ExploitedIn CISA KEV

CVE-2017-5521

Exploitation confirmed. First attested on 2022-09-08 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

Published2017-01-17

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered on NETGEAR R8500, R8300, R7000, R6400, R7300, R7100LG, R6300v2, WNDR3400v3, WNR3500Lv2, R6250, R6700, R6900, and R8000 devices. They are prone to password disclosure via simple crafted requests to the web management server. The bug is exploitable remotely if the remote management option is set, and can also be exploited given access to the router over LAN or WLAN. When trying to access the web panel, a user is asked to authenticate; if the authentication is canceled and password recovery is not enabled, the user is redirected to a page that exposes a password recovery token. If a user supplies the correct token to the page /passwordrecovered.cgi?id=TOKEN (and password recovery is not enabled), they will receive the admin password for the router. If password recovery is set the exploit will fail, as it will ask the user for the recovery questions that were previously set when enabling that feature. This is persistent (even after disabling the recovery option, the exploit will fail) because the router will ask for the security questions.

Timeline

dates in UTC

2017-01-1709:59CVE publishedNVD
2022-09-08Added to the CISA KEV catalogCISA KEV
2022-09-08Listed as exploited by GCVEGCVE
2022-09-08Exploitation first reportedCISA KEV
2025-02-0420:47SSVC exploitation set to activeCISA-ADP
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-5521?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-5521?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Netgear ac1450 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.0	= 1.0.0.34_10.0.16	no fix published	NVD

Netgear d6220 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.0	= 1.0.0.12	no fix published	NVD

Netgear d6300 firmwareversion to verify

Branch	Affected	Fixed in	Source
1.0	= 1.0.0.96	no fix published	NVD

10 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions. If the affected device has since entered end-of-life, it should be disconnected if still in use.due 2022-09-29

Advisories and patches

kb.netgear.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

CISA Known Exploited Vulnerability

Date Added: 2022-09-08
Patch Due Date: 2022-09-29
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions. If the affected device has since entered end-of-life, it should be disconnected if still in use.

Sources

CISA KEVKEV entry2022-09-08
GCVEexploitation2022-09-08
CISA-ADPSSVC decisionactive2025-02-04
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.18.12025-02-04
NVDCVSS 3.18.1read 2026-10-23
NVDCVSS 2.04.3read 2026-10-23
FIRST EPSSEPSS score89.4 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2017-01-17
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-5521?

Is CVE-2017-5521 actively exploited?

Yes. CVE-2017-5521 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-09-29.

What is the CVSS score for CVE-2017-5521?

CVE-2017-5521 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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