CVE-2021-23888Public exploitNetwork attack vector

Information theft via unvalidated iframe URL

Published Mar 26, 2021 · Updated Aug 3, 2024

Open redirect in McAfee ePolicy Orchestrator before 5.10 Update 10 allows remote authenticated users to load untrusted iframe content. The dashboard route after the URL fragment accepts a scheme-relative external URL and renders that destination inside the lower ePO iframe. Exploitation requires an authenticated ePO user to open a crafted link in the same browser session; the attacker-controlled frame supports phishing or NetNTLM hash capture.

CVSS severity6.3
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Open redirect in McAfee ePolicy Orchestrator before 5.10 Update 10 allows remote authenticated users to load untrusted iframe content. The dashboard route after the URL fragment accepts a scheme-relative external URL and renders that destination inside the lower ePO iframe. Exploitation requires an authenticated ePO user to open a crafted link in the same browser session; the attacker-controlled frame supports phishing or NetNTLM hash capture.

The record

CVE
CVE-2021-23888
Published
Mar 26, 2021
Updated
Aug 3, 2024
Vendor
McAfee
Product
McAfee ePolicy Orchestrator
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <5.10 CU 10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

McAfee · McAfee ePolicy Orchestratorversion=unspecified <5.10 CU 10

Published CVSS scores

6.3TrellixCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
4.9NIST NVDAV:N/AC:M/Au:S/C:P/I:P/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo