CVE-2017-6334
CVE-2017-6334 is a security flaw in NETGEAR DGN2200 Devices, routers for homes and small offices. Someone who already has a way in can use NETGEAR DGN2200 Devices to run their own code. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 25 Mar 2022.[1]
NETGEAR DGN2200 Devices is in things households have: home and small-office routers, so the fix matters at home as much as at work.
Description
CISA calls it an OS command injection in NETGEAR DGN2200 Devices. In its words: “dnslookup.cgi on NETGEAR DGN2200 devices with firmware through 10.0.0.50 allows remote authenticated users to execute arbitrary OS commands”[1]
The CVE record adds: “dnslookup.cgi on NETGEAR DGN2200 devices with firmware through 10.0.0.50 allows remote authenticated users to execute arbitrary OS commands via shell metacharacters in the host_name field of an HTTP POST request, a different vulnerability than CVE-2017-6077.”[2]
The underlying weakness is OS command injection (CWE-78), in MITRE’s list of common software weaknesses.
It scores 8.8 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it. CISA names the product as NETGEAR DGN2200 Devices.
Every device with NETGEAR DGN2200 Devices needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 25 Mar 2022, 1,845 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 15 Apr 2022 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 73%. That’s in the top 1% of the flaws it scores.[3]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
CISA’s required action: “The impacted product is end-of-life and should be disconnected if still in use.”[1]
- Update NETGEAR DGN2200 Devices now.Open the router’s app, or its admin page in a browser, and look for a firmware update. Then turn on automatic updates, so the next fix arrives on its own.
- If the maker has stopped updating it, replace it.Routers stop getting fixes after a few years, and attackers keep a list of the ones that did. If there’s no newer firmware, it won’t be fixed.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.8.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 73%.[3] |
See also
Other NETGEAR flaws
- CVE-2017-5521, NETGEAR Multiple Devices: exposure of sensitive information ·
- CVE-2017-6862, NETGEAR Multiple Devices: buffer overflow ·
- CVE-2016-1555, NETGEAR Wireless Access Point (WAP) Devices: multiple WAP devices command injection ·
- CVE-2016-10174, NETGEAR WNR2000v5 Router: buffer overflow ·
- CVE-2017-6077, NETGEAR Wireless Router DGN2200: dGN2200 remote code execution ·
Other OS command injection flaws
- CVE-2026-110447, Collabora Online – Built-in CODE Server: online – built-in CODE server OS command injection ·
- CVE-2026-106931, EG Secure Solutions SiteGuard Server Edition: OS command injection ·
- CVE-2026-83549, SonicWall SMA1000 Appliances: OS command injection ·
- CVE-2026-49869, Kestra OSS: OSS OS command injection ·
- CVE-2026-73570, Synacor Zimbra Collaboration Suite (ZCS): OS command injection ·
Added the same day
- CVE-2022-26318, WatchGuard Firebox and XTM Appliances: arbitrary code execution ·
- CVE-2022-26143, Mitel MiCollab, MiVoice Business Express: access control ·
- CVE-2022-21999, Microsoft Windows: print spooler privilege escalation ·
- CVE-2021-42237, Sitecore XP: remote command execution ·
- CVE-2021-22941, Citrix ShareFile: improper access control ·
Every NETGEAR flaw on CISA’s list · Everything added in March 2022
References
- ^ Cybersecurity and Infrastructure Security Agency. “NETGEAR DGN2200 Devices OS Command Injection Vulnerability”. Known Exploited Vulnerabilities Catalog, added 25 Mar 2022.
- ^ National Institute of Standards and Technology. “CVE-2017-6334 Detail”. National Vulnerability Database, published 6 Mar 2017.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.726, percentile 99.4, 31 Oct 2026.
- CVE Program. “CVE-2017-6334”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.