CVE-2026-93952: Arista VeloCloud Orchestrator Improper Input Validation Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , the same day the CVE record was published.
- How likely is exploitation in the next 30 days?
- 1.4%
EPSS score, percentile 72.1 of all scored records
- How severe?
- 9.5 Critical
CVSS v4.0 base score, given by the CNA
- What should I do?
CISA deadline . Apply mitigations in accordance with vendor instructions … Full text
- Which versions are affected?
Affected
- 5.2.0 through 5.2.3.15
- 6.1.0 through 6.1.3.7
- 6.4.0 through 6.4.2.7
- 7.0.0 through 7.0.0.2
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
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 due date for this action: .
Solution (from the CVE record)
The recommended resolution is to upgrade to a remediated VCO software version at your earliest convenience. These vulnerabilities have been fixed in the following releases: - VCO 5.2.3.16 and later in the 5.2.3 train - VCO 6.4.2.8 and later in the 6.4.2 train Releases in other release trains that fix this will be added over time. For VCOs not on a supported release train, customers can contact TAC to discuss possible upgrade options.
Workaround (from the CVE record)
Until fixed software is deployed, operators should apply defense-in-depth controls appropriate for their environment: - Restrict access to the VCO web interface to trusted administrative networks. - Monitor the VCO for accesses from known malicious source IPs. - Monitor for unexpected outbound network activity from the VCO host. - Consider blocking outbound ports not needed for normal activities. - Monitor for backdoor daemons and webshells. - Review recent administrator activity for unexpected changes.
Advisories and patches
Linked from CISA's catalog entry
- https://www.arista.com/en/support/advisories-notices/security-advisory/24765-security-advisory-0183
- https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- https://nvd.nist.gov/vuln/detail/CVE-2026-93952
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | 5.2.0 through 5.2.3.15 |
| Affected | 6.1.0 through 6.1.3.7 |
| Affected | 6.4.0 through 6.4.2.7 |
| Affected | 7.0.0 through 7.0.0.2 |
Versions not listed are: unaffected.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
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.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2026-93952 to its Known Exploited Vulnerabilities (KEV) catalog on 22 Sep 2026.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 25 Sep 2026.
- The CVE record was published on 22 Sep 2026, the same day it was added to KEV.
- The CVE record carries a CVSS v4.0 base score of 9.5 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 1.4% (percentile 72.1), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
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.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-20: Improper Input Validation
Attack patterns (CAPEC)
- CAPEC-115: Authentication Bypass
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CVE record last updated | |
| CISA due date for the required action |
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