CVE-2021-43697Network attack vector

Reflected XSS via unsanitized JSONP callback

Published Nov 29, 2021 · Updated Aug 4, 2024

Cross-site scripting in Workerman-ThinkPHP-Redis before 2018-03-16 allows remote attackers to execute script in a user's browser. Controller.class.php reads the VAR_JSONP_HANDLER query parameter and concatenates it unescaped into the JavaScript response passed to exit(). Exploitation requires user interaction; injected script runs in the affected site's browser origin, exposing browser-accessible data and actions without interrupting the service.

CVSS severity6.1
Medium
EPSS probability0.64%
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 Workerman-ThinkPHP-Redis before 2018-03-16 allows remote attackers to execute script in a user's browser. Controller.class.php reads the VAR_JSONP_HANDLER query parameter and concatenates it unescaped into the JavaScript response passed to exit(). Exploitation requires user interaction; injected script runs in the affected site's browser origin, exposing browser-accessible data and actions without interrupting the service.

The record

CVE
CVE-2021-43697
Published
Nov 29, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS: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')
T1204.001User Execution: Malicious Link

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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