CVE-2026-120982 (GCVE-0-2026-120982)

Vulnerability from cvelistv5 – Published: 2026-11-10 20:09 – Updated: 2026-11-10 20:09
VLAI
Title
Security Advisory 0207
Summary
On affected platforms running Arista EOS with Border Gateway Protocol (BGP) configured, An unauthenticated attacker who can establish a BGP peering session with an affected device and can send specially crafted BGP messages to cause repeated BGP session resets, enabling sustained disruption to network routing and traffic forwarding.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-440 - Expected Behavior Violation
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: 4.36.0F , ≤ 4.36.2F (custom)
Affected: 4.35.0F , ≤ 4.35.6M (custom)
Affected: 4.34.0F , ≤ 4.34.8M (custom)
Affected: 4.33.0F , ≤ 4.33.10M (custom)
Affected: 1.0.0 , < 4.33.0F (custom)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "710 Series",
            "720D Series",
            "720XP/722XPM Series",
            "750X Series",
            "7010TX Series",
            "7020R/R4 Series",
            "7130 Series running EOS",
            "7170 Series",
            "7050X3/X4 Series",
            "7060X/X2/X4/X5/X6/XE7 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",
            "ZTX-7200 Series",
            "CloudEOS",
            "cEOS-lab",
            "vEOS-lab",
            "CloudVision eXchange, virtual or physical appliance"
          ],
          "product": "EOS",
          "vendor": "Arista Networks",
          "versions": [
            {
              "lessThanOrEqual": "4.36.2F",
              "status": "affected",
              "version": "4.36.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.35.6M",
              "status": "affected",
              "version": "4.35.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.34.8M",
              "status": "affected",
              "version": "4.34.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.33.10M",
              "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": "\u003cpre\u003eswitch\u003eshow ip bgp summary\nBGP router identifier X.X.X.X, local AS number XXXXX\n...\nNeighbor     V  AS      MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc\nX.X.X.X      4  XXXXX   100       100      0   0     01:00:00 Estab  10     10\n\nswitch\u003eshow running-config all | inc service routing protocols\nservice routing protocols model multi-agent\u003c/pre\u003e"
            }
          ],
          "value": "switch\u003eshow ip bgp summary\nBGP router identifier X.X.X.X, local AS number XXXXX\n...\nNeighbor     V  AS      MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc\nX.X.X.X      4  XXXXX   100       100      0   0     01:00:00 Estab  10     10\n\nswitch\u003eshow running-config all | inc service routing protocols\nservice routing protocols model multi-agent"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "On affected platforms running Arista EOS with Border Gateway Protocol (BGP) configured, An unauthenticated attacker who can establish a BGP peering session with an affected device and can send specially crafted BGP messages to cause repeated BGP session resets, enabling sustained disruption to network routing and traffic forwarding."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-230",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-230 Serialized Data with Nested Payloads"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-440",
              "description": "CWE-440 Expected Behavior Violation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T20:09:54.489Z",
        "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "shortName": "Arista"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25029-security-advisory-0207"
        }
      ],
      "source": {
        "advisory": "Security Advisory 0207",
        "defects": [
          "1927714"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Security Advisory 0207",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cpre\u003erouter bgp \u003casn\u003e\n   neighbor default received attribute discard 22\n\nThe above configuration applies the mitigation globally. The attribute can be re-enabled on specific peers if it is required within the customer application. For example:\n\nrouter bgp \u003casn\u003e\n   no neighbor X.X.X.X received attribute discard 22\n\nAlternatively, a recommended mitigation to reduce exposure to this vulnerability is to configure BGP peer authentication using TCP-AO in order to ensure that only authorized peers can establish a BGP session.\u003c/pre\u003e"
            }
          ],
          "value": "router bgp \u003casn\u003e\n   neighbor default received attribute discard 22\n\nThe above configuration applies the mitigation globally. The attribute can be re-enabled on specific peers if it is required within the customer application. For example:\n\nrouter bgp \u003casn\u003e\n   no neighbor X.X.X.X received attribute discard 22\n\nAlternatively, a recommended mitigation to reduce exposure to this vulnerability is to configure BGP peer authentication using TCP-AO in order to ensure that only authorized peers can establish a BGP session."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
    "assignerShortName": "Arista",
    "cveId": "CVE-2026-120982",
    "datePublished": "2026-11-10T20:09:54.489Z",
    "dateReserved": "2026-11-03T05:14:06.127Z",
    "dateUpdated": "2026-11-10T20:09:54.489Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-120982",
      "date": "2026-11-11",
      "epss": "0.00353",
      "percentile": "0.29439"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "platforms": [
                  "710 Series",
                  "720D Series",
                  "720XP/722XPM Series",
                  "750X Series",
                  "7010TX Series",
                  "7020R/R4 Series",
                  "7130 Series running EOS",
                  "7170 Series",
                  "7050X3/X4 Series",
                  "7060X/X2/X4/X5/X6/XE7 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",
                  "ZTX-7200 Series",
                  "CloudEOS",
                  "cEOS-lab",
                  "vEOS-lab",
                  "CloudVision eXchange, virtual or physical appliance"
                ],
                "product": "EOS",
                "vendor": "Arista Networks",
                "versions": [
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                    "lessThanOrEqual": "4.36.2F",
                    "status": "affected",
                    "version": "4.36.0F",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "4.35.6M",
                    "status": "affected",
                    "version": "4.35.0F",
                    "versionType": "custom"
                  },
                  {
                    "lessThanOrEqual": "4.34.8M",
                    "status": "affected",
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                    "versionType": "custom"
                  },
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                    "lessThan": "4.33.0F",
                    "status": "affected",
                    "version": "1.0.0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "psirt@arista.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "On affected platforms running Arista EOS with Border Gateway Protocol (BGP) configured, An unauthenticated attacker who can establish a BGP peering session with an affected device and can send specially crafted BGP messages to cause repeated BGP session resets, enabling sustained disruption to network routing and traffic forwarding."
          }
        ],
        "id": "CVE-2026-120982",
        "lastModified": "2026-11-10T20:18:53.507",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
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              "impactScore": 3.6,
              "source": "psirt@arista.com",
              "type": "Secondary"
            }
          ],
          "cvssMetricV40": [
            {
              "cvssData": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "NONE",
                "attackVector": "NETWORK",
                "availabilityRequirement": "NOT_DEFINED",
                "baseScore": 8.7,
                "baseSeverity": "HIGH",
                "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:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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": "HIGH",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "psirt@arista.com",
              "type": "Secondary"
            }
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        },
        "published": "2026-11-10T20:18:53.507",
        "references": [
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            "source": "psirt@arista.com",
            "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25029-security-advisory-0207"
          }
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        "vulnStatus": "Received",
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                "value": "CWE-440"
              }
            ],
            "source": "psirt@arista.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}



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