CVE-2026-102212 Opengear CVE debrief

Who should care

Defenders responsible for Opengear console server appliances, particularly those running firmware versions 4.8.0 through 5.5.2, should assess their exposure and prioritize verification and potential remediation.

Why it matters

CVE-2026-102212 is a high-severity vulnerability in Opengear console server appliances that allows unauthenticated remote attackers to crash the index.cgi process. Defenders should prioritize verification of affected systems, assess the need for firmware updates, and monitor for potential exploitation attempts.

• Potential disruption of console server operations via index.cgi process crashes
• Need for verification of affected firmware versions in inventory
• Potential for firmware updates to version 5.5.3 or later
• Monitoring for exploitation attempts targeting CVE-2026-102212

Technical summary

A heap-based buffer overflow vulnerability exists in Opengear IM72XX, CM71XX, and ACM70XX firmware versions 4.8.0 through 5.5.2 on console server appliances. An unauthenticated remote attacker can exploit this vulnerability by sending a crafted multipart/form-data POST request containing an overlong Content-Disposition name field, which can cause the index.cgi process to crash. The vulnerability affects Opengear console server appliances, and defenders should prioritize verification of affected systems, assess the need for firmware updates, and monitor for potential exploitation attempts.

Defensive priority

Defenders should prioritize verification of Opengear console server appliances running firmware versions 4.8.0 through 5.5.2 for potential exposure.

Recommended defensive actions

• Verify Opengear console server appliances running firmware versions 4.8.0 through 5.5.2 for potential exposure
• Assess the need for firmware updates to version 5.5.3 or later
• Monitor for potential exploitation attempts targeting CVE-2026-102212
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on a heap-based buffer overflow vulnerability in Opengear IM72XX, CM71XX, and ACM70XX firmware versions 4.8.0 through 5.5.2. The vulnerability allows unauthenticated remote attackers to crash the index.cgi process via a crafted multipart/form-data POST request containing an overlong Content-Disposition name field. Defenders should verify affected systems, assess the need for firmware updates, and monitor for potential exploitation attempts. Evidence is limited to CVE Program and NVD records

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.