CVE-2009-3739

CVE-2009-3739 is a critical-severity vulnerability in Rockwellautomation Ab Micrologix Controller 1100 with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Description

Multiple unspecified vulnerabilities on the Rockwell Automation AB Micrologix 1100 and 1400 controllers allow remote attackers to obtain privileged access or cause a denial of service (halt) via unknown vectors.

Frequently asked questions

What is CVE-2009-3739?
Multiple unspecified vulnerabilities on the Rockwell Automation AB Micrologix 1100 and 1400 controllers allow remote attackers to obtain privileged access or cause a denial of service (halt) via unknown vectors.
How severe is CVE-2009-3739?
CVE-2009-3739 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2009-3739 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (90th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3739?
CVE-2009-3739 primarily affects Rockwellautomation Ab Micrologix Controller 1100. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3739?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-3739 published?
CVE-2009-3739 was published on 2010-01-19 and last updated on 2026-06-16.

References

Affected products (2)