CVE-2021-20528Network attack vector

Credential disclosure via stored Web UI scripts

Published May 19, 2021 · Updated Sep 17, 2024

Cross-site scripting in IBM Sterling Control Center 6.2.0.0 allows remote authenticated users to disclose credentials through the Web UI. IBM states that user-supplied JavaScript is embedded in the Web UI, but has not published the affected input, storage path, or rendering locus. Exploitation requires low-privileged access and interaction within a trusted session; the reported consequences are credential disclosure and alteration of Web UI behavior.

CVSS severity5.4
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in IBM Sterling Control Center 6.2.0.0 allows remote authenticated users to disclose credentials through the Web UI. IBM states that user-supplied JavaScript is embedded in the Web UI, but has not published the affected input, storage path, or rendering locus. Exploitation requires low-privileged access and interaction within a trusted session; the reported consequences are credential disclosure and alteration of Web UI behavior.

The record

CVE
CVE-2021-20528
Published
May 19, 2021
Updated
Sep 17, 2024
Vendor
IBM
Product
IBM Sterling Control Center
Classifications
CWE-79
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 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=6.2.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

IBM · IBM Sterling Control Centerversion=6.2.0.0

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4IBMCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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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