CVE-2017-6884
HighExploitedPublic exploitA command injection vulnerability was discovered on the Zyxel EMG2926 home router with firmware V1.00(AAQT.4)b8.
Published Apr 6, 2017 · Updated Oct 1, 2026
Key Facts
Patch immediately- CVE-2017-6884 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Emg2926 Firmware (Zyxel).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 8, 2020 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 33% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
33%
Higher than 98.3% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2017-6884 brief as a PDF
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Description
A command injection vulnerability was discovered on the Zyxel EMG2926 home router with firmware V1.00(AAQT.4)b8. The vulnerability is located in the diagnostic tools, specifically the nslookup function. A malicious user may exploit numerous vectors to execute arbitrary commands on the router, such as the ping_ip parameter to the expert/maintenance/diagnostic/nslookup URI.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 18, 2023 | Oct 9, 2023 | Known |
| Industry KEV feed | Jan 8, 2020 | Oct 9, 2023 | Known |
| CIRCL KEV | Sep 18, 2023 | Oct 9, 2023 | Known |
| ENISA EUVD | Sep 18, 2023 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Emg2926 FirmwareZyxel | v1.00\(aaqt.4\)b8 | n/a |
Timeline
Publicly disclosed
Apr 6, 2017
Added to Industry KEV feed
Jan 8, 2020
Added to CISA KEV
Sep 18, 2023
Added to CIRCL KEV
Sep 18, 2023
Added to ENISA EUVD
Sep 18, 2023
Last updated
Oct 1, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitExploitDB-41782
FAQ
Common Questions.
A command injection vulnerability was discovered on the Zyxel EMG2926 home router with firmware V1.00(AAQT.4)b8.
Affected: Emg2926 Firmware (Zyxel) versions v1.00\(aaqt.4\)b8. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 8, 2020 and is known to be used in ransomware campaigns.
Yes. It was added on Sep 18, 2023 with a federal remediation due date of Oct 9, 2023.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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