CVE-2011-4861
CVE-2011-4861 is a critical-severity vulnerability in Schneider-electric Quantum Ethernet Module 140noe77100 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. The underlying weakness is classified as CWE-264.
Key facts
- Severity: Critical (CVSS 2.0 base score 10.0)
- EPSS exploit prediction: 3% (87th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-264
- Affected product: Schneider-electric Quantum Ethernet Module 140noe77100
- Published:
- Last modified:
Description
The modbus_125_handler function in the Schneider Electric Quantum Ethernet Module on the NOE 771 device (aka the Quantum 140NOE771* module) allows remote attackers to install arbitrary firmware updates via a MODBUS 125 function code to TCP port 502.
Frequently asked questions
- What is CVE-2011-4861?
- The modbus_125_handler function in the Schneider Electric Quantum Ethernet Module on the NOE 771 device (aka the Quantum 140NOE771* module) allows remote attackers to install arbitrary firmware updates via a MODBUS 125 function code to TCP port 502.
- How severe is CVE-2011-4861?
- CVE-2011-4861 has a CVSS 2.0 base score of 10.0, rated critical severity.
- Is CVE-2011-4861 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2011-4861?
- CVE-2011-4861 primarily affects Schneider-electric Quantum Ethernet Module 140noe77100. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2011-4861?
- 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-2011-4861 published?
- CVE-2011-4861 was published on 2011-12-17 and last updated on 2026-06-16.
References
Affected products (3)
- cpe:2.3:a:schneider-electric:quantum_ethernet_module_140noe77100:*:*:*:*:*:*:*:*
- cpe:2.3:a:schneider-electric:quantum_ethernet_module_140noe77101:*:*:*:*:*:*:*:*
- cpe:2.3:a:schneider-electric:quantum_ethernet_module_140noe77111:*:*:*:*:*:*:*:*
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