CVE-2021-40959Public exploitNetwork attack vector

Session-context script execution via unsanitized process parameter

Published Dec 20, 2024 · Updated Dec 25, 2024

Reflected XSS in MONITORAPP AIWAF 4.1.6 and earlier and 5.0 and earlier allows remote attackers to execute scripts in a victim's session. The process_status.xhr.php endpoint accepts the process query parameter and reflects an arbitrary HTML event-handler payload without sanitization. Exploitation requires a victim to follow a crafted request to the affected management page; successful script execution can read or alter data accessible to that victim's browser session.

CVSS severity6.1
Medium
EPSS probability0.23%
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 MONITORAPP AIWAF 4.1.6 and earlier and 5.0 and earlier allows remote attackers to execute scripts in a victim's session. The process_status.xhr.php endpoint accepts the process query parameter and reflects an arbitrary HTML event-handler payload without sanitization. Exploitation requires a victim to follow a crafted request to the affected management page; successful script execution can read or alter data accessible to that victim's browser session.

The record

CVE
CVE-2021-40959
Published
Dec 20, 2024
Updated
Dec 25, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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