{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86107", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "state": "PUBLISHED", "assignerShortName": "Arista", "dateReserved": "2026-09-05T01:54:43.258Z", "datePublished": "2026-09-16T10:49:31.522Z", "dateUpdated": "2026-09-16T10:49:31.522Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-09-16T10:49:31.522Z"}, "title": "Security Advisory 0180", "descriptions": [{"lang": "en", "value": "The VeloCloud Edge and Gateway exhibit an out-of-bounds write vulnerability when processing tunneled IP fragments between authenticated overlay neighbors. This vulnerability impacts the VeloCloud VCMP tunnel protocol only.\n\nA successful exploit can cause the affected process to terminate and restart, leading to a temporary disruption of traffic. Hosts on the internet that are unauthenticated and unable to form an overlay peer relationship can not trigger the vulnerable logic.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The VeloCloud Edge and Gateway exhibit an out-of-bounds write vulnerability when processing tunneled IP fragments between authenticated overlay neighbors. This vulnerability impacts the VeloCloud VCMP tunnel protocol only.</p>\n<p>A successful exploit can cause the affected process to terminate and restart, leading to a temporary disruption of traffic. Hosts on the internet that are unauthenticated and unable to form an overlay peer relationship can not trigger the vulnerable logic.</p>"}]}], "affected": [{"vendor": "Arista Networks", "product": "VeloCloud", "defaultStatus": "unaffected", "platforms": ["VeloCloud Edge", "VeloCloud Gateway"], "versions": [{"version": "1.0.0.0", "lessThan": "5.2.0.0", "status": "affected", "versionType": "custom"}, {"version": "5.2.0.0", "lessThan": "5.2.7.0", "status": "affected", "versionType": "custom"}, {"version": "6.1.0.0", "lessThan": "6.1.5.0", "status": "affected", "versionType": "custom"}, {"version": "6.4.0.0", "lessThan": "6.4.2.0", "status": "affected", "versionType": "custom"}]}, {"vendor": "Arista Networks", "product": "VeloCloud Gateway", "defaultStatus": "unaffected", "platforms": ["VeloCloud Gateway"], "versions": [{"version": "1.0.0.0", "lessThan": "5.2.0.0", "status": "affected", "versionType": "custom"}, {"version": "5.2.0.0", "lessThan": "5.2.7.0", "status": "affected", "versionType": "custom"}, {"version": "6.1.0.0", "lessThan": "6.1.5.0", "status": "affected", "versionType": "custom"}, {"version": "6.4.0.0", "lessThan": "6.4.2.0", "status": "affected", "versionType": "custom"}]}], "configurations": [{"lang": "en", "value": "The vulnerability requires an authenticated VCMP tunnel to be established between a target VeloCloud Edge or Gateway and a malicious peer.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The vulnerability requires an authenticated VCMP tunnel to be established between a target VeloCloud Edge or Gateway and a malicious peer.</p>"}]}], "workarounds": [{"lang": "en", "value": "No mitigation is available for this issue. Customers should restrict overlay peer relationships to trusted devices and monitor for unexpected fragmentation behavior.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>No mitigation is available for this issue. Customers should restrict overlay peer relationships to trusted devices and monitor for unexpected fragmentation behavior.</p>"}]}], "solutions": [{"lang": "en", "value": "The following releases contain the fix:\n- 5.2.7.0 and later in the 5.2.x train\n- 6.1.5.0 and later in the 6.1.x train\n- 6.4.2.0 and later in the 6.4.x train\n- 7.0.0 and later\n\nNo hotfix is available for this issue.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>The following releases contain the fix:</p>\n<ul>\n<li>5.2.7.0 and later in the 5.2.x train</li>\n<li>6.1.5.0 and later in the 6.1.x train</li>\n<li>6.4.2.0 and later in the 6.4.x train</li>\n<li>7.0.0 and later</li>\n</ul>\n<p>No hotfix is available for this issue.</p>"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.9, "baseSeverity": "MEDIUM"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N", "baseScore": 8.2, "baseSeverity": "HIGH"}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write"}]}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24736-security-advisory-0180", "tags": ["vendor-advisory"]}], "impacts": [{"capecId": "CAPEC-100", "descriptions": [{"lang": "en", "value": "CAPEC-100 Overflow Buffers"}]}], "source": {"advisory": "Security Advisory 0180", "discovery": "INTERNAL", "defects": ["BUG1833888"]}, "datePublic": "2026-09-09T00:00:00.000Z"}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["VeloCloud Edge", "VeloCloud Gateway"], "product": "VeloCloud", "vendor": "Arista Networks", "versions": [{"lessThan": "5.2.0.0", "status": "affected", "version": "1.0.0.0", "versionType": "custom"}, {"lessThan": "5.2.7.0", "status": "affected", "version": "5.2.0.0", "versionType": "custom"}, {"lessThan": "6.1.5.0", "status": "affected", "version": "6.1.0.0", "versionType": "custom"}, {"lessThan": "6.4.2.0", "status": "affected", "version": "6.4.0.0", "versionType": "custom"}]}, {"defaultStatus": "unaffected", "platforms": ["VeloCloud Gateway"], "product": "VeloCloud Gateway", "vendor": "Arista Networks", "versions": [{"lessThan": "5.2.0.0", "status": "affected", "version": "1.0.0.0", "versionType": "custom"}, {"lessThan": "5.2.7.0", "status": "affected", "version": "5.2.0.0", "versionType": "custom"}, {"lessThan": "6.1.5.0", "status": "affected", "version": "6.1.0.0", "versionType": "custom"}, {"lessThan": "6.4.2.0", "status": "affected", "version": "6.4.0.0", "versionType": "custom"}]}], "source": "psirt@arista.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "The VeloCloud Edge and Gateway exhibit an out-of-bounds write vulnerability when processing tunneled IP fragments between authenticated overlay neighbors. This vulnerability impacts the VeloCloud VCMP tunnel protocol only.\n\nA successful exploit can cause the affected process to terminate and restart, leading to a temporary disruption of traffic. Hosts on the internet that are unauthenticated and unable to form an overlay peer relationship can not trigger the vulnerable logic."}], "id": "CVE-2026-86107", "lastModified": "2026-09-16T11:16:43.920", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "psirt@arista.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.2, "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:H/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"}]}, "published": "2026-09-16T11:16:43.920", "references": [{"source": "psirt@arista.com", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/24736-security-advisory-0180"}], "sourceIdentifier": "psirt@arista.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "psirt@arista.com", "type": "Secondary"}]}

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