CVE-2026-75945 (GCVE-0-2026-75945)
Vulnerability from cvelistv5 – Published: 2026-09-14 22:23 – Updated: 2026-09-14 23:05
VLAI
EPSS
VEX
Title
A race condition may cause a supplicant to remain in an authorized state after a clear dot1x host all command is issued.
Summary
A race condition may cause a supplicant to remain in an authorized state after a clear dot1x host all command is issued.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-14 23:05 UTC
CWE
- CWE-459 - Incomplete Cleanup
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Arista Networks | EOS |
Affected:
4.36.0 , ≤ 4.36.1F
(custom)
|
guessed |
Date Public
2026-09-09 22:20
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"value": "\u003cpre\u003e\u003cp\u003eIn order to be vulnerable to any of the vulnerabilities, the following condition must be met under interface configuration mode:\u003c/p\u003e\u003col\u003e\u003cli\u003e802.1X (dot1x in the CLI) must be configured with \u003cb\u003epae authenticator\u003c/b\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003c/li\u003e\u003cli\u003eport-control must be set to auto mode\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003c/li\u003e\u003cli\u003eA static or dynamic ACL must be configured.\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003c/li\u003e\u003cli\u003eThe RADIUS Access-Accept or Change-of-Authorization (CoA) assigns an ACL to that supplicant using RADIUS AVP (Attribute-Value pair) Filter-Id or NAS-Filter-Rule\u003c/li\u003e\u003c/ol\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eBelow is an example of one configuration. Note that \u201cmac based authentication always\u201d is optional The supplicant can authenticate with either EAPOL or MBA.\u003c/p\u003e\u003cpre\u003eswitch(config-if-et1)#show active\n \ninterface Ethernet5\n\u0026nbsp;\u0026nbsp;\u0026nbsp;switchport mode trunk\n\u0026nbsp;\u0026nbsp;\u0026nbsp;spanning-tree portfast edge\n dot1x pae authenticator\n\u0026nbsp;\u0026nbsp;\u0026nbsp;dot1x port-control auto\n \ndot1x system-auth-control\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIn this example port control is in \u201cauto\u201d mode, necessary for the condition to occur.\u003c/p\u003e\u003cpre\u003econfig)#show\u0026nbsp; dot1x\u0026nbsp; interface\u0026nbsp; ethernet 5 details\nDot1X Information for Ethernet5\n--------------------------------------------\nPort control: auto\nForced phone authorization: disabled\nEAPOL: enabled\nHost mode: multi-host\nMAC-based authentication: enabled\nMAC-based authentication host mode: Unconfigured\nMAC-based authentication always: enabled\nQuiet period: 60 seconds\nTX period: 5 seconds\nMaximum reauth requests: 2\nIgnore reauth timeout: No\nAuth failure VLAN: Unconfigured\nUnauthorized access VLAN egress: No\nUnauthorized native VLAN egress: No\nEAPOL authentication failure fallback: Unconfigured\nPort ErrDisabled by CoA: no\n \nDot1X Authenticator Client\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003e\u0026nbsp; Use a preconfigured ACL with which the RADIUS server returns in the \u003cb\u003eFilter-Id\u003c/b\u003e AVP\u003c/p\u003e\u003cpre\u003eswitch(config)#ip access-list EMPLOYEE-ACL\nswitch(config-ip-acl-EMPLOYEE-ACL)#10 permit ip 10.0.0.0/8 any\nswitch(config-ip-acl-EMPLOYEE-ACL)#20 deny ip any any\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eAAA server will return the ACL name through \u003cb\u003eFilter-Id\u003c/b\u003e AVP through Access-Accept or CoA messages , in the above sample , Filter-Id AVP with EMPLOYEE-ACL will be received from the server.