Vulnerability Details : CVE-2021-27477
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.
Vulnerability category: OverflowMemory Corruption
Products affected by CVE-2021-27477
- cpe:2.3:o:jtekt:pc10g-cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:2port-efr_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_ex_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_ex2_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_efr_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_efr2_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_2p-efr_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10p-dp_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10p-dp-io_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:plus_bus-ex_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:nano_10gx_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:nano_2et_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10pe_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10pe-16\/16p_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10e_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:fl\/et-t-v2h_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10b_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10b-p_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:nano_cpu_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10p_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:jtekt:pc10ge_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27477
0.12%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 47 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27477
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
7.8
|
HIGH | AV:N/AC:L/Au:N/C:N/I:N/A:C |
10.0
|
6.9
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-27477
-
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.Assigned by: ics-cert@hq.dhs.gov (Secondary)
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-27477
-
https://us-cert.cisa.gov/ics/advisories/icsa-21-180-04
JTEKT TOYOPUC PLC | CISAThird Party Advisory;US Government Resource
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