Vulnerability Monitor

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CVE-2021-31340

A vulnerability has been identified in SIMATIC RF166C (All versions > V1.1 and < V1.3.2), SIMATIC RF185C (All versions > V1.1 and < V1.3.2), SIMATIC RF186C (All versions > V1.1 and < V1.3.2), SIMATIC RF186CI (All versions > V1.1 and < V1.3.2), SIMATIC RF188C (All versions > V1.1 and < V1.3.2), SIMATIC RF188CI (All versions > V1.1 and < V1.3.2), SIMATIC RF360R (All versions < V2.0), SIMATIC Reader RF610R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF610R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF610R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF615R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF615R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF615R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF650R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF650R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF650R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF680R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF680R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF680R FCC (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ARIB (All versions > V3.0 < V4.0), SIMATIC Reader RF685R CMIIT (All versions > V3.0 < V4.0), SIMATIC Reader RF685R ETSI (All versions > V3.0 < V4.0), SIMATIC Reader RF685R FCC (All versions > V3.0 < V4.0). Affected devices do not properly handle large numbers of incoming connections. An attacker may leverage this to cause a Denial-of-Service situation.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 50 products from siemens, from siemens, from siemens and 47 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-06-08T20:15:08.853

Last Modified

2024-11-21T06:05:27.063

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-400
Type: Primary
CWE-400

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	siemens	simatic_rf166c_firmware	< 1.3.2	Yes
Hardware	siemens	simatic_rf166c	-	No
Operating System	siemens	simatic_rf185c_firmware	< 1.3.2	Yes
Hardware	siemens	simatic_rf185c	-	No
Operating System	siemens	simatic_rf186c_firmware	< 1.3.2	Yes
Hardware	siemens	simatic_rf186c	-	No
Operating System	siemens	simatic_rf186ci_firmware	< 1.3.2	Yes
Hardware	siemens	simatic_rf186ci	-	No
Operating System	siemens	simatic_rf188c_firmware	< 1.3.2	Yes
Hardware	siemens	simatic_rf188c	-	No
Operating System	siemens	simatic_rf188ci_firmware	< 1.3.2	Yes
Hardware	siemens	simatic_rf188ci	-	No
Operating System	siemens	simatic_rf360r_firmware	< 2.0	Yes
Hardware	siemens	simatic_rf360r	-	No
Operating System	siemens	simatic_reader_rf610r_cmiit_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf610r_cmiit	-	No
Operating System	siemens	simatic_reader_rf610r_etsi_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf610r_etsi	-	No
Operating System	siemens	simatic_reader_rf610r_fcc_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf610r_fcc	-	No
Operating System	siemens	simatic_reader_rf615r_cmiit_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf615r_cmiit	-	No
Operating System	siemens	simatic_reader_rf615r_etsi_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf615r_etsi	-	No
Operating System	siemens	simatic_reader_rf615r_fcc_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf615r_fcc	-	No
Operating System	siemens	simatic_reader_rf650r_cmiit_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf650r_cmiit	-	No
Operating System	siemens	simatic_reader_rf650r_etsi_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf650r_etsi	-	No
Operating System	siemens	simatic_reader_rf650r_fcc_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf650r_fcc	-	No
Operating System	siemens	simatic_reader_rf650r_arib_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf650r_arib	-	No
Operating System	siemens	simatic_reader_rf680r_cmiit_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf680r_cmiit	-	No
Operating System	siemens	simatic_reader_rf680r_etsi_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf680r_etsi	-	No
Operating System	siemens	simatic_reader_rf680r_fcc_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf680r_fcc	-	No
Operating System	siemens	simatic_reader_rf680r_arib_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf680r_arib	-	No
Operating System	siemens	simatic_reader_rf685r_cmiit_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf685r_cmiit	-	No
Operating System	siemens	simatic_reader_rf685r_etsi_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf685r_etsi	-	No
Operating System	siemens	simatic_reader_rf685r_fcc_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf685r_fcc	-	No
Operating System	siemens	simatic_reader_rf685r_arib_firmware	< 4.0	Yes
Hardware	siemens	simatic_reader_rf685r_arib	-	No

References

https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf Mitigation, Patch, Vendor Advisory ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-787292.pdf Mitigation, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For siemens's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.