ETSI EN 304 621 V1.0.5 (2026-08)

Draft ETSI EN 304 621 V1.0.5 (2026-08)

HARMONISED EUROPEAN STANDARD
Cyber Security (CYBER);
CRA;
Cybersecurity requirements for Network Management systems

2 Draft ETSI EN 304 621 V1.0.5 (2026-08)

Reference
DEN/CYBER-EUS-009
Keywords
CRA, cybersecurity, network management

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ETSI
3 Draft ETSI EN 304 621 V1.0.5 (2026-08)
Contents
Intellectual Property Rights . 10
Foreword . 10
Modal verbs terminology . 11
Introduction . 11
1 Scope . 12
2 References . 12
2.1 Normative references . 12
2.2 Informative references . 13
3 Definition of terms, symbols and abbreviations . 14
3.1 Terms . 14
3.2 Symbols . 15
3.3 Abbreviations . 15
4 Product context . 17
4.0 Introduction . 17
4.1 Product Functions . 17
4.1.0 Introduction. 17
4.1.1 Network functions management . 17
4.1.2 Software defined network management . 18
4.1.3 Ecosystem management . 18
4.1.4 ICT device management . 19
4.2 Product Architecture. 19
4.2.0 Introduction. 19
4.2.1 Network architecture. 20
4.2.1.1 Software Defined Network . 21
4.2.1.2 Application in a SDN . 22
4.2.1.3 Pocket deployment . 22
4.2.1.4 Devices using provided connectivity . 23
4.2.2 Controller design . 23
4.2.3 Applying encryption in IETF RFC 1122 . 24
4.2.4 Inventory, device and subjects management . 24
4.2.4.1 Identifying privileged subjects . 24
4.2.4.2 Device management . 24
4.2.4.3 Inventory management . 25
4.3 Operational Environment . 25
4.3.1 General description . 25
4.3.2 Physical/Hardware environment . 25
4.3.3 Logical/Software environment. 26
4.3.4 Connectivity aspects . 27
4.3.4.0 Introduction . 27
4.3.4.1 Identity management . 27
4.3.4.2 Attribute-Based Access Control . 27
4.3.4.3 Role based authorisation . 28
4.3.4.4 Trust initialisation . 28
4.3.4.5 Risk management . 28
4.4 Distribution of Security Functions . 29
4.4.0 Introduction. 29
4.4.1 Ancillary functionality . 29
4.4.2 Related core functionalities. 29
4.4.3 Security functions provided to other products . 30
4.5 Users . 30
4.6 Use Cases . 30
4.6.0 Introduction. 30
4.6.1 UC-1-HOME: Home NMS . 31
4.6.2 UC-2-ENTER-*: Enterprise network. 32
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4 Draft ETSI EN 304 621 V1.0.5 (2026-08)
4.6.3 UC-3-TELCO: Telecommunications network . 34
4.6.4 UC-4-SDN: Logical network deployment without physical hardware . 35
4.6.5 UC-5-HYBRID: Physical network deployment with RDPS . 36
4.6.6 UC-6-IOT: IoT network with monitoring data collection . 39
4.6.7 UC-7-ICT: ICT Network Elements . 40
4.6.8 UC-8-FLEET: Fleet management . 42
4.6.9 UC-9-RESEARCH: Research NMS . 43
4.6.10 UC-10-AIRGAP: Airgapped secure facility . 43
4.6.11 UC-11-WATER: Management of distributed infrastructure . 44
5 Technical requirements for products . 44
5.1 Introduction - Applicability of the requirements . 44
5.2 Appropriate level of cybersecurity . 46
5.3 No known exploitable vulnerabilities . 47
5.4 Secure by default configuration . 47
5.5 Security updates . 48
5.6 Authentication and access control . 49
5.7 Confidentiality protection . 50
5.8 Integrity protection . 51
5.9 Data minimisation . 51
5.10 Availability protection . 52
5.11 Non-interference . 52
5.12 Attack surface minimisation . 53
5.13 Exploit mitigation . 53
5.14 Monitoring . 54
5.15 Factory reset and data portability . 56
