attackers to present malicious files in its web UI via crafted URLs. The application interface does not properly validate URL paths, so a crafted request causes the web UI to include and offer a remote file. Exploitation is unauthenticated but requires a user to follow the crafted link; the trusted-site presentation enables phishing or spoofing.

The record

CVE
CVE-2021-1525
Published
Jun 4, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Cisco WebEx Meetings Server
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco WebEx Meetings Serverversion=n/a

Published CVSS scores

4.7CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/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.

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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-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001User Execution: Malicious Link

Public exploit references

No public exploit references are available in this record.

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Technologies

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Your stack

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