How severe is CVE-2025-3449?

CVE-2025-3449 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-3449 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-3449?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-3449 have an EU (EUVD) identifier?

Yes. CVE-2025-3449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31915.

When was CVE-2025-3449 published?

CVE-2025-3449 was published on 2025-10-07 and last updated on 2026-06-17.

CVE-2025-3449

CVE-2025-3449 is a medium-severity vulnerability with a CVSS 3.x base score of 4.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-340.

Key facts

Severity: Medium (CVSS 3.x base score 4.2)
CVSS v4: 2.3
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-31915
Weakness: CWE-340
Published: 2025-10-07
Last modified: 2026-06-17

Description

A Generation of Predictable Numbers or Identifiers vulnerability in the SDM component of B&R Automation Runtime versions before 6.4 may allow an unauthenticated network-based attacker to take over already established sessions.

Frequently asked questions

What is CVE-2025-3449?: A Generation of Predictable Numbers or Identifiers vulnerability in the SDM component of B&R Automation Runtime versions before 6.4 may allow an unauthenticated network-based attacker to take over already established sessions.
How severe is CVE-2025-3449?: CVE-2025-3449 has a CVSS 3.x base score of 4.2, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-3449 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-3449?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-3449 have an EU (EUVD) identifier?: Yes. CVE-2025-3449 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-31915.
When was CVE-2025-3449 published?: CVE-2025-3449 was published on 2025-10-07 and last updated on 2026-06-17.

References

https://www.br-automation.com/fileadmin/SA25P003-178b6a20.pdf

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