CVE-2020-4635Network attack vector

Unauthenticated username enumeration

Published Mar 19, 2021 · Updated Sep 17, 2024

Username enumeration in IBM Security QRadar SOAR 40 and earlier allows remote attackers to determine whether an account exists. IBM has not disclosed the affected request handler, probe sequence, or response difference that exposes account validity. No authentication or user interaction is required, and the disclosed consequence is limited to learning valid usernames.

CVSS severity3.7
Low
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Username enumeration in IBM Security QRadar SOAR 40 and earlier allows remote attackers to determine whether an account exists. IBM has not disclosed the affected request handler, probe sequence, or response difference that exposes account validity. No authentication or user interaction is required, and the disclosed consequence is limited to learning valid usernames.

The record

CVE
CVE-2020-4635
Published
Mar 19, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM Security QRadar SOAR
Classifications
T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 19, 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=SOAR 40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Security QRadar SOARversion=SOAR 40

Published CVSS scores

3.7IBMCVSS: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.

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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

T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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