CVE-2021-20534Network attack vector

Authenticated phishing via undisclosed open redirect

Published Jul 15, 2021 · Updated Sep 16, 2024

Open redirect in IBM Security Verify Access Docker 10.0.0 allows remote authenticated users to direct victims to malicious websites. IBM has not disclosed the affected URL handler or the validation error that permits an attacker-controlled destination under a trusted-looking URL. Exploitation requires high-privileged access and a victim who follows the crafted link, enabling phishing without direct data disclosure or service interruption.

CVSS severity4.5
Medium
EPSS probability0.55%
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 IBM Security Verify Access Docker 10.0.0 allows remote authenticated users to direct victims to malicious websites. IBM has not disclosed the affected URL handler or the validation error that permits an attacker-controlled destination under a trusted-looking URL. Exploitation requires high-privileged access and a victim who follows the crafted link, enabling phishing without direct data disclosure or service interruption.

The record

CVE
CVE-2021-20534
Published
Jul 15, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Security Verify Access Docker
Classifications
T1204.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=10.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

IBM · IBM Security Verify Access Dockerversion=10.0.0

Published CVSS scores

4.5IBMCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.001Malicious 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

Your stack

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Your stack

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