Home/CVE/When an affected
product receives a valid CIP message from an unauthorized or unintended
source to Port 2222/TCP, Port
CVE
CVE-2012-6439
When an affected
product receives a valid CIP message from an unauthorized or unintended
source to Port 2222/TCP, Port
When an affected product receives a valid CIP message from an unauthorized or unintended source to Port 2222/TCP, Port 2222/UDP, Port 44818/TCP, or Port 44818/UDP that changes the product’s configuration and network parameters, a DoS condition can occur. This situation could cause loss of availability and a disruption of communication with other connected devices. Rockwell Automation EtherNet/IP products.
1756-ENBT, 1756-EWEB, 1768-ENBT, and 1768-EWEB communication modules.
CompactLogix L32E and L35E controllers.
1788-ENBT FLEXLogix adapter.
1794-AENTR FLEX I/O EtherNet/IP adapter.
ControlLogix 18 and earlier.
CompactLogix 18 and earlier.
GuardLogix 18 and earlier.
SoftLogix 18 and earlier.
CompactLogix controllers 19 and earlier.
SoftLogix controllers 19 and earlier.
ControlLogix controllers 20 and earlier.
GuardLogix controllers 20 and earlier.
and MicroLogix 1100 and 1400.
HIGH · CVSS 8.5
EPSS 0.28348
Schedule remediation
- EPSS ≥ 0.10 - elevated exploitation probability
- EPSS percentile: top 2% of all CVEs by exploitation likelihood
- CVSS base score ≥ 7.0
Sigma rules0
YARA rules0
Look this up elsewhere - one-click external pivots
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How to read a CVE - triage first, then detect and patch
This page is every public fact about CVE-2012-6439, cross-linked. Its job is to answer one question fast - does this need my attention now? - and then hand you the two things you do about it. Here is how an analyst reads it.
Triage: should I act now? Four signals, and they are not interchangeable:
CVSSseverity - how bad it is IF exploited, 0-10. A high CVSS alone is not urgency; a flaw can be a perfect 10 and never actually be attacked.
EPSSprobability - a model’s estimate of the chance it is exploited in the next 30 days, 0-1. This is the “will it actually happen” signal.
CISA KEVconfirmed - it is being exploited in the wild right now. The strongest signal on the page; KEV beats any score.
Weaponisedavailability - public exploits / PoCs, and especially Metasploit modules rated Excellent / Great. Reliable, packaged exploit code means low-skill attackers can use it today.
How they combine: KEV, or a dependable Metasploit module, means patch now regardless of CVSS. High CVSS + low EPSS + no exploit is real but not an emergency - schedule it. Low CVSS but KEV-listed still gets patched now. The verdict above already weighed these for you; this is how it got there.
Then what - two workflows:
Detectwhen you cannot patch today, follow this CVE to the ATT&CK techniques it enables, then Build a SIEM detection (the green button) - author a rule, test it in Atomic, deploy it. That buys visibility while the patch waits.
PatchAffected products / packages tell you if you are exposed; Fixed versions by distribution and Vendor advisories give the exact version that closes it.
Reading order for the panels below: verdict + badges, then Public exploits / Metasploit (is it weaponised), then ATT&CK techniques + Sigma / IDS rules (can I detect it), then Affected products / packages + Fixed versions (am I exposed, what patches it), then Threat actors / IOCs (who uses it), then Scoring & timeline / references (the evidence).
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ATT&CK techniques
20Techniques this CVE enables - linked via CWECAPECATT&CK. High◆ = named directly in ATT&CK or Nuclei templates.
T1014 · Rootkit T1027.009 · Embedded Payloads T1037 · Boot or Logon Initialization Scripts T1080 · Taint Shared Content T1505.005 · Terminal Services DLL T1542.003 · Bootkit T1543 · Create or Modify System Process T1543.001 · Launch Agent T1543.003 · Windows Service T1543.004 · Launch Daemon T1546.001 · Change Default File Association T1546.004 · Unix Shell Configuration Modification T1546.008 · Accessibility Features T1546.016 · Installer Packages T1547 · Boot or Logon Autostart Execution T1547.006 · Kernel Modules and Extensions T1553.004 · Install Root Certificate T1556.006 · Multi-Factor Authentication T1562.001 · Disable or Modify Tools T1562.002 · Disable Windows Event Logging
▤ Build a SIEM detection for these techniques
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CAPEC attack patterns
12Attack patterns this CVE enables - the bridge from weakness to ATT&CK technique.
CAPEC-CAPEC-19 · Embedding Scripts within Scripts CAPEC-CAPEC-441 · Malicious Logic Insertion CAPEC-CAPEC-478 · Modification of Windows Service Configuration CAPEC-CAPEC-479 · Malicious Root Certificate CAPEC-CAPEC-502 · Intent Spoof CAPEC-CAPEC-503 · WebView Exposure CAPEC-CAPEC-536 · Data Injected During Configuration CAPEC-CAPEC-546 · Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-CAPEC-550 · Install New Service CAPEC-CAPEC-551 · Modify Existing Service CAPEC-CAPEC-552 · Install Rootkit CAPEC-CAPEC-556 · Replace File Extension Handlers
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Weakness Classification
CWE-284Improper Access Control
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Affected Products & Versions
18rockwellautomation 1756-enbtall versions
rockwellautomation 1756-eweball versions
rockwellautomation 1768-enbtall versions
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Scoring & Timeline
8.5
HIGH · CVSS v2 (legacy) · [email protected]
This CVE predates CVSS v3; the legacy v2 score is shown so triage still has a severity to work with.
v2 Vector
AV:N/AC:L/Au:N/C:N/I:P/A:C
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Vendor Advisories
1cisa-csafcisa-csaf-csaf_files-OT-white-2013-icsa-13-011-03
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References & Sources
5Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://www.us-cert.gov/control_systems/pdf/ICSA-13-011-03.pdfUS Government Resource