Command Injection in Zyxel EMG2926 nslookup Diagnostic Tool
CVE-2017-6884 is a command injection vulnerability affecting the Zyxel EMG2926 home router running firmware V1.00(AAQT.4)b8. The flaw is in the router's diagnostic tools, specifically the nslookup functionality exposed via the expert/maintenance/diagnostic/nslookup endpoint. According to the provided content, attacker-controlled input such as the ping_ip parameter is insufficiently sanitized before being passed to an underlying system command, allowing arbitrary shell command injection and execution on the device.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Zyxel vulnerability that CISA KEV’s knownRansomwareCampaignUse field silently flipped to Known during 2025 (evidence of ransomware campaign use).
A specific known vulnerability (CVE-2017-6884) referenced as being exploited by the Rabbot worm to compromise IoT devices.
A Zyxel router command injection vulnerability included among the exploits used by the Mirai variant.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.