---
title: "CVE-2026-93952: Arista VeloCloud Orchestrator Improper Input Validation Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-93952/
description: "CVE-2026-93952 (Arista VeloCloud Orchestrator): Exploited in the wild (CISA KEV). VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-22
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-93952"
kev: true
cvss: 9.5
epss: 0.01062
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-93952: Arista VeloCloud Orchestrator Improper Input Validation Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Arista VeloCloud Orchestrator. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-09-22, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-09-25 ; treat that as the outer limit, not the target.
- EPSS 1.1% , percentile 64: FIRST’s model estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 64% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. Arista VeloCloud Orchestrator: Two Exploited CVSS 10 Flaws — On-prem VCO operators should move to 5.2.3.16 or 6.4.2.8 now, lock the web interface down and hunt for the published backdoor files; both flaws are exploited, and the July fixes do not cover the September bug.

## What it is

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. Hosted, including Dedicated, versions of VCO were impacted and have already been patched.

## Affected products (CVE record)

- Arista Networks VeloCloud Orchestrator (VCO) On-Prem: 5.2.0 <= 5.2.3.15, 6.1.0 <= 6.1.3.7, 6.4.0 <= 6.4.2.7, 7.0.0 <= 7.0.0.2

## Severity

- Arista CVSS 3.1: 10 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
- Arista CVSS 4.0: 9.5 `CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H`

## Exploitation

- CISA KEV: added 2026-09-22; federal due date 2026-09-25. Known ransomware use: Unknown.
- CISA required action: 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.06% probability of exploitation activity in the next 30 days; percentile 64.

## Sources

- [Security Advisory 0183](https://www.arista.com/en/support/advisories-notices/security-advisory/24765-security-advisory-0183)
- [CVE.org record CVE-2026-93952](https://www.cve.org/CVERecord?id=CVE-2026-93952)
- [NVD entry CVE-2026-93952](https://nvd.nist.gov/vuln/detail/CVE-2026-93952)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-93952)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)

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Source page: https://erroneo.us/security/cve/CVE-2026-93952/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt