CVE-2020-8839Public exploitNetwork attack vector

Stored XSS via unsanitized TF_submask

Published Feb 12, 2020 · Updated Aug 4, 2024

Stored XSS in CHIYU BF-430 232/485 TCP/IP Converter before 1.16.00 allows remote attackers to execute script via /if.cgi. The /if.cgi handler stores TF_submask input without adequate validation, and the stored payload executes when the web interface renders that value. Exploitation requires a victim to view the affected page; successful attacks can read or alter data in the victim's browser context but do not interrupt device availability.

CVSS severity6.1
Medium
EPSS probability2.07%
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 BF-430 232/485 TCP/IP Converter before 1.16.00 allows remote attackers to execute script via /if.cgi. The /if.cgi handler stores TF_submask input without adequate validation, and the stored payload executes when the web interface renders that value. Exploitation requires a victim to view the affected page; successful attacks can read or alter data in the victim's browser context but do not interrupt device availability.

The record

CVE
CVE-2020-8839
Published
Feb 12, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2020CVE 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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')

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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