CVE-2026-120983 (GCVE-0-2026-120983)

Vulnerability from cvelistv5 – Published: 2026-11-10 20:09 – Updated: 2026-11-10 20:09
VLAI
Title
Security Advisory 0215
Summary
On affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU.
Severity
7.6 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
6.1 (Medium)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
CWE
  • CWE-284 - Improper Access Control
Assigner
Arista CNA under the mitre root
CNA scorecard B 87/100 over 116 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Arista Networks EOS Affected: 1.0.0 , < 4.33.0F (custom)
Affected: 4.33.0F , ≤ 4.33.9M (custom)
Affected: 4.34.0F , ≤ 4.34.7M (custom)
Affected: 4.35.0F , ≤ 4.35.5M (custom)
Affected: 4.36.0F , ≤ 4.36.1F (custom)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "710 Series",
            "720D Series",
            "720XP/722XPM Series",
            "7010TX Series",
            "7320X Series",
            "7060X/X2/X4/X5/X6/XE7 Series",
            "7260X/X3 Series",
            "7300X/X3 Series",
            "7050X3/X4 Series",
            "750X Series",
            "7250 Series",
            "7358X4 Series",
            "7368X4 Series",
            "7388X5 Series"
          ],
          "product": "EOS",
          "vendor": "Arista Networks",
          "versions": [
            {
              "lessThan": "4.33.0F",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.33.9M",
              "status": "affected",
              "version": "4.33.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.34.7M",
              "status": "affected",
              "version": "4.34.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.35.5M",
              "status": "affected",
              "version": "4.35.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.36.1F",
              "status": "affected",
              "version": "4.36.0F",
              "versionType": "custom"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cpre\u003econfig#interface Ethernet21/1\nconfig-if-Et21/1#show active\ninterface Ethernet21/1\n   speed forced 100gfull\n   switchport access vlan 2\n   dot1x pae authenticator\n   dot1x port-control auto\n   dot1x host-mode multi-host authenticated\n\nswitch# show policy-map type pbr\nService policy PermitAnyPolicy\n  Configured on: Vlan2\n  Applied on:    Vlan2\n  10: Class-map: PermitAnyClass (match-any)\n    Match: 10 IP Access List PermitAnyAcl\n        counters per-entry\n        10 permit ip any any\n\n    Configured actions: set nexthop 30.1.1.2\n    Active routing action:\n    VRF default\n        Route to nexthop 30.1.1.2 default\u003c/pre\u003e"
            }
          ],
          "value": "config#interface Ethernet21/1\nconfig-if-Et21/1#show active\ninterface Ethernet21/1\n   speed forced 100gfull\n   switchport access vlan 2\n   dot1x pae authenticator\n   dot1x port-control auto\n   dot1x host-mode multi-host authenticated\n\nswitch# show policy-map type pbr\nService policy PermitAnyPolicy\n  Configured on: Vlan2\n  Applied on:    Vlan2\n  10: Class-map: PermitAnyClass (match-any)\n    Match: 10 IP Access List PermitAnyAcl\n        counters per-entry\n        10 permit ip any any\n\n    Configured actions: set nexthop 30.1.1.2\n    Active routing action:\n    VRF default\n        Route to nexthop 30.1.1.2 default"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "On affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-212",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-212 Functionality Misuse"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.6,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-284",
              "description": "CWE-284 Improper Access Control",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T20:09:54.948Z",
        "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "shortName": "Arista"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25037-security-advisory-0215"
        }
      ],
      "source": {
        "advisory": "Security Advisory 0215",
        "defects": [
          "903925"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Security Advisory 0215",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cpre\u003eip access-list PermitAnyAcl\n  counters per-entry\n  10 permit ip 20.1.1.0/24 any\n\n(Workaround: Configure the PBR policy with specific, trusted address ranges rather than broad match rules)\u003c/pre\u003e"
            }
          ],
          "value": "ip access-list PermitAnyAcl\n  counters per-entry\n  10 permit ip 20.1.1.0/24 any\n\n(Workaround: Configure the PBR policy with specific, trusted address ranges rather than broad match rules)"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
    "assignerShortName": "Arista",
    "cveId": "CVE-2026-120983",
    "datePublished": "2026-11-10T20:09:54.948Z",
    "dateReserved": "2026-11-03T05:14:06.128Z",
    "dateUpdated": "2026-11-10T20:09:54.948Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-120983",
      "date": "2026-11-13",
      "epss": "0.00173",
      "percentile": "0.06806"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "platforms": [
                  "710 Series",
                  "720D Series",
                  "720XP/722XPM Series",
                  "7010TX Series",
                  "7320X Series",
                  "7060X/X2/X4/X5/X6/XE7 Series",
                  "7260X/X3 Series",
                  "7300X/X3 Series",
                  "7050X3/X4 Series",
                  "750X Series",
                  "7250 Series",
                  "7358X4 Series",
                  "7368X4 Series",
                  "7388X5 Series"
                ],
                "product": "EOS",
                "vendor": "Arista Networks",
                "versions": [
                  {
                    "lessThan": "4.33.0F",
                    "status": "affected",
                    "version": "1.0.0",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "4.33.9M",
                    "status": "affected",
                    "version": "4.33.0F",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "4.34.7M",
                    "status": "affected",
                    "version": "4.34.0F",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "4.35.5M",
                    "status": "affected",
                    "version": "4.35.0F",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "4.36.1F",
                    "status": "affected",
                    "version": "4.36.0F",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "psirt@arista.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "On affected EOS platforms where 802.1x is configured in multi-host authenticated mode and the device is configured with Policy Based Routing (PBR), traffic from unauthenticated hosts may be forwarded to the destination configured in the PBR policies. This could potentially allow unauthenticated hosts access to networks. Additionally Layer 2 and Layer 3 control packets from unauthenticated hosts may get copied to the CPU."
          }
        ],
        "id": "CVE-2026-120983",
        "lastModified": "2026-11-12T19:24:37.847",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 7.6,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 4.7,
              "source": "psirt@arista.com",
              "type": "Secondary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "ADJACENT",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 6.1,
                "baseSeverity": "MEDIUM",
                "confidentialityRequirement": "NOT_DEFINED",
                "exploitMaturity": "NOT_DEFINED",
                "integrityRequirement": "NOT_DEFINED",
                "modifiedAttackComplexity": "NOT_DEFINED",
                "modifiedAttackRequirements": "NOT_DEFINED",
                "modifiedAttackVector": "NOT_DEFINED",
                "modifiedPrivilegesRequired": "NOT_DEFINED",
                "modifiedSubAvailabilityImpact": "NOT_DEFINED",
                "modifiedSubConfidentialityImpact": "NOT_DEFINED",
                "modifiedSubIntegrityImpact": "NOT_DEFINED",
                "modifiedUserInteraction": "NOT_DEFINED",
                "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
                "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
                "modifiedVulnIntegrityImpact": "NOT_DEFINED",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/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",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "HIGH",
                "vulnIntegrityImpact": "LOW",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "psirt@arista.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-11-10T20:18:53.653",
        "references": [
          {
            "source": "psirt@arista.com",
            "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25037-security-advisory-0215"
          }
        ],
        "sourceIdentifier": "psirt@arista.com",
        "vulnStatus": "Awaiting Analysis",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-284"
              }
            ],
            "source": "psirt@arista.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}



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