CVE-2021-20429Network attack vector

Sensitive data disclosure via permissive cross-origin policy

Published May 14, 2021 · Updated Sep 16, 2024

Information disclosure in IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 allows remote attackers to read sensitive data. The application’s cross-origin policy authorizes untrusted origins to read responses that should remain same-origin. No authentication is required, but IBM rates exploitation as high complexity; the public advisory does not identify the exposed endpoints, eligible origins, or specific data fields.

CVSS severity3.7
Low
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in IBM QRadar User Behavior Analytics 1.0.0 through 4.1.0 allows remote attackers to read sensitive data. The application’s cross-origin policy authorizes untrusted origins to read responses that should remain same-origin. No authentication is required, but IBM rates exploitation as high complexity; the public advisory does not identify the exposed endpoints, eligible origins, or specific data fields.

The record

CVE
CVE-2021-20429
Published
May 14, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
QRadar SIEM
Classifications
CWE-863
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 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=1.0.0
  2. Affected versionversion=4.1.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · QRadar SIEMversion=1.0.0; version=4.1.1

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
3.7IBM CorporationCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/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-863Incorrect Authorization

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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