CVE-2021-45595 [High] | Code Injection in Lbr20 Firmware

Certain NETGEAR devices are affected by command injection by an authenticated user. This affects LBR20 before 2.6.3.50, RBS50Y before 2.7.3.22, RBR10 before 2.7.3.22, RBR20 before 2.7.3.22, RBR40 before 2.7.3.22, RBR50 before 2.7.3.22, RBS10 before 2.7.3.22, RBS20 before 2.7.3.22, RBS40 before 2.7.3.22, RBS50 before 2.7.3.22, RBK12 before 2.7.3.22, RBK20 before 2.7.3.22, RBK40 before 2.7.3.22, and RBK50 before 2.7.3.22.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.25%	1.60%	+1.36%
2	2026-01-02	0.15%	0.25%	+0.10%
3	2025-12-16	—	0.15%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.25%

1.60%

+1.36%

2026-01-02

0.15%

0.25%

+0.10%

2025-12-16

—

0.15%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.6	3.1	HIGH	`CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. 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.	1.0	6.0	[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

7.6

3.1

HIGH

CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:C/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
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.

1.0

6.0

[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-2021-45595

Vendor	Product	Version	Raw CPE
netgear	lbr20_firmware	< 2.6.3.50	cpe:2.3:o:netgear:lbr20_firmware::::::::
netgear	rbs50y_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs50y_firmware::::::::
netgear	rbr10_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbr10_firmware::::::::
netgear	rbr20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbr20_firmware::::::::
netgear	rbr40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbr40_firmware::::::::
netgear	rbr50_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbr50_firmware::::::::
netgear	rbs10_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs10_firmware::::::::
netgear	rbs20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs20_firmware::::::::
netgear	rbs40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs40_firmware::::::::
netgear	rbs50_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs50_firmware::::::::
netgear	rbk12_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbk12_firmware::::::::
netgear	rbk20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbk20_firmware::::::::
netgear	rbk40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbk40_firmware::::::::
netgear	rbk50_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbk50_firmware::::::::

References for CVE-2021-45595

URL	Tags
https://kb.netgear.com/000064495/Security-Advisory-for-Post-Authentication-Command-Injection-on-Some-WiFi-Systems-PSV-2020-0462	Vendor Advisory

URL

CVE-2021-45595

Exploit prediction scoring system (EPSS) score for CVE-2021-45595

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45595

Weakness enumeration for CVE-2021-45595

Affected software / configurations for CVE-2021-45595

References for CVE-2021-45595