CVE-2019-20756 [Medium] | XSS in Ex7000 Firmware

Certain NETGEAR devices are affected by reflected XSS. This affects EX7000 before 1.0.0.64, EX6200 before 1.0.3.86, EX6150 before 1.0.0.38, EX6130 before 1.0.0.22, EX6120 before 1.0.0.40, EX6100 before 1.0.2.22, EX6000 before 1.0.0.30, EX3700 before 1.0.0.70, EX3800 before 1.0.0.70, R8300 before 1.0.2.94, R7300DST before 1.0.0.62, R7000P before 1.3.0.20, R6900P before 1.3.0.20, R6400 before 1.0.1.32, R6300v2 before 1.0.4.24, R8500 before 1.0.2.94, WNDR3400v3 before 1.0.1.18, and WN2500RPv2 before 1.0.1.52.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.44%	0.72%	+0.28%
2	2025-03-30	0.63%	0.44%	-0.19%
3	2025-03-29	—	0.63%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.44%

0.72%

+0.28%

2025-03-30

0.63%

0.44%

-0.19%

2025-03-29

—

0.63%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. 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.	2.8	2.7	[email protected]
7.1	3.0	HIGH	`CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. 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.	2.8	4.2	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/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:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
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.

2.8

2.7

[email protected]

7.1

3.0

HIGH

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/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:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
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.

2.8

4.2

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/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:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2019-20756

Vendor	Product	Version	Raw CPE
netgear	ex7000_firmware	< 1.0.0.64	cpe:2.3:o:netgear:ex7000_firmware::::::::
netgear	ex6200_firmware	< 1.0.3.86	cpe:2.3:o:netgear:ex6200_firmware::::::::
netgear	ex6150_firmware	< 1.0.0.38	cpe:2.3:o:netgear:ex6150_firmware::::::::
netgear	ex6130_firmware	< 1.0.0.22	cpe:2.3:o:netgear:ex6130_firmware::::::::
netgear	ex6120_firmware	< 1.0.0.40	cpe:2.3:o:netgear:ex6120_firmware::::::::
netgear	ex6100_firmware	< 1.0.2.22	cpe:2.3:o:netgear:ex6100_firmware::::::::
netgear	ex6000_firmware	< 1.0.0.30	cpe:2.3:o:netgear:ex6000_firmware::::::::
netgear	ex3700_firmware	< 1.0.0.70	cpe:2.3:o:netgear:ex3700_firmware::::::::
netgear	ex3800_firmware	< 1.0.0.70	cpe:2.3:o:netgear:ex3800_firmware::::::::
netgear	r8300_firmware	< 1.0.2.94	cpe:2.3:o:netgear:r8300_firmware::::::::
netgear	r7300dst_firmware	< 1.0.0.62	cpe:2.3:o:netgear:r7300dst_firmware::::::::
netgear	r7000p_firmware	< 1.3.0.20	cpe:2.3:o:netgear:r7000p_firmware::::::::
netgear	r6900p_firmware	< 1.3.0.20	cpe:2.3:o:netgear:r6900p_firmware::::::::
netgear	r6400_firmware	< 1.0.1.32	cpe:2.3:o:netgear:r6400_firmware::::::::
netgear	r6300_firmware	< 1.0.4.24	cpe:2.3:o:netgear:r6300_firmware::::::::
netgear	r8500_firmware	< 1.0.2.94	cpe:2.3:o:netgear:r8500_firmware::::::::
netgear	wndr3400_firmware	< 1.0.1.18	cpe:2.3:o:netgear:wndr3400_firmware::::::::
netgear	wn2500rp_firmware	< 1.0.1.52	cpe:2.3:o:netgear:wn2500rp_firmware::::::::

References for CVE-2019-20756

URL	Tags
https://kb.netgear.com/000060643/Security-Advisory-for-Reflected-Cross-Site-Scripting-on-Some-Routers-and-Extenders-PSV-2017-0709	Vendor Advisory

URL

CVE-2019-20756

Exploit prediction scoring system (EPSS) score for CVE-2019-20756

Common vulnerability scoring system (CVSS) metrics for CVE-2019-20756

Weakness enumeration for CVE-2019-20756

Affected software / configurations for CVE-2019-20756

References for CVE-2019-20756