CVE-2025-5089 (GCVE-0-2025-5089)

Vulnerability from cvelistv5 – Published: 2026-06-05 15:44 – Updated: 2026-06-05 15:44
VLAI
Title
Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages
Summary
In a CVX cluster, an EOS switch connected to a CVX server is not resilient to certain malformed messages received from the connected CVX server. Similarly, the CVX server is not resilient to certain malformed messages received from the connected EOS switch. This leads to either a Sysdb agent crash on the EOS device causing a soft reset of the switch or agent crashes on the CVX server causing instability of the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to already have a high privilege access to the connected device to be able to send custom TCP packets. EOS switches that are not connected to a CVX server are not impacted.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version
Arista Networks EOS / CloudVision eXchange (CVX) Affected: 4.34.0F , ≤ 4.34.1F (custom)
Affected: 4.33.0M , ≤ 4.33.4M (custom)
Affected: 4.32.0M , ≤ 4.32.6M (custom)
Affected: 4.31.0M , ≤ 4.31.8M (custom)
Affected: 4.30.0 , < 4.31.0 (custom)
Create a notification for this product.
Date Public
2025-12-18 16:40
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "platforms": [
            "CloudVision eXchange",
            "virtual or physical appliance"
          ],
          "product": "EOS / CloudVision eXchange (CVX)",
          "vendor": "Arista Networks",
          "versions": [
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              "lessThanOrEqual": "4.34.1F",
              "status": "affected",
              "version": "4.34.0F",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.33.4M",
              "status": "affected",
              "version": "4.33.0M",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.32.6M",
              "status": "affected",
              "version": "4.32.0M",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "4.31.8M",
              "status": "affected",
              "version": "4.31.0M",
              "versionType": "custom"
            },
            {
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              "version": "4.30.0",
              "versionType": "custom"
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          ]
        }
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      "configurations": [
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          "lang": "en",
          "supportingMedia": [
            {
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              "type": "text/html",
              "value": "\u003cp\u003eIn order to be vulnerable to CVE-2025-5089, the following condition must be met: CVX must be configured:\u003c/p\u003e\n\u003cpre\u003e\u003ccode\u003ecvx1#show cvx\n  Status: Enabled\n  Mode: Standalone\n  Heartbeat interval: 20.0\n  Heartbeat timeout: 60.0\n  Client connection state preserving: Disabled\n  \ncvx1#show running-config section cvx\ncvx\n   no shutdown\u003c/code\u003e\u003c/pre\u003e"
            }
          ],
          "value": "In order to be vulnerable to CVE-2025-5089, the following condition must be met: CVX must be configured:\n\n\n\n\ncvx1#show cvx\n  Status: Enabled\n  Mode: Standalone\n  Heartbeat interval: 20.0\n  Heartbeat timeout: 60.0\n  Client connection state preserving: Disabled\n  \ncvx1#show running-config section cvx\ncvx\n   no shutdown"
        }
      ],
      "datePublic": "2025-12-18T16:40:00.000Z",
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
              "value": "\u003cp\u003eIn a CVX cluster, an EOS switch connected to a CVX server is not resilient to certain malformed messages received from the connected CVX server. Similarly, the CVX server is not resilient to certain malformed messages received from the connected EOS switch. This leads to either a Sysdb agent crash on the EOS device causing a soft reset of the switch or agent crashes on the CVX server causing instability of the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to already have a high privilege access to the connected device to be able to send custom TCP packets. EOS switches that are not connected to a CVX server are not impacted.\u003c/p\u003e"
            }
          ],
          "value": "In a CVX cluster, an EOS switch connected to a CVX server is not resilient to certain malformed messages received from the connected CVX server. Similarly, the CVX server is not resilient to certain malformed messages received from the connected EOS switch. This leads to either a Sysdb agent crash on the EOS device causing a soft reset of the switch or agent crashes on the CVX server causing instability of the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to already have a high privilege access to the connected device to be able to send custom TCP packets. EOS switches that are not connected to a CVX server are not impacted."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "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:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "scenarios": [
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              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-20",
              "description": "CWE-20: Improper Input Validation",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-05T15:44:45.822Z",
        "orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
        "shortName": "Arista"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126"
        }
      ],
      "solutions": [
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          "lang": "en",
          "supportingMedia": [
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              "value": "\u003cp\u003eThe recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2025-5089 has been fixed in the following releases:\u003c/p\u003e\n\u003cul\u003e\n  \u003cli\u003e4.34.2F and later releases in the 4.34.x train\u003c/li\u003e\n  \u003cli\u003e4.33.5M and later releases in the 4.33.x train\u003c/li\u003e\n  \u003cli\u003e4.32.7M and later releases in the 4.32.x train\u003c/li\u003e\n  \u003cli\u003e4.31.9M and later releases in the 4.31.x train\u003c/li\u003e\n\u003c/ul\u003e"
            }
          ],
          "value": "The recommended resolution is to upgrade to a remediated software version at your earliest convenience. CVE-2025-5089 has been fixed in the following releases:\n\n\n\n    *  4.34.2F and later releases in the 4.34.x train\n\n    *  4.33.5M and later releases in the 4.33.x train\n\n    *  4.32.7M and later releases in the 4.32.x train\n\n    *  4.31.9M and later releases in the 4.31.x train"
        }
      ],
      "source": {
        "advisory": "0126",
        "defect": [
          "BUG1140255"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Arista EOS SysDB Agent Denial of Service via Malformed CVX Client/Server Messages",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eThere is no mitigation for this issue.\u003c/p\u003e"
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          ],
          "value": "There is no mitigation for this issue."
        }
      ],
      "x_capecAlignment": {
        "capecId": "CAPEC-125",
        "capecName": "Flooding / Malformed Packet",
        "justification": "The attack leverages structurally malformed message payloads communicated over a trusted client/server connection interface to trigger unhandled parser logic, inducing an agent process crash (Denial of Service)."
      },
      "x_generator": {
        "engine": "Vulnogram"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7",
    "assignerShortName": "Arista",
    "cveId": "CVE-2025-5089",
    "datePublished": "2026-06-05T15:44:45.822Z",
    "dateReserved": "2025-05-22T16:26:45.461Z",
    "dateUpdated": "2026-06-05T15:44:45.822Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-5089",
      "date": "2026-06-08",
      "epss": "0.00033",
      "percentile": "0.09964"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-5089\",\"sourceIdentifier\":\"psirt@arista.com\",\"published\":\"2026-06-05T17:16:30.180\",\"lastModified\":\"2026-06-05T19:03:48.933\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In a CVX cluster, an EOS switch connected to a CVX server is not resilient to certain malformed messages received from the connected CVX server. Similarly, the CVX server is not resilient to certain malformed messages received from the connected EOS switch. This leads to either a Sysdb agent crash on the EOS device causing a soft reset of the switch or agent crashes on the CVX server causing instability of the CVX cluster. An attacker could use this behavior to create a denial of service (DoS) scenario. Note that this would require the attacker to already have a high privilege access to the connected device to be able to send custom TCP packets. EOS switches that are not connected to a CVX server are not impacted.\"}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"psirt@arista.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"vectorString\":\"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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\",\"baseScore\":7.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"cvssMetricV31\":[{\"source\":\"psirt@arista.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"psirt@arista.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-20\"}]}],\"references\":[{\"url\":\"https://www.arista.com/en/support/advisories-notices/security-advisory/22868-security-advisory-0126\",\"source\":\"psirt@arista.com\"}]}}"
  }
}


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