CVE-2021-45534 [High] | Code Injection in Ac2100 Firmware

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects AC2100 before 1.2.0.88, AC2400 before 1.2.0.88, AC2600 before 1.2.0.88, D7000 before 1.0.1.82, R6220 before 1.1.0.110, R6230 before 1.1.0.110, R6260 before 1.1.0.84, R6330 before 1.1.0.84, R6350 before 1.1.0.84, R6700v2 before 1.2.0.88, R6800 before 1.2.0.88, R6850 before 1.1.0.84, R6900v2 before 1.2.0.88, R7200 before 1.2.0.88, R7350 before 1.2.0.88, R7400 before 1.2.0.88, and R7450 before 1.2.0.88.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.27%	1.09%	-0.17%
2	2025-03-30	3.81%	1.27%	-2.54%
3	2025-03-29	—	3.81%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.27%

1.09%

-0.17%

2025-03-30

3.81%

1.27%

-2.54%

2025-03-29

—

3.81%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
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]
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]
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

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]

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]

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-2021-45534

Vendor	Product	Version	Raw CPE
netgear	ac2100_firmware	< 1.2.0.88	cpe:2.3:o:netgear:ac2100_firmware::::::::
netgear	ac2400_firmware	< 1.2.0.88	cpe:2.3:o:netgear:ac2400_firmware::::::::
netgear	ac2600_firmware	< 1.2.0.88	cpe:2.3:o:netgear:ac2600_firmware::::::::
netgear	d7000_firmware	< 1.0.1.82	cpe:2.3:o:netgear:d7000_firmware::::::::
netgear	r6220_firmware	< 1.1.0.110	cpe:2.3:o:netgear:r6220_firmware::::::::
netgear	r6230_firmware	< 1.1.0.110	cpe:2.3:o:netgear:r6230_firmware::::::::
netgear	r6260_firmware	< 1.1.0.84	cpe:2.3:o:netgear:r6260_firmware::::::::
netgear	r6330_firmware	< 1.1.0.84	cpe:2.3:o:netgear:r6330_firmware::::::::
netgear	r6350_firmware	< 1.1.0.84	cpe:2.3:o:netgear:r6350_firmware::::::::
netgear	r6700v2_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r6700v2_firmware::::::::
netgear	r6800_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r6800_firmware::::::::
netgear	r6850_firmware	< 1.1.0.84	cpe:2.3:o:netgear:r6850_firmware::::::::
netgear	r6900v2_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r6900v2_firmware::::::::
netgear	r7200_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r7200_firmware::::::::
netgear	r7350_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r7350_firmware::::::::
netgear	r7400_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r7400_firmware::::::::
netgear	r7450_firmware	< 1.2.0.88	cpe:2.3:o:netgear:r7450_firmware::::::::

References for CVE-2021-45534

URL	Tags
https://immersivelabs.com/resources/blog/netgear-vulnerabilities-could-put-small-business-routers-at-risk/	Third Party Advisory
https://kb.netgear.com/000064406/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-Routers-and-DSL-Modem-Routers-PSV-2021-0172	Patch Vendor Advisory

URL

CVE-2021-45534

Exploit prediction scoring system (EPSS) score for CVE-2021-45534

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45534

Weakness enumeration for CVE-2021-45534

Affected software / configurations for CVE-2021-45534

References for CVE-2021-45534