CVE-2021-22983Network attack vector

Authenticated script execution via crafted utility URL

Published Feb 12, 2021 · Updated Aug 3, 2024

Reflected XSS in F5 BIG-IP AFM 13.1.x, 14.1.x, and 15.1.x allows remote authenticated users to execute script through a crafted URL. Public records identify the Configuration utility URL as the locus but do not disclose the affected parameter or its output-encoding failure. Exploitation requires another authenticated Configuration utility user to open the URL, exposing browser-session data to reading or modification.

CVSS severity5.4
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in F5 BIG-IP AFM 13.1.x, 14.1.x, and 15.1.x allows remote authenticated users to execute script through a crafted URL. Public records identify the Configuration utility URL as the locus but do not disclose the affected parameter or its output-encoding failure. Exploitation requires another authenticated Configuration utility user to open the URL, exposing browser-session data to reading or modification.

The record

CVE
CVE-2021-22983
Published
Feb 12, 2021
Updated
Aug 3, 2024
Vendor
F5 Networks
Product
BIG-IP Advanced Firewall Manager
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 12, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.1.x before 15.1.1, 14.1.x before 14.1.3.1, and 13.1.x before 13.1.3.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

F5 Networks · BIG-IP Advanced Firewall Managerversion=15.1.x before 15.1.1, 14.1.x before 14.1.3.1, and 13.1.x before 13.1.3.5

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/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')
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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