CVE-2026-73445 (GCVE-0-2026-73445)
Vulnerability from cvelistv5 – Published: 2026-09-16 08:58 – Updated: 2026-09-16 17:35
VLAI
EPSS
VEX
Title
Security Advisory 0167
Summary
On affected platforms running Arista EOS, an issue with the gRPC Network Security Interface (gNSI) Authz Rotate RPC may cause an incorrect Authz policy which was uploaded in the ongoing RPC stream to become active. This does not affect Bootz.
This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.
Severity
4.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 17:35 UTC
CWE
- CWE-20 - Improper Input Validation
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 , < 4.33.0F (custom) Affected: 4.31.0F , < 4.32.0F (custom) |
guessed |
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"value": "\u003cp\u003eOn affected platforms running Arista EOS, an issue with the gRPC Network Security Interface (gNSI) Authz Rotate RPC may cause an incorrect Authz policy which was uploaded in the ongoing RPC stream to become active. This does not affect Bootz.\u003c/p\u003e\u003cp\u003eThis issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.\u003c/p\u003e"
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"value": "\u003cp\u003e1. Include exactly one UploadRequest in a gNSI Authz Rotate request.\u003c/p\u003e\u003cp\u003e2. Use a gNSI Authz policy that restricts gNSI Authz use to only those who strictly need it. Below is an example policy that only allows user \u0026quot;Neo\u0026quot; to rotate Authz policies:\u003c/p\u003e\u003cpre\u003e{\n \"name\":\"restrict-authz-policy\",\n \"allow_rules\":[\n {\n \"name\":\"neoallow\",\n \"request\":{\n \"paths\":[\n \"/gnsi.authz.v1.Authz/Rotate\"\n ],\n \"headers\":[\n {\n \"key\":\"username\",\n \"values\":[\n \"Neo\"\n ]\n }\n ]\n }\n },\n {\n \"name\":\"allow-gnmi\",\n \"request\":{\n \"paths\":[\n \"/gnmi.gNMI/*\"\n ]\n }\n },\n {\n \"name\":\"allow-gnoi\",\n \"request\":{\n \"paths\":[\n \"/gnoi.*\"\n ]\n }\n }\n ]\n}\u003c/pre\u003e\u003cp\u003eIdeally, this policy would be uploaded via a gNSI client for correct version and created-on metadata handling. However, the policy can also be written directly to the active policy file:\u003c/p\u003e\u003cpre\u003eswitch#bash timeout 100 echo \"{\\\"name\\\":\\\"restrict-authz-policy\\\",\\\"allow_rules\\\":[{\\\"name\\\":\\\"neoallow\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnsi.authz.v1.Authz\\/Rotate\\\"],\\\"headers\\\":[{\\\"key\\\":\\\"username\\\",\\\"values\\\":[\\\"Neo\\\"]}]}},{\\\"name\\\":\\\"allow-gnmi\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnmi.gNMI\\/*\\\"]}},{\\\"name\\\":\\\"allow-gnoi\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnoi.*\\\"]}}]}\" | sudo tee /persist/sys/gnsi/authz/policy.json \u0026amp;\u0026amp; sleep 11\u003c/pre\u003e"
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}
],
"value": "On affected platforms running Arista EOS, an issue with the gRPC Network Security Interface (gNSI) Authz Rotate RPC may cause an incorrect Authz policy which was uploaded in the ongoing RPC stream to become active. This does not affect Bootz.\n\nThis issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 4.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/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-20",
"description": "CWE-20 Improper Input Validation",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-16T10:13:37.145Z",
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista"
},
"references": [
{
"name": "Security Advisory 0167",
"tags": [
"vendor-advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24723-security-advisory-0167"
}
],
