CVE-2021-23006Network attack vector

Cross-site scripting via reflected page input

Published Mar 31, 2021 · Updated Aug 3, 2024

Reflected cross-site scripting in F5 Networks BIG-IQ 6.x and 7.x allows remote attackers to execute script via undisclosed pages. The affected pages and input handling flaw are undisclosed in the vendor record, so the exact reflection point is not public. Exploitation requires a victim to load attacker-controlled content in a BIG-IQ session and can alter page content or perform actions with that session's privileges.

CVSS severity6.1
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected cross-site scripting in F5 Networks BIG-IQ 6.x and 7.x allows remote attackers to execute script via undisclosed pages. The affected pages and input handling flaw are undisclosed in the vendor record, so the exact reflection point is not public. Exploitation requires a victim to load attacker-controlled content in a BIG-IQ session and can alter page content or perform actions with that session's privileges.

The record

CVE
CVE-2021-23006
Published
Mar 31, 2021
Updated
Aug 3, 2024
Vendor
F5 Networks
Product
BIG-IQ
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=All 7.x and 6.x versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · BIG-IQversion=All 7.x and 6.x versions

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NVDAV:N/AC:M/Au:N/C:N/I:P/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')
T1189Drive-by Compromise

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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