CVE-2021-45548 [Medium] | Code Injection in D7800 Firmware

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects D7800 before 1.0.1.60, DM200 before 1.0.0.66, EX2700 before 1.0.1.56, EX6150v2 before 1.0.1.86, EX6200v2 before 1.0.1.86, EX6250 before 1.0.0.128, EX6400 before 1.0.2.144, EX6400v2 before 1.0.0.128, EX6410 before 1.0.0.128, EX6420 before 1.0.0.128, EX7300 before 1.0.2.144, EX7300v2 before 1.0.0.128, EX7320 before 1.0.0.128, R7500v2 before 1.0.3.46, R7800 before 1.0.2.74, R8900 before 1.0.5.26, R9000 before 1.0.5.2, RAX120 before 1.0.1.128, WN3000RPv2 before 1.0.0.78, WN3000RPv3 before 1.0.2.80, WNR2000v5 before 1.0.0.74, XR500 before 2.3.2.66, RBK20 before 2.7.3.22, RBR20 before 2.7.3.22, RBS20 before 2.7.3.22, RBK40 before 2.7.3.22, RBR40 before 2.7.3.22, and RBS40 before 2.7.3.22.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.82%	0.95%	+0.14%
2	2025-12-16	0.34%	0.82%	+0.47%
3	2025-11-21	—	0.34%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.82%

0.95%

+0.14%

2025-12-16

0.34%

0.82%

+0.47%

2025-11-21

—

0.34%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.3	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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: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:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	0.8	5.5	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` 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: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.	2.8	5.9	[email protected]
6.5	2.0	MEDIUM	`AV:N/AC:L/Au:S/C:P/I:P/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. 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.	8.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.3

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/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: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:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

0.8

5.5

[email protected]

8.8

3.1

HIGH

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

2.8

5.9

[email protected]

6.5

2.0

MEDIUM

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

Access vector (AV:N): Can be exploited remotely over network reachability.
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.

8.0

6.4

[email protected]

Affected software / configurations for CVE-2021-45548

Vendor	Product	Version	Raw CPE
netgear	d7800_firmware	< 1.0.1.60	cpe:2.3:o:netgear:d7800_firmware::::::::
netgear	dm200_firmware	< 1.0.0.66	cpe:2.3:o:netgear:dm200_firmware::::::::
netgear	ex2700_firmware	< 1.0.1.56	cpe:2.3:o:netgear:ex2700_firmware::::::::
netgear	ex6150v2_firmware	< 1.0.1.86	cpe:2.3:o:netgear:ex6150v2_firmware::::::::
netgear	ex6200v2_firmware	< 1.0.1.86	cpe:2.3:o:netgear:ex6200v2_firmware::::::::
netgear	ex6250_firmware	< 1.0.0.128	cpe:2.3:o:netgear:ex6250_firmware::::::::
netgear	ex6400_firmware	< 1.0.2.144	cpe:2.3:o:netgear:ex6400_firmware::::::::
netgear	ex6400v2_firmware	< 1.0.0.128	cpe:2.3:o:netgear:ex6400v2_firmware::::::::
netgear	ex6410_firmware	< 1.0.0.128	cpe:2.3:o:netgear:ex6410_firmware::::::::
netgear	ex6420_firmware	< 1.0.0.128	cpe:2.3:o:netgear:ex6420_firmware::::::::
netgear	ex7300_firmware	< 1.0.2.144	cpe:2.3:o:netgear:ex7300_firmware::::::::
netgear	ex7300v2_firmware	< 1.0.0.128	cpe:2.3:o:netgear:ex7300v2_firmware::::::::
netgear	ex7320_firmware	< 1.0.0.128	cpe:2.3:o:netgear:ex7320_firmware::::::::
netgear	r7500v2_firmware	< 1.0.3.46	cpe:2.3:o:netgear:r7500v2_firmware::::::::
netgear	r7800_firmware	< 1.0.2.74	cpe:2.3:o:netgear:r7800_firmware::::::::
netgear	r8900_firmware	< 1.0.5.26	cpe:2.3:o:netgear:r8900_firmware::::::::
netgear	r9000_firmware	< 1.0.5.2	cpe:2.3:o:netgear:r9000_firmware::::::::
netgear	rax120_firmware	< 1.0.1.128	cpe:2.3:o:netgear:rax120_firmware::::::::
netgear	wn3000rpv2_firmware	< 1.0.0.78	cpe:2.3:o:netgear:wn3000rpv2_firmware::::::::
netgear	wn3000rpv3_firmware	< 1.0.2.80	cpe:2.3:o:netgear:wn3000rpv3_firmware::::::::
netgear	wnr2000v5_firmware	< 1.0.0.74	cpe:2.3:o:netgear:wnr2000v5_firmware::::::::
netgear	xr500_firmware	< 2.3.2.66	cpe:2.3:o:netgear:xr500_firmware::::::::
netgear	rbk20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbk20_firmware::::::::
netgear	rbr20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbr20_firmware::::::::
netgear	rbs20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs20_firmware::::::::
netgear	rbk40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbk40_firmware::::::::
netgear	rbr40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbr40_firmware::::::::
netgear	rbs40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs40_firmware::::::::

References for CVE-2021-45548

URL	Tags
https://kb.netgear.com/000064450/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Routers-Extenders-and-WiFi-Systems-PSV-2019-0207	Patch Vendor Advisory

URL

CVE-2021-45548

Exploit prediction scoring system (EPSS) score for CVE-2021-45548

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45548

Weakness enumeration for CVE-2021-45548

Affected software / configurations for CVE-2021-45548

References for CVE-2021-45548