"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-2026-73445 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\u003e4.34.8M 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-2026-73445 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- 4.34.8M 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 0167",
"defects": [
"BUG 1602625"
],
"discovery": "INTERNAL"
},
"title": "Security Advisory 0167",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003e1. Include exactly one UploadRequest in a gNSI Authz Rotate request.\u003c/p\u003e\u003cp\u003e2. Use a gNSI Authz policy that restricts gNSI Authz use to only those who strictly need it. Below is an example policy that only allows user \u0026quot;Neo\u0026quot; to rotate Authz policies:\u003c/p\u003e\u003cpre\u003e{\n \"name\":\"restrict-authz-policy\",\n \"allow_rules\":[\n {\n \"name\":\"neoallow\",\n \"request\":{\n \"paths\":[\n \"/gnsi.authz.v1.Authz/Rotate\"\n ],\n \"headers\":[\n {\n \"key\":\"username\",\n \"values\":[\n \"Neo\"\n ]\n }\n ]\n }\n },\n {\n \"name\":\"allow-gnmi\",\n \"request\":{\n \"paths\":[\n \"/gnmi.gNMI/*\"\n ]\n }\n },\n {\n \"name\":\"allow-gnoi\",\n \"request\":{\n \"paths\":[\n \"/gnoi.*\"\n ]\n }\n }\n ]\n}\u003c/pre\u003e\u003cp\u003eIdeally, this policy would be uploaded via a gNSI client for correct version and created-on metadata handling. However, the policy can also be written directly to the active policy file:\u003c/p\u003e\u003cpre\u003eswitch#bash timeout 100 echo \"{\\\"name\\\":\\\"restrict-authz-policy\\\",\\\"allow_rules\\\":[{\\\"name\\\":\\\"neoallow\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnsi.authz.v1.Authz\\/Rotate\\\"],\\\"headers\\\":[{\\\"key\\\":\\\"username\\\",\\\"values\\\":[\\\"Neo\\\"]}]}},{\\\"name\\\":\\\"allow-gnmi\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnmi.gNMI\\/*\\\"]}},{\\\"name\\\":\\\"allow-gnoi\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnoi.*\\\"]}}]}\" | sudo tee /persist/sys/gnsi/authz/policy.json \u0026amp;\u0026amp; sleep 11\u003c/pre\u003e"
}
],
"value": "1. Include exactly one UploadRequest in a gNSI Authz Rotate request.\n\n2. Use a gNSI Authz policy that restricts gNSI Authz use to only those who strictly need it. Below is an example policy that only allows user \"Neo\" to rotate Authz policies:\n\n {\n \"name\":\"restrict-authz-policy\",\n \"allow_rules\":[\n {\n \"name\":\"neoallow\",\n \"request\":{\n \"paths\":[\n \"/gnsi.authz.v1.Authz/Rotate\"\n ],\n \"headers\":[\n {\n \"key\":\"username\",\n \"values\":[\n \"Neo\"\n ]\n }\n ]\n }\n },\n {\n \"name\":\"allow-gnmi\",\n \"request\":{\n \"paths\":[\n \"/gnmi.gNMI/*\"\n ]\n }\n },\n {\n \"name\":\"allow-gnoi\",\n \"request\":{\n \"paths\":[\n \"/gnoi.*\"\n ]\n }\n }\n ]\n }\n\nIdeally, this policy would be uploaded via a gNSI client for correct version and created-on metadata handling. However, the policy can also be written directly to the active policy file:\n\n switch#bash timeout 100 echo \"{\\\"name\\\":\\\"restrict-authz-policy\\\",\\\"allow_rules\\\":[{\\\"name\\\":\\\"neoallow\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnsi.authz.v1.Authz\\/Rotate\\\"],\\\"headers\\\":[{\\\"key\\\":\\\"username\\\",\\\"values\\\":[\\\"Neo\\\"]}]}},{\\\"name\\\":\\\"allow-gnmi\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnmi.gNMI\\/*\\\"]}},{\\\"name\\\":\\\"allow-gnoi\\\",\\\"request\\\":{\\\"paths\\\":[\\\"\\/gnoi.*\\\"]}}]}\" | sudo tee /persist/sys/gnsi/authz/policy.json \u0026\u0026 sleep 11"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"assignerShortName": "Arista",
"cveId": "CVE-2026-73445",
"datePublished": "2026-09-16T08:58:51.242Z",
"dateReserved": "2026-08-12T16:42:47.920Z",
"dateUpdated": "2026-09-16T17:35:56.813Z",
"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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