CVE-2021-31250Public exploitNetwork attack vector

Stored script execution via unsanitized CGI input

Published Jun 4, 2021 · Updated Aug 3, 2024

Stored XSS in CHIYU Technology BF-430, BF-431, and BF-450M devices allows remote authenticated users to execute script in the management UI. The man.cgi, if.cgi, dhcpc.cgi, and ppp.cgi handlers accept unsanitized parameter values, allowing crafted scripts to persist and run when management pages render them. Exploitation requires authenticated access and a management user to view the stored payload; executed script can read session cookies or redirect the user.

CVSS severity5.4
Medium
EPSS probability79.61%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in CHIYU Technology BF-430, BF-431, and BF-450M devices allows remote authenticated users to execute script in the management UI. The man.cgi, if.cgi, dhcpc.cgi, and ppp.cgi handlers accept unsanitized parameter values, allowing crafted scripts to persist and run when management pages render them. Exploitation requires authenticated access and a management user to view the stored payload; executed script can read session cookies or redirect the user.

The record

CVE
CVE-2021-31250
Published
Jun 4, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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