CVE-2026-16812
CVE-2026-16812 is a security flaw in Arista VeloCloud Orchestrator. Attackers can run commands on Arista VeloCloud Orchestrator. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 27 Jul 2026.[1]
Arista VeloCloud Orchestrator is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Fixed in version 5.2.3.14, 6.1.3.4, 6.4.2.4 and 7.0.0.1 of VeloCloud Orchestrator On-Prem.
Description
CISA calls it an on-prem OS command injection in Arista VeloCloud Orchestrator. In its words: “Arista VeloCloud Orchestrator On-Prem contains an OS command injection 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.”[1]
The CVE record adds: “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. This functionality was intended to be for internal use only and is not intended to be remotely accessible. Hosted and Dedicated versions of VCO have already been patched in advance of this notice going out. This issue was discovered externally and is known to be actively exploited.”[2]
The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.
It scores 10.0 out of 10 on the Common Vulnerability Scoring System, which rates it critical, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record lists these fixed versions: in each line, everything before the version shown is affected.[2]
| Product | Fixed in |
|---|---|
| VeloCloud Orchestrator On-Prem | 5.2.3.14 |
| VeloCloud Orchestrator On-Prem | 6.1.3.4 |
| VeloCloud Orchestrator On-Prem | 6.4.2.4 |
| VeloCloud Orchestrator On-Prem | 7.0.0.1 |
Most families won’t have Arista VeloCloud Orchestrator; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 27 Jul 2026, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 30 Jul 2026 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 2%. That’s in the top 22% of the flaws it scores.[4]
CISA assesses it as automatable: attackers can run it against many targets at once.
CISA doesn’t say who was attacked, or how.
Fix
Arista has published a fix or advice.[3] CISA’s 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).”[1]
- Check whether you use it.Arista VeloCloud Orchestrator is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed (fixed in version 5.2.3.14, 6.1.3.4, 6.4.2.4 and 7.0.0.1 of VeloCloud Orchestrator On-Prem), or not in use. CISA gave US government agencies until 30 Jul 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 10.0.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 2%.[4] |
See also
Other Arista VeloCloud Orchestrator flaws
- CVE-2026-114625: SQL injection ·
- CVE-2026-93952: improper input validation ·
Other Arista flaws
- CVE-2026-7473, Arista Extensible Operating System: incomplete comparison with missing factors ·
Other OS command injection flaws
- CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
- CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
- CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
- CVE-2026-49869, Kestra OSS: OSS OS command injection ·
- CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·
Added the same day
- CVE-2025-68686, Fortinet FortiOS: exposure of sensitive information to an unauthorized actor ·
Every Arista flaw on CISA’s list · Everything added in July 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Arista VeloCloud Orchestrator On-Prem OS Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 27 Jul 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-16812 Detail”. National Vulnerability Database, published 27 Jul 2026.
- ^ Arista. Advisories and fixes: arista.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.018, percentile 78.0, 31 Oct 2026.
- CVE Program. “CVE-2026-16812”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.