\u003c/p\u003e\u003cp\u003eTo verify the configured ACL, execute the following show command to identify the ACL applied to the interface:\u003c/p\u003e\u003cpre\u003eswitch(config)#show ip access-lists interface Ethernet5 summary\u0026nbsp;\nIP Access List EMPLOYEE-ACL\n\u0026nbsp;\u0026nbsp;\u0026nbsp;10 permit ip 10.0.0.0/8 any\n\u0026nbsp;\u0026nbsp;\u0026nbsp;20 deny ip any any\n \n\u0026nbsp;\u0026nbsp;\u0026nbsp;Total rules configured: 2\n\u0026nbsp;\u0026nbsp;\u0026nbsp;Configured on Ingress: Ethernet5\n\u0026nbsp;\u0026nbsp;\u0026nbsp;Active on Ingress: Ethernet5\u0026nbsp;\n\u003c/pre\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cp\u003eIn addition to the prerequisite above to configure 802.1X in authenticator mode with ACL-based authorization, the supplicant(s) must be removed via the below command:\u003c/p\u003e\u003cpre\u003eswitch(config-dot1x)#clear dot1x host all\u003c/pre\u003e\u003c/pre\u003e"
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"value": "\u003cpre\u003e\u003cp\u003eIn order to be vulnerable to any of the vulnerabilities, the following condition must be met under interface configuration mode:\u003c/p\u003e\u003col\u003e\u003cli\u003e802.1X (dot1x in the CLI) must be configured with \u003cb\u003epae authenticator\u003c/b\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003c/li\u003e\u003cli\u003eport-control must be set to auto mode\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003c/li\u003e\u003cli\u003eA static or dynamic ACL must be configured.\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003c/li\u003e\u003cli\u003eThe RADIUS Access-Accept or Change-of-Authorization (CoA) assigns an ACL to that supplicant using RADIUS AVP (Attribute-Value pair) Filter-Id or NAS-Filter-Rule\u003c/li\u003e\u003c/ol\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eBelow is an example of one configuration. Note that \u201cmac based authentication always\u201d is optional The supplicant can authenticate with either EAPOL or MBA.\u003c/p\u003e\u003cpre\u003eswitch(config-if-et1)#show active\n \ninterface Ethernet5\n\u0026nbsp;\u0026nbsp;\u0026nbsp;switchport mode trunk\n\u0026nbsp;\u0026nbsp;\u0026nbsp;spanning-tree portfast edge\n dot1x pae authenticator\n\u0026nbsp;\u0026nbsp;\u0026nbsp;dot1x port-control auto\n \ndot1x system-auth-control\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eIn this example port control is in \u201cauto\u201d mode, necessary for the condition to occur.\u003c/p\u003e\u003cpre\u003econfig)#show\u0026nbsp; dot1x\u0026nbsp; interface\u0026nbsp; ethernet 5 details\nDot1X Information for Ethernet5\n--------------------------------------------\nPort control: auto\nForced phone authorization: disabled\nEAPOL: enabled\nHost mode: multi-host\nMAC-based authentication: enabled\nMAC-based authentication host mode: Unconfigured\nMAC-based authentication always: enabled\nQuiet period: 60 seconds\nTX period: 5 seconds\nMaximum reauth requests: 2\nIgnore reauth timeout: No\nAuth failure VLAN: Unconfigured\nUnauthorized access VLAN egress: No\nUnauthorized native VLAN egress: No\nEAPOL authentication failure fallback: Unconfigured\nPort ErrDisabled by CoA: no\n \nDot1X Authenticator Client\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003e\u0026nbsp; Use a preconfigured ACL with which the RADIUS server returns in the \u003cb\u003eFilter-Id\u003c/b\u003e AVP\u003c/p\u003e\u003cpre\u003eswitch(config)#ip access-list EMPLOYEE-ACL\nswitch(config-ip-acl-EMPLOYEE-ACL)#10 permit ip 10.0.0.0/8 any\nswitch(config-ip-acl-EMPLOYEE-ACL)#20 deny ip any any\n\u003c/pre\u003e\u003cdiv\u003e\u0026nbsp;\u003c/div\u003e\u003cp\u003eAAA server will return the ACL name through \u003cb\u003eFilter-Id\u003c/b\u003e AVP through Access-Accept or CoA messages , in the above sample , Filter-Id AVP with EMPLOYEE-ACL will be received from the server.\u003c/p\u003e\u003cp\u003eTo verify the configured ACL, execute the following show command to identify the ACL applied to the interface:\u003c/p\u003e\u003cpre\u003eswitch(config)#show ip access-lists interface Ethernet5 summary\u0026nbsp;\nIP Access List EMPLOYEE-ACL\n\u0026nbsp;\u0026nbsp;\u0026nbsp;10 permit ip 10.0.0.0/8 any\n\u0026nbsp;\u0026nbsp;\u0026nbsp;20 deny ip any any\n \n\u0026nbsp;\u0026nbsp;\u0026nbsp;Total rules configured: 2\n\u0026nbsp;\u0026nbsp;\u0026nbsp;Configured on Ingress: Ethernet5\n\u0026nbsp;\u0026nbsp;\u0026nbsp;Active on Ingress: Ethernet5\u0026nbsp;\n\u003c/pre\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cp\u003eIn addition to the prerequisite above to configure 802.1X in authenticator mode with ACL-based authorization, the supplicant(s) must be removed via the below command:\u003c/p\u003e\u003cpre\u003eswitch(config-dot1x)#clear dot1x host all\u003c/pre\u003e\u003c/pre\u003e"
