CVE-2026-73463 (GCVE-0-2026-73463)
Vulnerability from cvelistv5 – Published: 2026-09-16 09:02 – Updated: 2026-09-16 13:59
VLAI
EPSS
VEX
Title
Security Advisory 0169
Summary
On affected platforms running Arista EOS, when multiple gRPC Network Security Interface (gNSI) transports are configured, a race condition in the gNSI Authz service may cause a policy rotation to fail silently. An authenticated user whose access was revoked by the new policy may retain unauthorized access to gRPC interfaces. This does not affect Bootz.
This issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 13:59 UTC
CWE
- CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.arista.com/en/support/advisories-noti… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Arista Networks | EOS |
Affected:
4.36.0F , ≤ 4.36.0.1F
(custom)
Affected: 4.35.0F , ≤ 4.35.5M (custom) Affected: 4.34.0F , ≤ 4.34.7M (custom) Affected: 4.33.0F , ≤ 4.33.8M (custom) Affected: 4.32.0F , ≤ 4.32.11M (custom) Affected: 4.31.0F , ≤ 4.31.10M (custom) |
guessed |
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"baseScore": 6,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-362",
"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-16T10:13:37.649Z",
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista"
},
"references": [
{
"name": "Security Advisory 0169",
"tags": [
"vendor-advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24725-security-advisory-0169"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\u003c/p\u003e\u003cp\u003eCVE-2026-73463 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.1F and later releases in the 4.36.x train\u003c/li\u003e\u003cli\u003e4.35.6M and later releases in the 4.35.x train\u003c/li\u003e\u003cli\u003e4.34.7.1M and later releases in the 4.34.x train\u003c/li\u003e\u003cli\u003e4.33.9M and later releases in the 4.33.x train\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eNo hotfix is available for this issue.\u003c/p\u003e"
}
],
"value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. Arista recommends customers move to the latest version of each release that contains all the fixes listed below.\n\nCVE-2026-73463 has been fixed in the following releases:\n- 4.36.1F and later releases in the 4.36.x train\n- 4.35.6M and later releases in the 4.35.x train\n- 4.34.7.1M and later releases in the 4.34.x train\n- 4.33.9M and later releases in the 4.33.x train\n\nNo hotfix is available for this issue."
}
],
"source": {
"advisory": "Security Advisory 0169",
"defects": [
"BUG 1602636"
],
"discovery": "INTERNAL"
},
"title": "Security Advisory 0169",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eRestrict the set of users that can enable gNSI on OpenConfig / Octa transports via the CLI.\u003c/p\u003e\u003cp\u003eFirstly, configure AAA authorization. The following is an example of configuring AAA authorization for all privilege levels using only the local user database:\u003c/p\u003e\u003cpre\u003eswitch(config)#aaa authorization commands all default local\nswitch(config)#aaa authorization config-commands\u003c/pre\u003e\u003cp\u003eNow restrict a sufficient subset of all roles from enabling gNSI services. In the below example, we prohibit just network-operators:\u003c/p\u003e\u003cpre\u003eswitch(config-mgmt-api-gnsi)#role network-operator\nswitch(config-role-network-operator)#10 deny mode mgmt-api-gnsi command transport gnmi .*\n256 permit command .*\u003c/pre\u003e"
}
],
"value": "Restrict the set of users that can enable gNSI on OpenConfig / Octa transports via the CLI.\n\nFirstly, configure AAA authorization. The following is an example of configuring AAA authorization for all privilege levels using only the local user database:\n\n switch(config)#aaa authorization commands all default local\n switch(config)#aaa authorization config-commands\n\nNow restrict a sufficient subset of all roles from enabling gNSI services. In the below example, we prohibit just network-operators:\n\n switch(config-mgmt-api-gnsi)#role network-operator\n switch(config-role-network-operator)#10 deny mode mgmt-api-gnsi command transport gnmi .*\n 256 permit command .*"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"assignerShortName": "Arista",
"cveId": "CVE-2026-73463",
"datePublished": "2026-09-16T09:02:19.908Z",
"dateReserved": "2026-08-12T16:45:03.511Z",
"dateUpdated": "2026-09-16T13:59:32.239Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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