CVE-2024-4791Public exploitNetwork attack vector

Persistent routing outage via unsupported Service Choice

Published May 12, 2024 · Updated Aug 8, 2024

Denial of service in Contemporary Controls BASrouter 2.7.2 allows remote attackers to halt BACnet routing via a malformed APDU. The APDU parser accepts an unsupported value in the implicitly reserved Service Choice field and enters a persistent fault state instead of rejecting the request. No authentication or user interaction is required on a reachable BACnet network; recovery requires physically power-cycling the appliance, and traffic between BACnet/IP and MS/TP remains interrupted until then.

CVSS severity8.7
High
EPSS probability1.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Contemporary Controls BASrouter 2.7.2 allows remote attackers to halt BACnet routing via a malformed APDU. The APDU parser accepts an unsupported value in the implicitly reserved Service Choice field and enters a persistent fault state instead of rejecting the request. No authentication or user interaction is required on a reachable BACnet network; recovery requires physically power-cycling the appliance, and traffic between BACnet/IP and MS/TP remains interrupted until then.

The record

CVE
CVE-2024-4791
Published
May 12, 2024
Updated
Aug 8, 2024
Vendor
Contemporary Controls
Product
BASrouter
Classifications
CWE-404, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 8, 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=2.7.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Contemporary Controls · BASrouterversion=2.7.2

Published CVSS scores

8.7VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.8VulDBAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

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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