CVE-2023-33276Public exploitNetwork attack vector

Browser script execution via unencoded 404 path

Published Jun 30, 2023 · Updated Nov 26, 2024

Reflected XSS in the Gira KNX IP Router web interface 3.1.3683.0 and 3.3.8.0 allows remote attackers to execute browser script. The 404 handler decodes a nonexistent request path and inserts it into a text/html response without context-sensitive HTML encoding. Exploitation requires a user to open a crafted URL; script then runs in that user's browser context, enabling page-content access or modification rather than device takeover.

CVSS severity6.1
Medium
EPSS probability0.48%
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 the Gira KNX IP Router web interface 3.1.3683.0 and 3.3.8.0 allows remote attackers to execute browser script. The 404 handler decodes a nonexistent request path and inserts it into a text/html response without context-sensitive HTML encoding. Exploitation requires a user to open a crafted URL; script then runs in that user's browser context, enabling page-content access or modification rather than device takeover.

The record

CVE
CVE-2023-33276
Published
Jun 30, 2023
Updated
Nov 26, 2024
Vendor
Gira
Product
Gira KNX IP Router
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 26, 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?

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

  1. Affected versionversion=3.1.3683.0
  2. Affected versionversion=3.3.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Gira · Gira KNX IP Routerversion=3.1.3683.0; version=3.3.8.0

Published CVSS scores

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 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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