CVE-2026-93291: Omni C20 Certificate Validation Flaw Allows MITM to RCE TheHackerWire / 1d Telemetry Metric Intelligence Detail CVE Identifier CVE-2026-93291 CVSS Severity 9.4 CRITICAL Affected Target See technical breakdown Vulnerability Class CWE-94: Remote Code Execution (RCE) Exploit Availability No Public PoC Indexed EPSS Threat Score Awaiting scoring CISA KEV Status Not Listed in CISA KEV Remediation Status Advisory / Mitigation In Review The specific mechanism by which this man-in-the-mid

No standalone public exploit has been published in open research repositories at the time of writing. Our threat intelligence pipeline monitors GitHub, Exploit-DB, and Nuclei feeds continuously. Verified PoCs will be automatically integrated here upon discovery.

CVE-2026-93291 is a critical vulnerability impacting Omni C20 systems, stemming from a fundamental failure in certificate validation. This flaw enables an attacker to execute a man-in-the-middle attack, subsequently leading to arbitrary code execution and full compromise of the affected device.

Vulnerability Root Cause & Flaw Mechanism

The Omni C20 system fails to properly validate server or client certificates during the establishment of secure communication channels. This deficiency means the system does not adequately verify critical certificate attributes such as the issuer’s authenticity, the certificate’s expiry, or the hostname presented. Consequently, an attacker positioned on the network path can present a self-signed or otherwise invalid certificate, which the Omni C20 will accept without raising an alert or terminating the connection. This acceptance allows the attacker to transparently intercept, decrypt, modify, and re-encrypt all traffic flowing between the Omni C20 and its intended communication peer. The specific mechanism by which this man-in-the-middle capability transitions to arbitrary code execution is not detailed in the advisory but typically involves the attacker injecting malicious commands or malformed data into the intercepted communication stream, which the Omni C20 then processes without sufficient sanitization or validation, triggering an exploitable condition such as command injection, deserialization of untrusted data, or a memory corruption vulnerability.

Attack Prerequisites & Threat Vector

Successful exploitation of CVE-2026-93291 requires an attacker to be capable of performing a man-in-the-middle attack. This necessitates network access that allows interception of traffic to or from the Omni C20, which could involve physical proximity to the network, ARP spoofing within a local area network, DNS poisoning, control over a compromised router, or operating a rogue access point. No prior authentication to the Omni C20 device itself is required, making this a pre-authentication vulnerability from a network perspective. The attack progression involves the attacker establishing an MITM position, intercepting the Omni C20’s communication attempts, presenting a forged certificate that the Omni C20 accepts due to the validation flaw, and then manipulating the intercepted traffic to inject a payload that triggers arbitrary code execution on the device.

Detection, Log Analysis & Threat Hunting

Security analysts should scrutinize network traffic originating from or destined for Omni C20 instances for anomalous certificate activity. Indicators include connections established with untrusted or unexpected certificate authorities, the presence of self-signed certificates in contexts where they are not explicitly configured, or TLS/SSL handshake failures that are not immediately followed by connection termination. Syslog events or application logs on the Omni C20 or its communication peers should be monitored for unexpected process spawns, unusual outbound network connections, or errors related to certificate validation. For asset discovery, a Shodan query such as http.title:"Omni C20" OR http.html:"Omni C20" can identify potentially exposed instances. Google dorks like inurl:"Omni C20" intitle:"Omni C20" may also reveal management interfaces or documentation.

Defensive Hardening & Mitigation

Pending a vendor patch, immediate defensive hardening measures are critical. Omni C20 instances should be isolated within a highly segmented network, ideally in a dedicated VLAN with strict ingress and egress filtering. Implement firewall rules to restrict outbound connections from Omni C20 devices to only known, legitimate endpoints and IP addresses, thereby limiting an attacker’s ability to exfiltrate data or establish command and control channels post-compromise. Employ network access controls to prevent unauthorized devices from joining the same network segment as the Omni C20, hindering an attacker’s ability to position for a man-in-the-middle attack. Implement robust network monitoring to detect and alert on suspicious traffic patterns or certificate anomalies. The vendor has not yet released a patch for CVE-2026-93291.

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TheHackerWire Threat Intel Team