CVE-2025-3449Network attack vector

Session takeover via predictable SDM identifiers

Published Oct 7, 2025 · Updated Oct 7, 2025

Predictable session identifiers in B&R Automation Runtime before 6.4 allow remote attackers to take over established SDM sessions. The System Diagnostic Manager generates guessable session IDs, so a predicted identifier can be used to assume an existing browser session. Exploitation requires network access, a running SDM instance, an established user session, and successful token prediction; SDM is disabled by default and exposes no session-specific data or session-level authentication.

CVSS severity2.3
Low
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Predictable session identifiers in B&R Automation Runtime before 6.4 allow remote attackers to take over established SDM sessions. The System Diagnostic Manager generates guessable session IDs, so a predicted identifier can be used to assume an existing browser session. Exploitation requires network access, a running SDM instance, an established user session, and successful token prediction; SDM is disabled by default and exposes no session-specific data or session-level authentication.

The record

CVE
CVE-2025-3449
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
B&R Industrial Automation
Product
Automation Runtime
Classifications
CWE-340, T1550.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2025Record 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=6.0 <6.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

B&R Industrial Automation · Automation Runtimeversion=6.0 <6.4

Published CVSS scores

3.9B&R Industrial AutomationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C
4.2B&R Industrial AutomationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
2.3B&R Industrial AutomationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-340Generation of Predictable Numbers or Identifiers
T1550.004Use Alternate Authentication Material: Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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