CVE-2026-93952: Arista VeloCloud Orchestrator

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

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.

CISA’s summary

Arista VeloCloud Orchestrator (VCO) on-prem contains an improper input validation vulnerability that 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.

Weakness type: CWE-20.

Product: Arista VeloCloud Orchestrator · Assigned by: Arista · Published: 2026-09-22

Affected and fixed versions

Vendor	Product	Affected versions (per 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 scores

Scored by	CVSS	Score	Vector
Arista	3.1	10 Critical	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
Arista	4.0	9.5 Critical	`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`

Attack vector: network (remotely reachable)
Attack complexity: high (needs special conditions)
Attack requirements: none
Privileges required: none (no login)
User interaction: none

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

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.

Timeline

2026-07-27 — erroneo.us brief: Arista VeloCloud Orchestrator: Two Exploited CVSS 10 Flaws
2026-09-22 — Added to CISA’s Known Exploited Vulnerabilities catalog
2026-09-22 — CVE record published by Arista
2026-09-23 — CVE record last updated
2026-09-25 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.