CVE-2026-120977 (GCVE-0-2026-120977)

Vulnerability from cvelistv5 – Published: 2026-11-10 20:09 – Updated: 2026-11-10 20:09
VLAI
Title
Security Advisory 0217
Summary
On affected platforms running Arista EOS with 802.1X with Dynamic Host Configuration Protocol (DHCP) device profiling enabled, a network-adjacent attacker can send a crafted DHCP packet to force the device to record a spoofed device profile. This may potentially allow the authenticated supplicant to acquire unauthorized access to a network segment with elevated privileges.
Severity
8.2 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N
7.1 (High)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N
CWE
  • CWE-807 - Reliance on Untrusted Inputs in a Security Decision
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: 4.31.2F , < 4.32.0F (custom)
Affected: 4.32.0F , < 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 , ≤ 4.36.2F (custom)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "710 Series",
            "720D Series",
            "720XP/722XPM Series",
            "750X Series",
            "7010TX Series",
            "7020R/R4 Series",
            "7260X/X3 Series",
            "7280R/R2/R3/R4 Series",
            "7050X3/X4 Series",
            "7060X/X2/X4/X5/X6/XE7 Series",
            "7300X/X3 Series",
            "7320X Series",
            "7358X4 Series",
            "7368X4 Series",
            "7388X5 Series",
            "7500R/R2/R3 Series",
            "7700R4 Series",
            "7800R3/R4 Series"
          ],
          "product": "EOS",
          "vendor": "Arista Networks",
          "versions": [
            {
              "lessThan": "4.32.0F",
              "status": "affected",
              "version": "4.31.2F",
              "versionType": "custom"
            },
            {
              "lessThan": "4.33.0F",
              "status": "affected",
              "version": "4.32.0F",
              "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": "4.36.2F",
              "status": "affected",
              "version": "4.36.0F",
              "versionType": "custom"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cpre\u003eswitch#show running-config\naaa accounting dot1x default start-stop group radius\n\ndot1x\n   ! Any one of the following DHCP profiling options is sufficient;\n   ! enabling all three is not required.\n   radius av-pair dhcp hostname\n   radius av-pair dhcp parameter-request-list\n   radius av-pair dhcp vendor-class-id\n\ninterface Ethernet5\n   switchport mode trunk\n   spanning-tree portfast edge\n   dot1x pae authenticator\n   dot1x port-control auto\ndot1x system-auth-control\u003c/pre\u003e"
            }
          ],
          "value": "switch#show running-config\naaa accounting dot1x default start-stop group radius\n\ndot1x\n   ! Any one of the following DHCP profiling options is sufficient;\n   ! enabling all three is not required.\n   radius av-pair dhcp hostname\n   radius av-pair dhcp parameter-request-list\n   radius av-pair dhcp vendor-class-id\n\ninterface Ethernet5\n   switchport mode trunk\n   spanning-tree portfast edge\n   dot1x pae authenticator\n   dot1x port-control auto\ndot1x system-auth-control"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "On affected platforms running Arista EOS with 802.1X with Dynamic Host Configuration Protocol (DHCP) device profiling enabled, a network-adjacent attacker can send a crafted DHCP packet to force the device to record a spoofed device profile. This may potentially allow the authenticated supplicant to acquire unauthorized access to a network segment with elevated privileges."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-194",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-194 Fake the Source of Data"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N",
            "version": "3.1"
          }
        },
        {
          "cvssV4_0": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/SA:N",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-807",
              "description": "CWE-807 Reliance on Untrusted Inputs in a Security Decision",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T20:09:52.143Z",
        "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "shortName": "Arista"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25039-security-advisory-0217"
        }
      ],
      "source": {
        "advisory": "Security Advisory 0217",
        "defects": [
          "1899366"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Security Advisory 0217"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
    "assignerShortName": "Arista",
    "cveId": "CVE-2026-120977",
    "datePublished": "2026-11-10T20:09:52.143Z",
    "dateReserved": "2026-11-03T05:14:06.127Z",
    "dateUpdated": "2026-11-10T20:09:52.143Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-120977",
      "date": "2026-11-11",
      "epss": "0.00161",
      "percentile": "0.05306"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "platforms": [
                  "710 Series",
                  "720D Series",
                  "720XP/722XPM Series",
                  "750X Series",
                  "7010TX Series",
                  "7020R/R4 Series",
                  "7260X/X3 Series",
                  "7280R/R2/R3/R4 Series",
                  "7050X3/X4 Series",
                  "7060X/X2/X4/X5/X6/XE7 Series",
                  "7300X/X3 Series",
                  "7320X Series",
                  "7358X4 Series",
                  "7368X4 Series",
                  "7388X5 Series",
                  "7500R/R2/R3 Series",
                  "7700R4 Series",
                  "7800R3/R4 Series"
                ],
                "product": "EOS",
                "vendor": "Arista Networks",
                "versions": [
                  {
                    "lessThan": "4.32.0F",
                    "status": "affected",
                    "version": "4.31.2F",
                    "versionType": "custom"
                  },
                  {
                    "lessThan": "4.33.0F",
                    "status": "affected",
                    "version": "4.32.0F",
                    "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": "4.36.2F",
                    "status": "affected",
                    "version": "4.36.0F",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "psirt@arista.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "On affected platforms running Arista EOS with 802.1X with Dynamic Host Configuration Protocol (DHCP) device profiling enabled, a network-adjacent attacker can send a crafted DHCP packet to force the device to record a spoofed device profile. This may potentially allow the authenticated supplicant to acquire unauthorized access to a network segment with elevated privileges."
          }
        ],
        "id": "CVE-2026-120977",
        "lastModified": "2026-11-10T20:18:52.800",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 8.2,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "LOW",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N",
                "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": 7.1,
                "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": "LOW",
                "subIntegrityImpact": "HIGH",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:L/SI:H/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": "NONE",
                "vulnConfidentialityImpact": "NONE",
                "vulnIntegrityImpact": "HIGH",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "source": "psirt@arista.com",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-11-10T20:18:52.800",
        "references": [
          {
            "source": "psirt@arista.com",
            "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25039-security-advisory-0217"
          }
        ],
        "sourceIdentifier": "psirt@arista.com",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-807"
              }
            ],
            "source": "psirt@arista.com",
            "type": "Secondary"
          }
        ]
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    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.