CVE-2021-45656 [High] | Security Vulnerability in D6200 Firmware

Certain NETGEAR devices are affected by server-side injection. This affects D6200 before 1.1.00.38, D7000 before 1.0.1.78, R6020 before 1.0.0.48, R6080 before 1.0.0.48, R6050 before 1.0.1.26, JR6150 before 1.0.1.26, R6120 before 1.0.0.66, R6220 before 1.1.0.100, R6230 before 1.1.0.100, R6260 before 1.1.0.78, R6800 before 1.2.0.76, R6900v2 before 1.2.0.76, R6700v2 before 1.2.0.76, R7450 before 1.2.0.76, AC2100 before 1.2.0.76, AC2400 before 1.2.0.76, AC2600 before 1.2.0.76, RBK40 before 2.5.1.16, RBR40 before 2.5.1.16, RBS40 before 2.5.1.16, RBK20 before 2.5.1.16, RBR20 before 2.5.1.16, RBS20 before 2.5.1.16, RBK50 before 2.5.1.16, RBR50 before 2.5.1.16, RBS50 before 2.5.1.16, and RBS50Y before 2.6.1.40.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.09%	0.31%	+0.22%
2	2025-03-30	0.16%	0.09%	-0.07%
3	2025-03-29	—	0.16%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.09%

0.31%

+0.22%

2025-03-30

0.16%

0.09%

-0.07%

2025-03-29

—

0.16%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:N) Service keeps running; no real outage angle.	1.8	5.2	[email protected]
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` 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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]
4.6	2.0	MEDIUM	`AV:L/AC:L/Au:N/C:P/I:P/A:P` 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:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	3.9	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.1

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N): Service keeps running; no real outage angle.

1.8

5.2

[email protected]

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H 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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

4.6

2.0

MEDIUM

AV:L/AC:L/Au:N/C:P/I:P/A:P 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:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

3.9

6.4

[email protected]

Affected software / configurations for CVE-2021-45656

Vendor	Product	Version	Raw CPE
netgear	d6200_firmware	< 1.1.00.38	cpe:2.3:o:netgear:d6200_firmware::::::::
netgear	d7000_firmware	< 1.0.1.78	cpe:2.3:o:netgear:d7000_firmware::::::::
netgear	r6020_firmware	< 1.0.0.48	cpe:2.3:o:netgear:r6020_firmware::::::::
netgear	r6080_firmware	< 1.0.0.48	cpe:2.3:o:netgear:r6080_firmware::::::::
netgear	r6050_firmware	< 1.0.1.26	cpe:2.3:o:netgear:r6050_firmware::::::::
netgear	jr6150_firmware	< 1.0.1.26	cpe:2.3:o:netgear:jr6150_firmware::::::::
netgear	r6120_firmware	< 1.0.0.66	cpe:2.3:o:netgear:r6120_firmware::::::::
netgear	r6220_firmware	< 1.1.0.100	cpe:2.3:o:netgear:r6220_firmware::::::::
netgear	r6230_firmware	< 1.1.0.110	cpe:2.3:o:netgear:r6230_firmware::::::::
netgear	r6260_firmware	< 1.1.0.78	cpe:2.3:o:netgear:r6260_firmware::::::::
netgear	r6800_firmware	< 1.2.0.76	cpe:2.3:o:netgear:r6800_firmware::::::::
netgear	r6900_firmware	< 1.2.0.76	cpe:2.3:o:netgear:r6900_firmware::::::::
netgear	r6700_firmware	< 1.2.0.76	cpe:2.3:o:netgear:r6700_firmware::::::::
netgear	r7450_firmware	< 1.2.0.76	cpe:2.3:o:netgear:r7450_firmware::::::::
netgear	ac2100_firmware	< 1.2.0.76	cpe:2.3:o:netgear:ac2100_firmware::::::::
netgear	ac2400_firmware	< 1.2.0.76	cpe:2.3:o:netgear:ac2400_firmware::::::::
netgear	ac2600_firmware	< 1.2.0.76	cpe:2.3:o:netgear:ac2600_firmware::::::::
netgear	rbk40_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbk40_firmware::::::::
netgear	rbr40_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbr40_firmware::::::::
netgear	rbs40_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbs40_firmware::::::::
netgear	rbk20_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbk20_firmware::::::::
netgear	rbr20_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbr20_firmware::::::::
netgear	rbs20_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbs20_firmware::::::::
netgear	rbk50_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbk50_firmware::::::::
netgear	rbr50_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbr50_firmware::::::::
netgear	rbs50_firmware	< 2.5.1.16	cpe:2.3:o:netgear:rbs50_firmware::::::::
netgear	rbs50y_firmware	< 2.6.1.40	cpe:2.3:o:netgear:rbs50y_firmware::::::::

References for CVE-2021-45656

URL	Tags
https://kb.netgear.com/000064066/Security-Advisory-for-Server-Side-Injection-on-Some-Routers-and-WiFi-Systems-PSV-2019-0140	Patch Vendor Advisory

URL

CVE-2021-45656

Exploit prediction scoring system (EPSS) score for CVE-2021-45656

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45656

Weakness enumeration for CVE-2021-45656

Affected software / configurations for CVE-2021-45656

References for CVE-2021-45656