CVE-2026-93952 affects Arista VeloCloud Orchestrator (VCO) On-Prem. Previdian lists 4 version rows; examples include 5.2.0 to <= 5.2.3.15, 6.1.0 to <= 6.1.3.7, and 6.4.0 to <= 6.4.2.7.

CVE-2026-93952 Exploitation Attempts Observed in the Wild — VeloCloud Orchestrator (VCO) On-Prem

Q: Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Q: What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-93952 is an unauthenticated Security Advisory 0183 affecting Arista VeloCloud Orchestrator (VCO) On-Prem.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Also reported by third-party sources. Confidence is confirmed.

Who is affected?

Arista / VeloCloud Orchestrator (VCO) On-Prem, including 5.2.0 to <= 5.2.3.15, 6.1.0 to <= 6.1.3.7, and 6.4.0 to <= 6.4.2.7.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Security Advisory 0183

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.

Vendor Product Affected Status

Arista Networks Affected

VeloCloud Orchestrator (VCO) On-Prem

Through 5.2.3.15 Through 6.1.3.7 Through 6.4.2.7 Through 7.0.0.2

Affected

View vendor advisory

Published: 22 Sep 2026
Exploitation Attempts Reported: 22 Sep 2026
Attack vector: Remote
Complexity: High
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2026-93952
Security Advisory 0183 arista.com · Vendor Advisory https://www.arista.com/en/support/advisories-notices/security-advisor...

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

Arista

Recorded 22 Sep 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
Arista First	2026-09-22 10:06 UTC
The Hacker News	2026-09-22 13:31 UTC
CISA	2026-09-22 19:50 UTC
CVE	2026-09-22 20:01 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

9.5 Critical

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

1.4%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Input Validation CWE-20

Recent mention · The Hacker News

24 Oct 2026

CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloud

Ravie LakshmananOct 24, 2026Vulnerability / Network Security The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added two vulnerabilities impacting Collabora Online Built-in CODE Server and Arista VeloCloud Orchestrator (VCO) to its Known Exploited...

Read full advisory

All CVSS Scores

CVSS v4.0 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

CVSS v3.1 10.0 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

All Mentions

Recent mention · The Hacker News

CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloud

The Hacker News · 24 Oct 2026

Ravie LakshmananOct 24, 2026Vulnerability / Network Security The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Friday added two vulnerabilities impacting Collabora Online Built-in CODE Server and Arista VeloCloud Orchestrator (VCO) to its Known Exploited Vulnerabilities (KEV), citing reports of active exploitation in the wild. The critical-severity vulnerabilities are listed below - CVE-2026-110447 (CVSS score: 9.2) - An operating system command injection vulnerability in Collabora Online – Built-in CODE Server (aka richdocumentscode) when used within the NextCloud...

Recent mention · The Hacker News

Arista Warns of Critical VeloCloud SQL Injection Zero-Day Exploited in Attacks

The Hacker News · 22 Oct 2026

Swati KhandelwalOct 22, 2026Vulnerability / Enterprise Security Attackers are exploiting a zero-day SQL injection flaw in Arista's VeloCloud Orchestrator (VCO), the central management system for VeloCloud SD-WAN networks, the company said in an advisory on October 22. The flaw lets anyone who can log in to the orchestrator, even with a read-only customer account, gain operator privileges, the top level of control over it. For on-premises orchestrators, the fix is in VCO 5.2.3.18, 6.1.3.10, and 6.4.2.12, while Hosted and Dedicated orchestrators have already been patched. The flaw is...

Recent mention · The Hacker News

Critical FortiMail Zero-Day Flaw Exploited in Attacks Allows Unauthenticated Arbitrary File Writes

The Hacker News · 02 Oct 2026

Ravie LakshmananOct 02, 2026Vulnerability / Enterprise Security The U.S. Cybersecurity and Infrastructure Security Agency (CISA), on Thursday, added a critical security flaw impacting Fortinet FortiMail to its Known Exploited Vulnerabilities (KEV) catalog, following reports of active exploitation. The vulnerability, tracked as CVE-2026-104286 (CVSS score: 9.8), allows unauthenticated attackers to write arbitrary files on the underlying system. "An improper limitation of a pathname to a restricted directory ('path traversal') [CWE-22] and improper neutralization of NULL byte or NULL...

Recent mention · The Hacker News

New CVSS 10.0 VeloCloud Orchestrator Flaw Actively Exploited in Certificate-Based Setups

The Hacker News · 22 Sep 2026

Swati KhandelwalSep 22, 2026Vulnerability / Network Security Attackers are exploiting a new flaw in on-premises VeloCloud Orchestrator (VCO), the server that manages the Edge devices in a VeloCloud SD-WAN, Arista said on September 22. The flaw, tracked as CVE-2026-93952, may allow a remote attacker with no login access to privilege internal functions and affect the VCO host. Only orchestrators set up to authenticate their Edges with certificates are exposed. As of September 22, fixed releases are out for the 5.2 and 6.4 release trains, but not yet for the 6.1 and 7.0 trains. Arista has...

Recent mention · Arista

Security Advisory 0183

Arista · 21 Sep 2026

Date: September 22, 2026 Revision Date Changes 1.0 September 22, 2026 Initial release The CVE-ID tracking this issue: CVE-2026-93952 CVSSv3.1 Base Score: 10.0 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSSv4.0 Base Score: 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) Common Weakness Enumeration: CWE-20: Improper Input Validation This vulnerability is being tracked by BUG1907167, and BUG1937417. Description VeloCloud Orchestrator (VCO) on-pre ...

Timeline

From disclosure to observed exploitation attempts

22 Sep 2026
20:01 UTC

KEV confirmed by CVE

Exploitation attempts reported by an external source
22 Sep 2026
19:50 UTC

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
22 Sep 2026
13:31 UTC

KEV confirmed by The Hacker News

Exploitation attempts reported by an external source
22 Sep 2026
10:06 UTC

Added to Previdian KEV Feed

High-confidence, third-party report of exploitation attempts
22 Sep 2026
07:37 UTC

CVE published

Vulnerability disclosed publicly
19 Sep 2026
01:37 UTC

CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-93952

Sample API response

{
  "cve_id": "CVE-2026-93952",
  "confidence": "Confirmed",
  "cvss_score": 9.5,
  "cvss_estimated": false,
  "epss_score": 0.01384,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}

CVE-2026-93952

Security Advisory 0183

Tags

CVE References

Exploitation Attempts Observed in the Wild

Known exploited vulnerability sources

Scanner coverage

Virtual patch status

Weaknesses

CISA Flags Two Actively Exploited Critical Flaws in Collabora Online and Arista VeloCloud

All CVSS Scores

All Mentions

KEV confirmed by CVE

Added to CISA KEV

KEV confirmed by The Hacker News

Added to Previdian KEV Feed

CVE published

CVE ID reserved

Automate this intelligence