CVE-2026-73440 (GCVE-0-2026-73440)
Vulnerability from cvelistv5 – Published: 2026-09-16 09:55 – Updated: 2026-09-16 13:40
VLAI
EPSS
VEX
Title
Security Advisory 0178
Summary
On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device's running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS).
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 13:40 UTC
CWE
- CWE-212 - Improper Removal of Sensitive Information Before Storage or Transfer
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 , ≤ 4.36.1F
(custom)
Affected: 4.35.0F , ≤ 4.35.5M (custom) Affected: 4.34.0F , ≤ 4.34.7.1M (custom) Affected: 4.33.0F , ≤ 4.33.9M (custom) Affected: 1.0.0 , < 4.33.0F (custom) |
guessed |
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"value": "\u003cp\u003eIn order to be vulnerable to CVE-2026-73440, the following conditions must all be met:\u003c/p\u003e\u003cul\u003e\u003cli\u003eSNMPv3 must be configured with at least one local or remote user that has an authentication key.\u003c/li\u003e\u003cli\u003eThe SNMPv3 user CLI configuration uses the legacy syntax and does not include the updated \u0026quot;key \u0026lt;algo\u0026gt; \u0026lt;encrypted_text\u0026gt;\u0026quot; syntax.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eFor example:\u003c/p\u003e\u003cpre\u003eswitch# show running-config | section snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 f4b9ec9a299a10a5dec3541f44f44000484254ee56fa404236730520e10ce689\u003c/pre\u003e\u003cp\u003eTo verify whether any SNMPv3 users with authentication are configured:\u003c/p\u003e\u003cpre\u003eswitch# show snmp user\n\nUser name : alice\nSecurity model : v3\nEngine ID : f5717f2cdde9bb946d00\nAuthentication : SHA-256\nPrivacy : None\nGroup : group_alice\u003c/pre\u003e\u003cp\u003eIf SNMP is not configured or no SNMPv3 users are configured, there is no exposure to this issue:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow snmp\nChassis: XXXXXXXXXXX\nSNMP agent enabled in VRFs: default\nTransmit message maximum size: 65536\nSNMP agent disabled: Either no communities and no users are configured, or no VRFs are configured.\u003c/pre\u003e"
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"value": "\u003cp\u003eIn order to be vulnerable to CVE-2026-73440, the following conditions must all be met:\u003c/p\u003e\u003cul\u003e\u003cli\u003eSNMPv3 must be configured with at least one local or remote user that has an authentication key.\u003c/li\u003e\u003cli\u003eThe SNMPv3 user CLI configuration uses the legacy syntax and does not include the updated \u0026quot;key \u0026lt;algo\u0026gt; \u0026lt;encrypted_text\u0026gt;\u0026quot; syntax.\u003c/li\u003e\u003c/ul\u003e\u003cp\u003eFor example:\u003c/p\u003e\u003cpre\u003eswitch# show running-config | section snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 f4b9ec9a299a10a5dec3541f44f44000484254ee56fa404236730520e10ce689\u003c/pre\u003e\u003cp\u003eTo verify whether any SNMPv3 users with authentication are configured:\u003c/p\u003e\u003cpre\u003eswitch# show snmp user\n\nUser name : alice\nSecurity model : v3\nEngine ID : f5717f2cdde9bb946d00\nAuthentication : SHA-256\nPrivacy : None\nGroup : group_alice\u003c/pre\u003e\u003cp\u003eIf SNMP is not configured or no SNMPv3 users are configured, there is no exposure to this issue:\u003c/p\u003e\u003cpre\u003eswitch\u003eshow snmp\nChassis: XXXXXXXXXXX\nSNMP agent enabled in VRFs: default\nTransmit message maximum size: 65536\nSNMP agent disabled: Either no communities and no users are configured, or no VRFs are configured.\u003c/pre\u003e"
}
],
"value": "In order to be vulnerable to CVE-2026-73440, the following conditions must all be met:\n\n- SNMPv3 must be configured with at least one local or remote user that has an authentication key.\n- The SNMPv3 user CLI configuration uses the legacy syntax and does not include the updated \"key \u003calgo\u003e \u003cencrypted_text\u003e\" syntax.\n\nFor example:\n\n switch# show running-config | section snmp-server\n snmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 f4b9ec9a299a10a5dec3541f44f44000484254ee56fa404236730520e10ce689\n\nTo verify whether any SNMPv3 users with authentication are configured:\n\n switch# show snmp user\n\n User name : alice\n Security model : v3\n Engine ID : f5717f2cdde9bb946d00\n Authentication : SHA-256\n Privacy : None\n Group : group_alice\n\nIf SNMP is not configured or no SNMPv3 users are configured, there is no exposure to this issue:\n\n switch\u003eshow snmp\n Chassis: XXXXXXXXXXX\n SNMP agent enabled in VRFs: default\n Transmit message maximum size: 65536\n SNMP agent disabled: Either no communities and no users are configured, or no VRFs are configured."
