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CVE-2012-6436· NVD / CVE Program· CNA icscert

Rockwell Automation ControlLogix PLC Improper Input Validation

The device does not properly validate the data being sent to the buffer. An attacker can send a malformed CIP packet to Port 2222/TCP, Port 2222/UDP, Port 44818/TCP, or Port 44818/UDP, which creates a buffer overflow and causes the CPU to crash. Successful exploitation of this vulnerability could cause loss of availability and a disruption in communications 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

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Jan 24, 2013
Updated
Jun 16, 2026
EPSS
27.1% · 98th percentile
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Action score

38

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
8 / 30 · 27.1%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · icscert
7.8
NVD has not scored this yet; the score shown is the CNA’s.

AV:N/AC:L/Au:N/C:N/I:N/A:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
rockwellautomationcontrollogix controllers
rockwellautomationguardlogix controllers
rockwellautomationmicrologix
rockwellautomationsoftlogix controllers
rockwellautomation1756-enbt
rockwellautomation1756-eweb
rockwellautomation1768-enbt
rockwellautomation1768-eweb
rockwellautomation1794-aentr flex i\/o ethernet\/ip adapter
rockwellautomationcompactlogix
rockwellautomationcompactlogix controllers
rockwellautomationcompactlogix l32e controller

and 5 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • rockwellautomation 1756-enbtall versions
  • rockwellautomation 1756-eweball versions
  • rockwellautomation 1768-enbtall versions
  • rockwellautomation 1768-eweball versions
  • rockwellautomation 1794-aentr flex i/o ethernet/ip adapterall versions
  • rockwellautomation compactlogixup to 18 inclusive
  • rockwellautomation compactlogix controllersup to 19 inclusive
  • rockwellautomation compactlogix l32e controllerall versions
  • rockwellautomation compactlogix l35e controllerall versions
  • rockwellautomation controllogixup to 18 inclusive
  • rockwellautomation controllogix controllersup to 20 inclusive
  • rockwellautomation flexlogix 1788-enbt adapterall versions
  • rockwellautomation guardlogixup to 18 inclusive
  • rockwellautomation guardlogix controllersup to 20 inclusive
  • rockwellautomation micrologixup to 1100 inclusive
  • rockwellautomation micrologixup to 1400 inclusive
  • rockwellautomation softlogixup to 18 inclusive
  • rockwellautomation softlogix controllersup to 19 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (icscert). Independent of NVD's CPE analysis and usually ahead of it.

  • Rockwell Automation 1756-ENBT, 1756-EWEB, 1768-ENBT, 1768-EWEB communication modules

    • Allaffected

  • Rockwell Automation 1788-ENBT FLEXLogix adapter

    • Allaffected

  • Rockwell Automation 1794-AENTR FLEX I/O EtherNet/IP adapter

    • Allaffected

  • Rockwell Automation CompactLogix and SoftLogix controllers

    • up to and including 19affected

  • Rockwell Automation CompactLogix L32E and L35E controllers

    • Allaffected

  • Rockwell Automation ControlLogix and GuardLogix controllers

    • up to and including 20affected

  • Rockwell Automation ControlLogix, CompactLogix, GuardLogix, and SoftLogix

    • up to and including 18affected

  • Rockwell Automation MicroLogix

    • 1100, 1400affected

Same product

rockwellautomation: all records

Other highest-scoring records for the same primary product.

  • CVE-2012-6439Rockwell Automation ControlLogix PLC Improper Access Control
    41Plan
  • CVE-2012-6437Rockwell Automation ControlLogix PLC Improper Authentication
    41Plan
  • CVE-2012-6435Rockwell Automation ControlLogix PLC Improper Access Control
    40Plan
  • CVE-2012-6438Rockwell Automation ControlLogix PLC Improper Input Validation
    38Monitor
  • CVE-2012-6441Rockwell Automation ControlLogix PLC Information Exposure
    37Monitor
  • CVE-2012-6440Rockwell Automation ControlLogix PLC Improper Input Validation
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records