6 Assessment criteria for compliance with technical requirements . 56
6.1 Introduction to the assessment and compliance criteria . 56
6.1.0 Assessment guide . 56
6.2 Appropriate level of cybersecurity . 58
6.2.1 CYB_GENERAL-1 . 58
6.2.2 CYB_GENERAL-2 . 58
6.2.3 CYB_GENERAL-3 . 59
6.2.4 CYB_GENERAL-4 . 59
6.2.5 CYB_GENERAL-5 . 60
6.2.6 CYB_GENERAL-6 . 60
6.2.7 CYB_GENERAL-7 . 61
6.2.8 CYB_OPS-8 . 61
6.2.9 CYB_OPS-9 . 62
6.2.10 CYB_OPS-10 . 62
6.3 No known exploitable vulnerabilities . 62
6.3.1 KEV_EXPLOIT-1 . 62
6.4 Secure by default configuration . 64
6.4.1 SBD_TECH-1 . 64
6.4.2 SBD_TECH-2 . 64
6.4.3 SBD_TECH-3 . 65
6.5 Security updates . 65
6.5.1 SU_UPDATES-1 . 65
6.5.2 SU_UPDATES-2 . 66
6.5.3 SU_UPDATES-3 . 66
6.5.4 SU_UPDATES-4 . 67
6.5.5 SU_UPDATES-5 . 67
6.5.6 SU_UPDATES-6 . 68
6.5.7 SU_UPDATES-7 . 68
6.5.8 SU_UPDATES-8 . 69
6.5.9 SU_UPDATES-9 . 69
6.5.10 SU_UPDATES-10 . 70
6.5.11 SU_UPDATES-11 . 70
6.5.12 SU_UPDATES-12 . 71
6.5.13 SU_UPDATES-13 . 71
6.5.14 SU_UPDATES-14 . 72
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5 Draft ETSI EN 304 621 V1.0.5 (2026-08)
6.5.15 SU_UPDATES-15 . 72
6.6 Authentication and access control . 73
6.6.1 AAC_AUTH-1 . 73
6.6.2 AAC_AUTH-2 . 73
6.6.3 AAC_AUTH-3 . 74
6.6.4 AAC_AUTH-4 . 74
6.6.5 AAC_AUTH-5 . 75
6.6.6 AAC_AUTH-6 . 76
6.6.7 AAC_AUTH-7 . 76
6.6.8 AAC_AUTH-8 . 77
6.6.9 AAC_AUTH-9 . 77
6.6.10 AAC_AUTH-10 . 78
6.6.11 AAC_AUTH-11 . 78
6.6.12 AAC_AUTH-12 . 79
6.6.13 AAC_MACHINE-13 . 80
6.6.14 AAC_MACHINE-14 . 80
6.7 Confidentiality protection . 81
6.7.1 CON_INGEST-1 . 81
6.7.2 CON_INGEST-2 . 81
6.7.3 CON_CRYPTO-3 . 82
6.7.4 CON_CHANNEL-4. 82
6.7.5 CON_CHANNEL-5. 83
6.8 Integrity protection . 83
6.8.1 INT_CONF-1 . 83
6.8.2 INT_CONF-2 . 84
6.8.3 INT_CONF-3 . 84
6.8.4 INT_ROTATE-4 . 85
6.8.5 INT_ROTATE-5 . 85
6.8.6 INT_ROTATE-6 . 86
6.9 Data minimisation . 86
6.9.1 DM_RETENTION-1 . 86
6.9.2 DM_RETENTION-2 . 87
6.9.3 DM_RETENTION-3 . 87
6.10 Availability protection . 88
6.10.1 AP_HA-1 . 88
6.10.2 AP_HA-2 . 88
6.10.3 AP_HA-3 . 89
6.10.4 AP_HA-4 . 89
6.10.5 AP_HA-5 . 90
6.10.6 AP_HA-6 . 90
6.10.7 AP_HA-7 . 91
6.11 Non-interference . 92
6.11.1 IM_SEGMENT-1 . 92
6.11.2 IM_SEGMENT-2 . 92
6.11.3 IM_SEGMENT-3 . 93
6.12 Attack surface minimisation . 94
6.12.1 MAS_TECH-1 . 94
6.12.2 MAS_TECH-2 . 94
6.13 Exploit mitigation . 95
6.13.1 EMM_ROUTE-1 . 95
6.13.2 EMM_ROUTE-2 . 95
6.13.3 EMM_ROUTE-3 . 96
6.14 Monitoring . 96
6.14.0 Logging tests . 96
6.14.1 MON_LOG-1 . 96
6.14.2 MON_LOG-2 . 97
6.14.3 MON_LOG-3 . 97
6.14.4 MON_LOG-4 . 98
6.14.5 MON_LOG-5 . 98
6.14.6 MON_LOG-6 . 99
6.14.7 MON_LOG-7 . 100
6.14.8 MON_LOG-8 . 100
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6.14.9 MON_LOG-9 . 101
6.14.10 MON_LOG-10 . 101
6.14.11 MON_LOG-11 . 102
6.14.12 MON_LOG-12 . 102
6.14.13 MON_LOG-13 . 103
6.14.14 MON_METRICS-14 . 103
6.14.15 MON_METRICS-15 . 103
6.14.16 MON_METRICS-16 . 104
6.14.17 MON_METRICS-17 . 104
6.15 Factory reset and data portability . 106
6.15.1 DRT_DELETE-1 . 106
6.15.2 DRT_DELETE-2 . 107
Annex A (informative): Relationship between the present document and the essential
cybersecurity requirements of EU Regulation (EU) 2024/2847 . 108
Annex B (informative): Security analysis . 112
B.0 Overview . 112
B.1 Assets . 112
B.1.1 Data . 112
B.1.2 Hardware . 113
B.1.3 Product and managed element functions . 113