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],
"value": "In order to be vulnerable to any of the vulnerabilities, the following condition must be met under interface configuration mode:\n\n * 802.1X (dot1x in the CLI) must be configured with pae authenticator\u00a0\n\n\n * port-control must be set to auto mode\u00a0\n\n\n * A static or dynamic ACL must be configured.\u00a0\n\n\n * The RADIUS Access-Accept or Change-of-Authorization (CoA) assigns an ACL to that supplicant using RADIUS AVP (Attribute-Value pair) Filter-Id or NAS-Filter-Rule\n\u00a0\n\n\n\nBelow is an example of one configuration. Note that \u201cmac based authentication always\u201d is optional The supplicant can authenticate with either EAPOL or MBA.\n\n\n\nswitch(config-if-et1)#show active\n \ninterface Ethernet5\n\u00a0\u00a0\u00a0switchport mode trunk\n\u00a0\u00a0\u00a0spanning-tree portfast edge\n dot1x pae authenticator\n\u00a0\u00a0\u00a0dot1x port-control auto\n \ndot1x system-auth-control\n\n\n\u00a0\n\n\n\nIn this example port control is in \u201cauto\u201d mode, necessary for the condition to occur.\n\n\n\nconfig)#show\u00a0 dot1x\u00a0 interface\u00a0 ethernet 5 details\nDot1X Information for Ethernet5\n--------------------------------------------\nPort control: auto\nForced phone authorization: disabled\nEAPOL: enabled\nHost mode: multi-host\nMAC-based authentication: enabled\nMAC-based authentication host mode: Unconfigured\nMAC-based authentication always: enabled\nQuiet period: 60 seconds\nTX period: 5 seconds\nMaximum reauth requests: 2\nIgnore reauth timeout: No\nAuth failure VLAN: Unconfigured\nUnauthorized access VLAN egress: No\nUnauthorized native VLAN egress: No\nEAPOL authentication failure fallback: Unconfigured\nPort ErrDisabled by CoA: no\n \nDot1X Authenticator Client\n\n\n\u00a0\n\n\n\n\u00a0 Use a preconfigured ACL with which the RADIUS server returns in the Filter-Id AVP\n\n\n\nswitch(config)#ip access-list EMPLOYEE-ACL\nswitch(config-ip-acl-EMPLOYEE-ACL)#10 permit ip 10.0.0.0/8 any\nswitch(config-ip-acl-EMPLOYEE-ACL)#20 deny ip any any\n\n\n\u00a0\n\n\n\nAAA server will return the ACL name through Filter-Id AVP through Access-Accept or CoA messages , in the above sample , Filter-Id AVP with EMPLOYEE-ACL will be received from the server.\n\n\n\nTo verify the configured ACL, execute the following show command to identify the ACL applied to the interface:\n\n\n\nswitch(config)#show ip access-lists interface Ethernet5 summary\u00a0\nIP Access List EMPLOYEE-ACL\n\u00a0\u00a0\u00a010 permit ip 10.0.0.0/8 any\n\u00a0\u00a0\u00a020 deny ip any any\n \n\u00a0\u00a0\u00a0Total rules configured: 2\n\u00a0\u00a0\u00a0Configured on Ingress: Ethernet5\n\u00a0\u00a0\u00a0Active on Ingress: Ethernet5\u00a0\n\n\n\n\n\n\n\nIn addition to the prerequisite above to configure 802.1X in authenticator mode with ACL-based authorization, the supplicant(s) must be removed via the below command:\n\n\n\nswitch(config-dot1x)#clear dot1x host all"
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"value": "Those issues were discovered internally by Arista, and the company is not aware of any malicious exploitation of these vulnerabilities in customer networks."
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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