CVE-2021-45617 [Critical] | Code Injection in Cbr40 Firmware

Certain NETGEAR devices are affected by command injection by an unauthenticated attacker. This affects CBR40 before 2.5.0.24, EAX20 before 1.0.0.48, EAX80 before 1.0.1.64, EX7500 before 1.0.0.72, R6400 before 1.0.1.68, R6900P before 1.3.2.132, R7000 before 1.0.11.116, R7000P before 1.3.2.132, R7900 before 1.0.4.38, R7960P before 1.4.1.66, R8000 before 1.0.4.66, RAX200 before 1.0.3.106, RS400 before 1.5.1.80, XR300 before 1.0.3.68, MK62 before 1.0.6.110, MR60 before 1.0.6.110, R6400v2 before 1.0.4.106, R8000P before 1.4.1.66, RAX20 before 1.0.2.64, RAX45 before 1.0.2.82, RAX80 before 1.0.3.106, MS60 before 1.0.6.110, R6700v3 before 1.0.4.106, R7900P before 1.4.1.66, RAX15 before 1.0.2.64, RAX50 before 1.0.2.82, RAX75 before 1.0.3.106, RBR750 before 3.2.16.22, RBR850 before 3.2.16.22, RBS750 before 3.2.16.22, RBS850 before 3.2.16.22, RBK752 before 3.2.16.22, and RBK852 before 3.2.16.22.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.53%	2.06%	+0.54%
2	2025-03-30	4.70%	1.53%	-3.18%
3	2025-03-29	—	4.70%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.53%

2.06%

+0.54%

2025-03-30

4.70%

1.53%

-3.18%

2025-03-29

—

4.70%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/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:N) No account or special rights needed—anonymous or random user is enough. 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.	3.9	5.9	[email protected]
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/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:N) No account or special rights needed—anonymous or random user is enough. 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.	3.9	5.9	[email protected]
10.0	2.0	HIGH	`AV:N/AC:L/Au:N/C:C/I:C/A:C` 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:N) No authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	10.0	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/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:N): No account or special rights needed—anonymous or random user is enough.
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.

3.9

5.9

[email protected]

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/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:N): No account or special rights needed—anonymous or random user is enough.
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.

3.9

5.9

[email protected]

10.0

2.0

HIGH

AV:N/AC:L/Au:N/C:C/I:C/A:C 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:N): No authentication is required.
Confidentiality impact (C:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

10.0

[email protected]

Affected software / configurations for CVE-2021-45617

Vendor	Product	Version	Raw CPE
netgear	cbr40_firmware	< 2.5.0.24	cpe:2.3:o:netgear:cbr40_firmware::::::::
netgear	eax20_firmware	< 1.0.0.48	cpe:2.3:o:netgear:eax20_firmware::::::::
netgear	eax80_firmware	< 1.0.1.64	cpe:2.3:o:netgear:eax80_firmware::::::::
netgear	ex7500_firmware	< 1.0.0.72	cpe:2.3:o:netgear:ex7500_firmware::::::::
netgear	r6400_firmware	< 1.0.1.68	cpe:2.3:o:netgear:r6400_firmware::::::::
netgear	r6900p_firmware	< 1.3.2.132	cpe:2.3:o:netgear:r6900p_firmware::::::::
netgear	r7000_firmware	< 1.0.11.116	cpe:2.3:o:netgear:r7000_firmware::::::::
netgear	r7000p_firmware	< 1.3.2.132	cpe:2.3:o:netgear:r7000p_firmware::::::::
netgear	r7900_firmware	< 1.0.4.38	cpe:2.3:o:netgear:r7900_firmware::::::::
netgear	r7960p_firmware	< 1.4.1.66	cpe:2.3:o:netgear:r7960p_firmware::::::::
netgear	r8000_firmware	< 1.0.4.66	cpe:2.3:o:netgear:r8000_firmware::::::::
netgear	rax200_firmware	< 1.0.3.106	cpe:2.3:o:netgear:rax200_firmware::::::::
netgear	rs400_firmware	< 1.5.1.80	cpe:2.3:o:netgear:rs400_firmware::::::::
netgear	xr300_firmware	< 1.0.3.68	cpe:2.3:o:netgear:xr300_firmware::::::::
netgear	mk62_firmware	< 1.0.6.110	cpe:2.3:o:netgear:mk62_firmware::::::::
netgear	mr60_firmware	< 1.0.6.110	cpe:2.3:o:netgear:mr60_firmware::::::::
netgear	r6400v2_firmware	< 1.0.4.106	cpe:2.3:o:netgear:r6400v2_firmware::::::::
netgear	r8000p_firmware	< 1.4.1.66	cpe:2.3:o:netgear:r8000p_firmware::::::::
netgear	rax20_firmware	< 1.0.2.64	cpe:2.3:o:netgear:rax20_firmware::::::::
netgear	rax45_firmware	< 1.0.2.82	cpe:2.3:o:netgear:rax45_firmware::::::::
netgear	rax80_firmware	< 1.0.3.106	cpe:2.3:o:netgear:rax80_firmware::::::::
netgear	ms60_firmware	< 1.0.6.110	cpe:2.3:o:netgear:ms60_firmware::::::::
netgear	r6700v3_firmware	< 1.0.4.106	cpe:2.3:o:netgear:r6700v3_firmware::::::::
netgear	r7900p_firmware	< 1.4.1.66	cpe:2.3:o:netgear:r7900p_firmware::::::::
netgear	rax15_firmware	< 1.0.2.64	cpe:2.3:o:netgear:rax15_firmware::::::::
netgear	rax50_firmware	< 1.0.2.82	cpe:2.3:o:netgear:rax50_firmware::::::::
netgear	rax75_firmware	< 1.0.3.106	cpe:2.3:o:netgear:rax75_firmware::::::::
netgear	rbr750_firmware	< 3.2.16.22	cpe:2.3:o:netgear:rbr750_firmware::::::::
netgear	rbr850_firmware	< 3.2.16.22	cpe:2.3:o:netgear:rbr850_firmware::::::::
netgear	rbs750_firmware	< 3.2.16.22	cpe:2.3:o:netgear:rbs750_firmware::::::::
netgear	rbs850_firmware	< 3.2.16.22	cpe:2.3:o:netgear:rbs850_firmware::::::::
netgear	rbk752_firmware	< 3.2.16.22	cpe:2.3:o:netgear:rbk752_firmware::::::::
netgear	rbk852_firmware	< 3.2.16.22	cpe:2.3:o:netgear:rbk852_firmware::::::::

References for CVE-2021-45617

URL	Tags
https://kb.netgear.com/000064505/Security-Advisory-for-Pre-Authentication-Command-Injection-on-Some-Routers-Extenders-and-WiFi-Systems-PSV-2020-0156	Vendor Advisory

URL

CVE-2021-45617

Exploit prediction scoring system (EPSS) score for CVE-2021-45617

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45617

Weakness enumeration for CVE-2021-45617

Affected software / configurations for CVE-2021-45617

References for CVE-2021-45617