CVE-2021-45550 [Medium] | Code Injection in D3600 Firmware

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects D3600 before 1.0.0.76, D6000 before 1.0.0.78, D6100 before 1.0.0.63, D6220 before 1.0.0.52, D6400 before 1.0.0.86, D7800 before 1.0.1.56, D8500 before 1.0.3.44, DGN2200Bv4 before 1.0.0.109, DGN2200v4 before 1.0.0.110, R6250 before 1.0.4.34, R6300v2 before 1.0.4.34, R6400 before 1.0.1.46, R6400v2 before 1.0.2.66, R6700 before 1.0.2.6, R6700v3 before 1.0.2.66, R6900 before 1.0.2.4, R6900P before 1.3.1.64, R7000 before 1.0.9.42, R7000P before 1.3.1.64, R7100LG before 1.0.0.50, R7300 before 1.0.0.70, R7900 before 1.0.3.8, R7900P before 1.4.1.30, R8000 before 1.0.4.28, R8000P before 1.4.1.30, R8300 before 1.0.2.128, R8500 before 1.0.2.128, WNDR3400v3 before 1.0.1.24, WNR3500Lv2 before 1.2.0.62, and XR500 before 2.3.2.56.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.08%	0.57%	+0.49%
2	2025-03-30	0.23%	0.08%	-0.15%
3	2025-03-29	—	0.23%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.08%

0.57%

+0.49%

2025-03-30

0.23%

0.08%

-0.15%

2025-03-29

—

0.23%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.6	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H` 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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. 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.	0.7	5.9	[email protected]
6.8	3.1	MEDIUM	`CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H` 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: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.	0.9	5.9	[email protected]
5.2	2.0	MEDIUM	`AV:A/AC:L/Au:S/C:P/I:P/A:P` Click to expand Access vector (AV:A) Requires access to an adjacent network segment. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:S) A single authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	5.1	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.6

3.1

MEDIUM

CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H 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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
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.

0.7

5.9

[email protected]

6.8

3.1

MEDIUM

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

0.9

5.9

[email protected]

5.2

2.0

MEDIUM

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

Access vector (AV:A): Requires access to an adjacent network segment.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:S): A single authentication is required.
Confidentiality impact (C:P): Partial confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:P): Partial availability impact.

5.1

6.4

[email protected]

Affected software / configurations for CVE-2021-45550

Vendor	Product	Version	Raw CPE
netgear	d3600_firmware	< 1.0.0.76	cpe:2.3:o:netgear:d3600_firmware::::::::
netgear	d6000_firmware	< 1.0.0.78	cpe:2.3:o:netgear:d6000_firmware::::::::
netgear	d6100_firmware	< 1.0.0.63	cpe:2.3:o:netgear:d6100_firmware::::::::
netgear	d6220_firmware	< 1.0.0.52	cpe:2.3:o:netgear:d6220_firmware::::::::
netgear	d6400_firmware	< 1.0.0.86	cpe:2.3:o:netgear:d6400_firmware::::::::
netgear	d7800_firmware	< 1.0.1.56	cpe:2.3:o:netgear:d7800_firmware::::::::
netgear	d8500_firmware	< 1.0.3.44	cpe:2.3:o:netgear:d8500_firmware::::::::
netgear	dgn2200b_firmware	< 1.0.0.109	cpe:2.3:o:netgear:dgn2200b_firmware::::::::
netgear	dgn2200_firmware	< 1.0.0.110	cpe:2.3:o:netgear:dgn2200_firmware::::::::
netgear	r6250_firmware	< 1.0.4.34	cpe:2.3:o:netgear:r6250_firmware::::::::
netgear	r6300_firmware	< 1.0.4.34	cpe:2.3:o:netgear:r6300_firmware::::::::
netgear	r6400_firmware	< 1.0.1.46	cpe:2.3:o:netgear:r6400_firmware::::::::
netgear	r6400_firmware	< 1.0.2.66	cpe:2.3:o:netgear:r6400_firmware::::::::
netgear	r6700_firmware	< 1.0.2.6	cpe:2.3:o:netgear:r6700_firmware::::::::
netgear	r6700_firmware	< 1.0.2.66	cpe:2.3:o:netgear:r6700_firmware::::::::
netgear	r6900_firmware	< 1.0.2.4	cpe:2.3:o:netgear:r6900_firmware::::::::
netgear	r6900p_firmware	< 1.3.1.64	cpe:2.3:o:netgear:r6900p_firmware::::::::
netgear	r7000_firmware	< 1.0.9.42	cpe:2.3:o:netgear:r7000_firmware::::::::
netgear	r7000p_firmware	< 1.3.1.64	cpe:2.3:o:netgear:r7000p_firmware::::::::
netgear	r7100lg_firmware	< 1.0.0.50	cpe:2.3:o:netgear:r7100lg_firmware::::::::
netgear	r7300_firmware	< 1.0.0.70	cpe:2.3:o:netgear:r7300_firmware::::::::
netgear	r7900_firmware	< 1.0.3.8	cpe:2.3:o:netgear:r7900_firmware::::::::
netgear	r7900p_firmware	< 1.4.1.30	cpe:2.3:o:netgear:r7900p_firmware::::::::
netgear	r8000_firmware	< 1.0.4.28	cpe:2.3:o:netgear:r8000_firmware::::::::
netgear	r8000p_firmware	< 1.4.1.30	cpe:2.3:o:netgear:r8000p_firmware::::::::
netgear	r8300_firmware	< 1.0.2.128	cpe:2.3:o:netgear:r8300_firmware::::::::
netgear	r8500_firmware	< 1.0.2.128	cpe:2.3:o:netgear:r8500_firmware::::::::
netgear	wndr3400_firmware	< 1.0.1.24	cpe:2.3:o:netgear:wndr3400_firmware::::::::
netgear	wnr3500l_firmware	< 1.2.0.62	cpe:2.3:o:netgear:wnr3500l_firmware::::::::
netgear	xr500_firmware	< 2.3.2.56	cpe:2.3:o:netgear:xr500_firmware::::::::

References for CVE-2021-45550

URL	Tags
https://kb.netgear.com/000064049/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Routers-PSV-2018-0376	Vendor Advisory

URL

CVE-2021-45550

Exploit prediction scoring system (EPSS) score for CVE-2021-45550

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45550

Weakness enumeration for CVE-2021-45550

Affected software / configurations for CVE-2021-45550

References for CVE-2021-45550