{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-121287", "assignerOrgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "state": "PUBLISHED", "assignerShortName": "Arista", "dateReserved": "2026-11-03T11:21:01.891Z", "datePublished": "2026-11-10T20:09:55.863Z", "dateUpdated": "2026-11-10T20:09:55.863Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "c8b34d1a-69ae-45c3-88fe-f3b3d44f39b7", "shortName": "Arista", "dateUpdated": "2026-11-10T20:09:55.863Z"}, "title": "Security Advisory 0221", "descriptions": [{"lang": "en", "value": "An unauthenticated attacker on an adjacent network segment can send crafted RIPv2 packets to a RIP-enabled interface on the device to trigger the Rip agent crash without providing valid credentials. Repeated exploitation reliably interrupts routing service on the affected device, which may also disrupt routing for other devices that depend on it. In a worst-case scenario, the vulnerability may allow an attacker to execute arbitrary code on the affected device."}], "affected": [{"vendor": "Arista Networks", "product": "EOS", "defaultStatus": "unaffected", "versions": [{"version": "4.37.0F", "status": "affected", "versionType": "custom"}, {"version": "4.36.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.36.2F"}, {"version": "4.35.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.35.6M"}, {"version": "4.34.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.34.8M"}, {"version": "4.33.0F", "status": "affected", "versionType": "custom", "lessThanOrEqual": "4.33.10M"}, {"version": "4.32.0F", "status": "affected", "versionType": "custom", "lessThan": "4.33.0F"}, {"version": "1.0.0", "status": "affected", "versionType": "custom", "lessThan": "4.32.0F"}], "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", "CloudEOS", "cEOS-lab", "vEOS-lab", "CloudVision eXchange, virtual or physical appliance"]}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}}, {"cvssV4_0": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N", "baseScore": 7.7, "baseSeverity": "HIGH"}}], "references": [{"url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25043-security-advisory-0221", "tags": ["vendor-advisory"]}], "source": {"defects": ["1981970"], "advisory": "Security Advisory 0221", "discovery": "INTERNAL"}, "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-124", "description": "CWE-124 Buffer Underwrite ('Buffer Underflow')"}]}], "configurations": [{"lang": "en", "value": "switch# show running-config | section router rip\nrouter rip\n no shutdown\n network 192.0.2.0/24\n\nswitch# show running-config interfaces Ethernet1\ninterface Ethernet1\n ip address 192.0.2.1/24 \n rip authentication algorithm md5 tx key-id 10", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<pre>switch# show running-config | section router rip\nrouter rip\n no shutdown\n network 192.0.2.0/24\n\nswitch# show running-config interfaces Ethernet1\ninterface Ethernet1\n ip address 192.0.2.1/24 \n rip authentication algorithm md5 tx key-id 10</pre>"}]}], "workarounds": [{"lang": "en", "value": "switch(config)# router rip\nswitch(config-router-rip)# shutdown\nswitch(config-router-rip)# end\n\nNote: disabling RIP or changing network statements may withdraw routes and interrupt connectivity. Plan a change window, confirm alternate routing, and verify the resulting configuration and route behavior.", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<pre>switch(config)# router rip\nswitch(config-router-rip)# shutdown\nswitch(config-router-rip)# end\n\nNote: disabling RIP or changing network statements may withdraw routes and interrupt connectivity. Plan a change window, confirm alternate routing, and verify the resulting configuration and route behavior.</pre>"}]}], "impacts": [{"capecId": "CAPEC-115", "descriptions": [{"lang": "en", "value": "CAPEC-115 Authentication Bypass"}]}]}}}

{}

{"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", "CloudEOS", "cEOS-lab", "vEOS-lab", "CloudVision eXchange, virtual or physical appliance"], "product": "EOS", "vendor": "Arista Networks", "versions": [{"status": "affected", "version": "4.37.0F", "versionType": "custom"}, {"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": "4.32.0F", "versionType": "custom"}, {"lessThan": "4.32.0F", "status": "affected", "version": "1.0.0", "versionType": "custom"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An unauthenticated attacker on an adjacent network segment can send crafted RIPv2 packets to a RIP-enabled interface on the device to trigger the Rip agent crash without providing valid credentials. Repeated exploitation reliably interrupts routing service on the affected device, which may also disrupt routing for other devices that depend on it. In a worst-case scenario, the vulnerability may allow an attacker to execute arbitrary code on the affected device."}], "id": "CVE-2026-121287", "lastModified": "2026-11-10T20:18:53.950", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "[email protected]", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "ADJACENT", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.7, "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": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:L/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": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "[email protected]", "type": "Secondary"}]}, "published": "2026-11-10T20:18:53.950", "references": [{"source": "[email protected]", "url": "https://www.arista.com/en/support/advisories-notices/security-advisory/25043-security-advisory-0221"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-124"}], "source": "[email protected]", "type": "Secondary"}]}

{}

{}