{"id":"CVE-2026-16812","published":"2026-07-27T16:17:03Z","modified":"2026-10-24T13:10:00Z","title":"Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability","vendor":"Arista","product":"VeloCloud Orchestrator","tier":"core","eol":null,"description":{"text":"VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access privileged internal functionality and impact the VCO host. Successful exploitation may compromise the confidentiality, integrity, and availability of the orchestrator and data managed by the orchestrator.\n\n\n\n\nThis functionality was intended to be for internal use only and is not intended to be remotely accessible.\n\n\n\n\nHosted and Dedicated versions of VCO have already been patched in advance of this notice going out.\n\n\n\n\nThis issue was discovered externally and is known to be actively exploited.","provenance":"source","from":"NVD"},"summary":{"text":"The Arista VeloCloud Orchestrator (VCO) on-prem product contains an OS command injection flaw in functionality meant only for internal use but reachable remotely. An unauthenticated remote attacker over the network, requiring no user interaction and no special configuration, can reach privileged internal functions to affect the VCO host and compromise the confidentiality, integrity, and availability of the orchestrator and the data it manages.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:45Z"},"cvss":{"score":10.0,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.0176,"percentile":0.77972,"date":"2026-10-30","provenance":"source"},"kev":{"dateAdded":"2026-07-27","dueDate":"2026-07-30","ransomware":false,"requiredAction":"Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.","notes":"https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-16812","provenance":"source"},"vulncheckKev":{"dateAdded":"2026-07-27","exploitedFirstSeen":"2026-07-27","ransomware":false,"evidence":[{"url":"https://previdian.com/CVE-2026-16812","date":"2026-07-27"},{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144","date":"2026-07-27"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2026-07-27"},{"url":"https://cydome.io/maritime-cybersecurity-bulletin-july-31st-2026/","date":"2026-07-31"},{"url":"https://www.resecurity.com/es/blog/article/cve-2026-16812-critical-command-injection-in-arista-velocloud-orchestrator","date":"2026-08-06"},{"url":"https://www.recordedfuture.com/blog/july-2026-cve-landscape","date":"2026-08-07"},{"url":"https://www.trellix.com/blogs/research/the-bug-report-august-2026-edition/","date":"2026-09-03"},{"url":"https://www.lumen.com/blog/en-us/silent-train-volt-typhoon-operational-framework","date":"2026-10-28"}],"evidenceTotal":8,"provenance":"source"},"exploited":true,"otx":{"pulseCount":46,"pulses":[{"name":"Actively_Exploited_Kev | Oct 31, 2026","url":"https://otx.alienvault.com/pulse/6ae4aefab0c2191cecd41862","created":"2026-10-30"},{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Volt Typhoon Used Covert Silent Train Network in Four Zero-Day Exploitation Campaigns","url":"https://otx.alienvault.com/pulse/6ae25986a5a09777ff89d848","created":"2026-10-28"},{"name":"Volt Typhoon Used Covert Silent Train Network in Four Zero-Day Exploitation Campaigns","url":"https://otx.alienvault.com/pulse/6ae259725b3c2c4fc06aa20e","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Arista patches new VeloCloud Orchestrator zero-day exploited in attacks","url":"https://otx.alienvault.com/pulse/6ada4e1c2502752ddf07131a","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"}],"provenance":"machine"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"references":[{"url":"https://www.arista.com/en/support/advisories-notices/security-advisory/24364-security-advisory-0144","tags":["Mitigation","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-16812","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: remote exploit of internet-facing orchestrator interface","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"this issue may allow a remote attacker to access privileged internal functionality","start":64,"end":146}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2026-49334","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-49334","exploited":true,"exploitedSince":"2026-07-27","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"}],"timeline":[{"date":"2026-07-27","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16812","provenance":"source"},{"date":"2026-07-27","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://previdian.com/CVE-2026-16812","provenance":"source"},{"date":"2026-07-27","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-07-27","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-49334","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":0},"priority":{"score":65.6,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":5.0,"detail":"added 96 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":15.59,"detail":"percentile 0.7797"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"46 pulses"},{"name":"CVSS severity","points":7.0,"detail":"base score 10.0"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}