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CVE-2021-27477· NVD / CVE Program· CNA icscert

When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, P

When JTEKT Corporation TOYOPUC PLC versions PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC10PE-16/16P, PC10E, FL/ET-T-V2H, PC10B,PC10B-P, Nano CPU, PC10P, and PC10GE receive an invalid frame, the outside area of a receive buffer for FL-net are overwritten. As a result, the PLC CPU detects a system error, and the affected products stop.

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Jul 1, 2021
Updated
Jun 16, 2026
EPSS
1.1% · 65th percentile
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Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

Affected systems

VendorProduct
jtektpc10g-cpu firmware
jtektpc10g-cpu
jtekt2port-efr firmware
jtekt2port-efr
jtektplus cpu firmware
jtektplus cpu
jtektplus ex firmware
jtektplus ex
jtektplus ex2 firmware
jtektplus ex2
jtektplus efr firmware
jtektplus efr

and 32 more

Affected versions

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

  • jtekt 2port-efr firmwarebefore 1.50
  • jtekt fl/et-t-v2h firmwarebefore f2.8_e1.5
  • jtekt nano 10gx firmwarebefore 3.00
  • jtekt nano 2et firmwarebefore 2.40
  • jtekt nano cpu firmwarebefore 2.08
  • jtekt pc10b firmwarebefore 1.11
  • jtekt pc10b-p firmwarebefore 1.11
  • jtekt pc10e firmwarebefore 1.02
  • jtekt pc10g-cpu firmwarebefore 3.91
  • jtekt pc10ge firmwarebefore 1.04
  • jtekt pc10p firmwarebefore 1.05
  • jtekt pc10p-dp firmwarebefore 1.50
  • jtekt pc10p-dp-io firmwarebefore 1.50
  • jtekt pc10pe firmwarebefore 1.02
  • jtekt pc10pe-16/16p firmwarebefore 1.02
  • jtekt plus 2p-efr firmwarebefore 3.11
  • jtekt plus bus-ex firmwarebefore 2.13
  • jtekt plus cpu firmwarebefore 3.11
  • jtekt plus efr firmwarebefore 3.11
  • jtekt plus efr2 firmwarebefore 3.11

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.

  • n/a JTEKT Corporation TOYOPUC PLC

    • The following versions of the PLC are affected: PC10G-CPU, 2PORT-EFR, Plus CPU, Plus EX, Plus EX2, Plus EFR, Plus EFR2, Plus 2P-EFR, PC10P-DP, PC10P-DP-IO, Plus BUS-EX, Nano 10GX, Nano 2ET,PC10PE, PC1affected

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.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

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-primary

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