CVE-2021-45603 [Medium] | Information Disclosure in D7800 Firmware

Certain NETGEAR devices are affected by disclosure of sensitive information. A UPnP request reveals a device's serial number, which can be used for a password reset. This affects D7800 before 1.0.1.66, EX2700 before 1.0.1.68, WN3000RPv2 before 1.0.0.90, WN3000RPv3 before 1.0.2.100, LBR1020 before 2.6.5.20, LBR20 before 2.6.5.32, R6700AX before 1.0.10.110, R7800 before 1.0.2.86, R8900 before 1.0.5.38, R9000 before 1.0.5.38, RAX10 before 1.0.10.110, RAX120v1 before 1.2.3.28, RAX120v2 before 1.2.3.28, RAX70 before 1.0.10.110, RAX78 before 1.0.10.110, XR450 before 2.3.2.130, XR500 before 2.3.2.130, and XR700 before 1.0.1.46.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.04%	0.58%	+0.54%
2	2025-11-21	0.06%	0.04%	-0.02%
3	2025-11-18	—	0.06%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.04%

0.58%

+0.54%

2025-11-21

0.06%

0.04%

-0.02%

2025-11-18

—

0.06%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) A normal user session is enough; they don’t have to be admin. 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:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.8	4.2	[email protected]
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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:L) A normal user session is enough; they don’t have to be admin. 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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	1.8	3.6	[email protected]
2.1	2.0	LOW	`AV:L/AC:L/Au:N/C:P/I:N/A:N` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:N) No availability impact.	3.9	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): A normal user session is enough; they don’t have to be admin.
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:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

1.8

4.2

[email protected]

5.5

3.1

MEDIUM

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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:L): A normal user session is enough; they don’t have to be admin.
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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

1.8

3.6

[email protected]

2.1

2.0

LOW

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

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:N): No availability impact.

3.9

2.9

[email protected]

Affected software / configurations for CVE-2021-45603

Vendor	Product	Version	Raw CPE
netgear	d7800_firmware	< 1.0.1.66	cpe:2.3:o:netgear:d7800_firmware::::::::
netgear	ex2700_firmware	< 1.0.1.68	cpe:2.3:o:netgear:ex2700_firmware::::::::
netgear	wn3000rpv2_firmware	< 1.0.0.90	cpe:2.3:o:netgear:wn3000rpv2_firmware::::::::
netgear	wn3000rpv3_firmware	< 1.0.2.100	cpe:2.3:o:netgear:wn3000rpv3_firmware::::::::
netgear	lbr1020_firmware	< 2.6.5.20	cpe:2.3:o:netgear:lbr1020_firmware::::::::
netgear	lbr20_firmware	< 2.6.5.32	cpe:2.3:o:netgear:lbr20_firmware::::::::
netgear	r6700ax_firmware	< 1.0.10.110	cpe:2.3:o:netgear:r6700ax_firmware::::::::
netgear	r7800_firmware	< 1.0.2.86	cpe:2.3:o:netgear:r7800_firmware::::::::
netgear	r8900_firmware	< 1.0.5.38	cpe:2.3:o:netgear:r8900_firmware::::::::
netgear	r9000_firmware	< 1.0.5.38	cpe:2.3:o:netgear:r9000_firmware::::::::
netgear	rax10_firmware	< 1.0.10.110	cpe:2.3:o:netgear:rax10_firmware::::::::
netgear	rax120v1_firmware	< 1.2.3.28	cpe:2.3:o:netgear:rax120v1_firmware::::::::
netgear	rax120v2_firmware	< 1.2.3.28	cpe:2.3:o:netgear:rax120v2_firmware::::::::
netgear	rax70_firmware	< 1.0.10.110	cpe:2.3:o:netgear:rax70_firmware::::::::
netgear	rax78_firmware	< 1.0.10.110	cpe:2.3:o:netgear:rax78_firmware::::::::
netgear	xr450_firmware	< 2.3.2.130	cpe:2.3:o:netgear:xr450_firmware::::::::
netgear	xr500_firmware	< 2.3.2.130	cpe:2.3:o:netgear:xr500_firmware::::::::
netgear	xr700_firmware	< 1.0.1.46	cpe:2.3:o:netgear:xr700_firmware::::::::

References for CVE-2021-45603

URL	Tags
https://immersivelabs.com/resources/blog/netgear-vulnerabilities-could-put-small-business-routers-at-risk/	Third Party Advisory
https://kb.netgear.com/000064407/Security-Advisory-for-Post-Authentication-Command-Injection-Sensitive-Information-Disclosure-on-Multiple-Products-PSV-2021-0169-PSV-2021-0171	Patch Vendor Advisory

URL

CVE-2021-45603

Exploit prediction scoring system (EPSS) score for CVE-2021-45603

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45603

Weakness enumeration for CVE-2021-45603

Affected software / configurations for CVE-2021-45603

References for CVE-2021-45603