B.2 Risk factors . 113
B.2.1 Overview . 113
B.2.2 RF-ACC_ASSETS: Accessibility of network connected to product assets . 113
B.2.3 RF-COMPLEX_CONF: Complexity of network configuration. 113
B.2.4 RF-COMPLEX_FUN: Complexity of product functions . 114
B.2.5 RF-SENS_ASSETS: Sensitivity of managed assets . 114
B.2.6 RF-SENS_FUN: Sensitivity of functions of product . 114
B.2.7 RF-NUM: Number of managed elements . 115
B.2.8 RF-ADMIN: Availability and skill of administration . 115
B.3 Assumptions . 115
B.4 Mapping of risk factors to use cases . 115
B.4.1 UC-1-HOME security analysis . 116
B.4.2 UC-2-ENTER security analysis . 116
B.4.3 UC-3-TELCO security analysis . 117
B.4.4 UC-4-SDN security analysis . 117
B.4.5 UC-5-HYBRID security analysis . 117
B.4.6 UC-6-IOT security analysis . 117
B.4.7 UC-7-ICT security analysis . 118
B.4.8 UC-8-FLEET security analysis . 119
B.4.9 UC-9-RESEARCH security analysis . 119
B.4.10 UC-10-AIRGAP security analysis . 119
B.4.11 UC-11-WATER security analysis . 119
B.5 Threats and security analysis of threats . 119
B.5.1 Security analysis methodology . 119
B.5.2 List of threats, risk assessments, and mitigations . 120
B.5.2.0 Introduction. 120
B.5.2.1 TH-UEVU: Unknown exploitable vulnerabilities . 120
B.5.2.2 TH-KEVU: Known exploitable vulnerabilities . 121
B.5.2.3 TH-CACC: Circumvention of access control . 123
B.5.2.4 TH-DSTP: Unauthorised access to data stored . 124
B.5.2.5 TH-UADT: Unauthorised access to data transmitted . 125
B.5.2.6 TH-CONF: Access to assets via configuration errors . 126
B.5.2.7 TH-AVAI: Denial of service attack on product . 127
B.5.2.8 TH-DDoS: Interference with other devices . 129
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7 Draft ETSI EN 304 621 V1.0.5 (2026-08)
Annex C (informative): Relationship between the present document and any related ETSI
standards . 131
Annexes D to F: Void . 132
Annex G (informative): Guidelines on the implementation of the present document . 133
G.0 Guidance on use-cases . 133
G.1 Guidance on no known exploitable vulnerabilities requirements . 133
G.2 Guidance on secure by default configuration requirements . 133
G.3 Guidance on authentication and access control requirements . 134
G.4 Guidance on confidentiality protection requirements . 134
G.5 Guidance on integrity protection requirements . 135
G.6 Guidance on availability protection requirements . 135
G.7 Guidance on non-interference requirements . 135
G.8 Guidance on exploit mitigation requirements . 136
G.9 Guidance on exploit mitigation requirements . 136
G.10 Guidance on monitoring requirements . 136
Annexes H to J: Void . 137
Annex K (normative): Generic cryptographic requirements and assessment . 138
K.1 Cryptography . 138
K.1.1 Requirement . 138
K.1.2 Assessment of product cryptographic configuration . 139
K.1.2.0 General . 139
K.1.2.1 Assessment of ACM-listed cryptographic mechanisms. 139
K.1.2.1.1 Assessment objective . 139
K.1.2.1.2 Assessment preparation . 139
K.1.2.1.3 Assessment activities . 139
K.1.2.1.4 Assessment evidence . 140
K.1.2.1.5 Assessment verdict . 140
K.1.2.2 Assessment of ACM-extended cryptographic mechanisms . 140
K.1.2.2.1 Assessment objective . 140
K.1.2.2.2 Assessment preparation . 140
K.1.2.2.3 Assessment activities .
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