CVE-2017-6884: Zyxel EMG2926 Routers Command Injection Vulnerability

Zyxel EMG2926 routers contain a command injection vulnerability located in the diagnostic tools, specifically the nslookup function. A malicious user may exploit numerous vectors to execute malicious commands on the router, such as the ping_ip parameter to the expert/maintenance/diagnostic/nslookup URI.

VendorZyxel
ProductEMG2926 Routers
Date added to KEV2023-09-18
Due date (BOD 22-01)2023-10-09
Known ransomware campaign useKnown
CWECWE-78
Required actionApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What to do

  1. Identify every instance of Zyxel EMG2926 Routers in your environment (asset inventory, EDR, vulnerability scanner).
  2. Apply CISA's required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
  3. Federal civilian agencies must act by 2023-10-09 under BOD 22-01; other organizations can use the same date as a target.
  4. Because ransomware use is known, check for signs of compromise and confirm backups are offline and tested.
  5. Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.

This CVE is flagged by CISA as known to be used in ransomware campaigns. Rehearse your response before you need it: Ransomware tabletop exercise kit (Runbook Foundry).

Sources

Generated from the CISA feed with AI assistance; facts are taken verbatim from the feed. Not affiliated with or endorsed by CISA. Facts come from the CISA Known Exploited Vulnerabilities catalog (public domain).