CVE-2025-13926Network attack vector

Unauthenticated arbitrary requests via forged network packets

Published Apr 9, 2026 · Updated Apr 9, 2026

Authentication bypass in Contemporary Controls BASControl20 3.1 allows remote attackers to send arbitrary requests over BACnet/IP. The controller accepts forged packets built from values exposed in sniffed network traffic, relying on attacker-controlled input for its security decision. An attacker must observe relevant network traffic before forging requests; successful requests can reconfigure, rename, or delete PLC components and invoke file transfers or remote procedures.

CVSS severity9.3
Critical
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Contemporary Controls BASControl20 3.1 allows remote attackers to send arbitrary requests over BACnet/IP. The controller accepts forged packets built from values exposed in sniffed network traffic, relying on attacker-controlled input for its security decision. An attacker must observe relevant network traffic before forging requests; successful requests can reconfigure, rename, or delete PLC components and invoke file transfers or remote procedures.

The record

CVE
CVE-2025-13926
Published
Apr 9, 2026
Updated
Apr 9, 2026
Vendor
Contemporary Controls
Product
BAScontrol20
Classifications
CWE-807, T1040, T0855
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 9, 2026Record 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Contemporary Controls · BAScontrol20version=3.1

Published CVSS scores

9.3ICS-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 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-807Reliance on Untrusted Inputs in a Security Decision
T1040Network Sniffing
T0855Unauthorized Command Message

Public exploit references

No public exploit references are available in this record.

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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