CVE-2018-21167 [Medium] | XSS in D6100 Firmware

Certain NETGEAR devices are affected by stored XSS. This affects D6100 before 1.0.0.57, DM200 before 1.0.0.50, EX2700 before 1.0.1.32, EX6100v2 before 1.0.1.70, EX6150v2 before 1.0.1.70, EX6200v2 before 1.0.1.62, EX6400 before 1.0.1.78, EX7300 before 1.0.1.78, EX8000 before 1.0.0.114, R6100 before 1.0.1.22, R7500 before 1.0.0.122, R7800 before 1.0.2.42, R8900 before 1.0.3.10, R9000 before 1.0.3.10, WN2000RPTv3 before 1.0.1.26, WN3000RPv3 before 1.0.2.66, WN3100RPv2 before 1.0.0.42, WNDR3700v4 before 1.0.2.96, WNDR4300 before 1.0.2.98, WNDR4300v2 before 1.0.0.54, WNDR4500v3 before 1.0.0.54, and WNR2000v5 before 1.0.0.64.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.07%	0.80%	+0.74%
2	2025-11-21	0.29%	0.07%	-0.23%
3	2025-11-18	—	0.29%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.07%

0.80%

+0.74%

2025-11-21

0.29%

0.07%

-0.23%

2025-11-18

—

0.29%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.3	2.7	[email protected]
4.8	3.0	MEDIUM	`CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:A) Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:H) They need powerful rights—admin, root, or similar—before this pays off. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	1.7	2.7	[email protected]
3.5	2.0	LOW	`AV:N/AC:M/Au:S/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	6.8	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.3

2.7

[email protected]

4.8

3.0

MEDIUM

CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N Click to expand

Attack vector (AV:A): Attacker has to be nearby on the network—same office, same link, that vibe—not the whole wide internet.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H): They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

1.7

2.7

[email protected]

3.5

2.0

LOW

AV:N/AC:M/Au:S/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

6.8

2.9

[email protected]

Affected software / configurations for CVE-2018-21167

Vendor	Product	Version	Raw CPE
netgear	d6100_firmware	< 1.0.0.57	cpe:2.3:o:netgear:d6100_firmware::::::::
netgear	dm200_firmware	< 1.0.0.50	cpe:2.3:o:netgear:dm200_firmware::::::::
netgear	ex2700_firmware	< 1.0.1.32	cpe:2.3:o:netgear:ex2700_firmware::::::::
netgear	ex6100_firmware	< 1.0.1.70	cpe:2.3:o:netgear:ex6100_firmware::::::::
netgear	ex6150_firmware	< 1.0.1.70	cpe:2.3:o:netgear:ex6150_firmware::::::::
netgear	ex6200_firmware	< 1.0.1.62	cpe:2.3:o:netgear:ex6200_firmware::::::::
netgear	ex6400_firmware	< 1.0.1.78	cpe:2.3:o:netgear:ex6400_firmware::::::::
netgear	ex7300_firmware	< 1.0.1.78	cpe:2.3:o:netgear:ex7300_firmware::::::::
netgear	ex8000_firmware	< 1.0.0.114	cpe:2.3:o:netgear:ex8000_firmware::::::::
netgear	r6100_firmware	< 1.0.1.22	cpe:2.3:o:netgear:r6100_firmware::::::::
netgear	r7500_firmware	< 1.0.0.122	cpe:2.3:o:netgear:r7500_firmware::::::::
netgear	r7800_firmware	< 1.0.2.42	cpe:2.3:o:netgear:r7800_firmware::::::::
netgear	r8900_firmware	< 1.0.3.10	cpe:2.3:o:netgear:r8900_firmware::::::::
netgear	r9000_firmware	< 1.0.3.10	cpe:2.3:o:netgear:r9000_firmware::::::::
netgear	wn2000rpt_firmware	< 1.0.1.26	cpe:2.3:o:netgear:wn2000rpt_firmware::::::::
netgear	wn3000rp_firmware	< 1.0.2.66	cpe:2.3:o:netgear:wn3000rp_firmware::::::::
netgear	wn3100rp_firmware	< 1.0.0.42	cpe:2.3:o:netgear:wn3100rp_firmware::::::::
netgear	wndr3700_firmware	< 1.0.2.96	cpe:2.3:o:netgear:wndr3700_firmware::::::::
netgear	wndr4300_firmware	< 1.0.2.98	cpe:2.3:o:netgear:wndr4300_firmware::::::::
netgear	wndr4300_firmware	< 1.0.0.54	cpe:2.3:o:netgear:wndr4300_firmware::::::::
netgear	wndr4500_firmware	< 1.0.0.54	cpe:2.3:o:netgear:wndr4500_firmware::::::::
netgear	wnr2000_firmware	< 1.0.0.64	cpe:2.3:o:netgear:wnr2000_firmware::::::::

References for CVE-2018-21167

URL	Tags
https://kb.netgear.com/000055191/Security-Advisory-for-Stored-Cross-Site-Scripting-on-Routers-Gateways-Extenders-and-DSL-Modems-PSV-2017-3093	Vendor Advisory

URL

CVE-2018-21167

Exploit prediction scoring system (EPSS) score for CVE-2018-21167

Common vulnerability scoring system (CVSS) metrics for CVE-2018-21167

Weakness enumeration for CVE-2018-21167

Affected software / configurations for CVE-2018-21167

References for CVE-2018-21167