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eOn affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device\u0027s running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS).\u003c/p\u003e\u003cp\u003eThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks.\u003c/p\u003e"
}
],
"value": "On affected platforms running Arista EOS with Simple Network Management Protocol (SNMP) configured, SNMPv3 local or remote user credentials may be exposed as a one-way hashed, localized key value within the device\u0027s running and sanitized configurations. An authenticated user who gains access to this sensitive information could leverage it to perform unauthorized read operations on SNMP tables or to send fraudulent trap notifications to the Network Management System (NMS).\n\nThis issue was discovered internally by Arista, and the company is not aware of any malicious exploitation of this vulnerability in customer networks."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 4.2,
"baseSeverity": "MEDIUM",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
},
{
"cvssV4_0": {
"baseScore": 2.3,
"baseSeverity": "LOW",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
"version": "4.0"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-212",
"description": "CWE-212 Improper Removal of Sensitive Information Before Storage or Transfer",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-16T10:13:41.299Z",
"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"shortName": "Arista"
},
"references": [
{
"name": "Security Advisory 0178",
"tags": [
"vendor-advisory"
],
"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24734-security-advisory-0178"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
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"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\u003eFollowing the system upgrade, users are required to execute the syntax conversion command specified below to adopt the updated, encrypted SNMPv3 CLI format:\u003c/p\u003e\u003cpre\u003eswitch# configure convert new-syntax\u003c/pre\u003e\u003cp\u003eThe updated encrypted SNMPv3 CLI configuration follows this structure, incorporating the newly introduced \u0026quot;key \u0026lt;algo\u0026gt; \u0026lt;encrypted_text\u0026gt;\u0026quot; syntax:\u003c/p\u003e\u003cpre\u003eswitch# show running-config | grep snmp-server\nsnmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 key 7 005D110205085E520B754E1B591C504542585F557D2F217064607A10034752035500080755575640440F5C00505053515F08525208035C1605525E0A040E781F4D\u003c/pre\u003e\u003cp\u003eCVE-2026-73440 has been fixed in the following releases:\u003c/p\u003e\u003cul\u003e\u003cli\u003e4.36.2F 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\u003e4.33.10M 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\nFollowing the system upgrade, users are required to execute the syntax conversion command specified below to adopt the updated, encrypted SNMPv3 CLI format:\n\n switch# configure convert new-syntax\n\nThe updated encrypted SNMPv3 CLI configuration follows this structure, incorporating the newly introduced \"key \u003calgo\u003e \u003cencrypted_text\u003e\" syntax:\n\n switch# show running-config | grep snmp-server\n snmp-server user alice group_alice v3 localized f5717f2cdde9bb946d00 auth sha256 key 7 005D110205085E520B754E1B591C504542585F557D2F217064607A10034752035500080755575640440F5C00505053515F08525208035C1605525E0A040E781F4D\n\nCVE-2026-73440 has been fixed in the following releases:\n- 4.36.2F 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- 4.33.10M and later releases in the 4.33.x train\n\nNo hotfix is available for this issue."
}
],
"source": {
"advisory": "Security Advisory 0178",
"defects": [
"BUG 1856462",
"BUG 1966273"
],
"discovery": "INTERNAL"
},
"title": "Security Advisory 0178",
"workarounds": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eNo mitigation exists.\u003c/p\u003e"
}
],
"value": "No mitigation exists."
}
]
}
},
"cveMetadata": {
"assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
"assignerShortName": "Arista",
"cveId": "CVE-2026-73440",
"datePublished": "2026-09-16T09:55:14.571Z",
"dateReserved": "2026-08-12T16:39:35.977Z",
"dateUpdated": "2026-09-16T13:40:25.872Z",
"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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