CVE-2021-20386Network attack vector

Credential disclosure via embedded Web UI JavaScript

Published May 24, 2021 · Updated Sep 16, 2024

Cross-site scripting in IBM Security Guardium 11.2 allows remote attackers to execute JavaScript in a victim's Web UI session. The Web UI embeds attacker-supplied JavaScript into rendered content without neutralizing it; IBM has not disclosed the affected page or parameter. A victim must interact with the crafted content, after which the script can alter interface behavior and expose credentials within the trusted session.

CVSS severity6.1
Medium
EPSS probability0.65%
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 Security Guardium 11.2 allows remote attackers to execute JavaScript in a victim's Web UI session. The Web UI embeds attacker-supplied JavaScript into rendered content without neutralizing it; IBM has not disclosed the affected page or parameter. A victim must interact with the crafted content, after which the script can alter interface behavior and expose credentials within the trusted session.

The record

CVE
CVE-2021-20386
Published
May 24, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM Security Guardium
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 24, 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=11.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM Security Guardiumversion=11.2

Published CVSS scores

5.8IBMCVSS:3.0/A:N/PR:N/AV:N/C:L/UI:R/I:L/S:C/AC:L/RC:C/RL:O/E:H
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1IBMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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