Vulnerability-Lookup

GHSA-JR73-XP57-W3RH

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30

Details

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

4.2 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

2.3 (Low)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-73440"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-212"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T10:16:51Z",
    "severity": "LOW"
  },
  "details": "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.",
  "id": "GHSA-jr73-xp57-w3rh",
  "modified": "2026-09-16T12:30:30Z",
  "published": "2026-09-16T12:30:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73440"
    },
    {
      "type": "WEB",
      "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24734-security-advisory-0178"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-73440 (GCVE-0-2026-73440)

Vulnerability from cvelistv5 – Published: 2026-09-16 09:55 – Updated: 2026-09-16 13:40

Title

Security Advisory 0178

Summary

Severity

4.2 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

2.3 (Low)


                        
                          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

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

Arista mitre root

References

1 reference

URL	Tags
https://www.arista.com/en/support/advisories-noti…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
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)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-73440",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-16T13:40:14.055400Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-16T13:40:25.872Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "710 Series",
            "720D Series",
            "720XP/722XPM Series",
            "750X Series",
            "7010TX Series",
            "7020R/R4 Series",
            "7130 Series running EOS",
            "7150 Series",
            "7170 Series",
            "7050X3/X4 Series",
            "7060X/X2/X4/X5/X6 Series",
            "7260X/X3 Series",
            "7280R/R2/R3/R4 Series",
            "7300X/X3 Series",
            "7320X Series",
            "7358X4 Series",
            "7368X4 Series",
            "7388X5 Series",
            "7500R/R2/R3 Series",
            "7800R3/R4 Series",
            "7700R4 Series",
            "AWE 5000 Series",
            "AWE 7200R Series",
            "CloudEOS",
            "cEOS-lab",
            "vEOS-lab",
            "CloudVision eXchange, virtual or physical appliance"
          ],
          "product": "EOS",
          "vendor": "Arista Networks",
          "versions": [
            {
              "lessThanOrEqual": "4.36.1F",
              "status": "affected",
              "version": "4.36.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.35.5M",
              "status": "affected",
              "version": "4.35.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.34.7.1M",
              "status": "affected",
              "version": "4.34.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.33.9M",
              "status": "affected",
              "version": "4.33.0F",
              "versionType": "custom"
            },
            {
              "lessThan": "4.33.0F",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "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": [
            {
              "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\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"
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      "title": "Security Advisory 0178",
      "workarounds": [
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            {
              "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"
}

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.

Detection rules are retrieved from Rulezet.

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.

Related by attack behaviour

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