CVE-2021-45642 [High] | Security Vulnerability in D7800 Firmware

Certain NETGEAR devices are affected by incorrect configuration of security settings. This affects D7800 before 1.0.1.64, EX6250 before 1.0.0.134, EX7700 before 1.0.0.222, LBR20 before 2.6.3.50, RBS50Y before 2.7.3.22, R8900 before 1.0.5.26, R9000 before 1.0.5.26, XR450 before 2.3.2.66, XR500 before 2.3.2.66, XR700 before 1.0.1.36, EX7320 before 1.0.0.134, RAX120 before 1.2.2.24, EX7300v2 before 1.0.0.134, RAX120v2 before 1.2.2.24, EX6410 before 1.0.0.134, RBR10 before 2.7.3.22, RBR20 before 2.7.3.22, RBR40 before 2.7.3.22, RBR50 before 2.7.3.22, EX6420 before 1.0.0.134, RBS10 before 2.7.3.22, RBS20 before 2.7.3.22, RBS40 before 2.7.3.22, RBS50 before 2.7.3.22, EX6400v2 before 1.0.0.134, 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	0.52%	0.94%	+0.42%
2	2025-03-30	1.00%	0.52%	-0.48%
3	2025-03-29	—	1.00%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.52%

0.94%

+0.42%

2025-03-30

1.00%

0.52%

-0.48%

2025-03-29

—

1.00%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.5	3.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:L` 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. 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.	1.7	5.3	[email protected]
7.2	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:H/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: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.	1.2	5.9	[email protected]
7.5	2.0	HIGH	`AV:N/AC:L/Au:N/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:N) No authentication is required. Confidentiality impact (C:P) Partial confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:P) Partial availability impact.	10.0	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.5

3.1

HIGH

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:L/I:H/A:L 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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
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.

1.7

5.3

[email protected]

7.2

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/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: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.

1.2

5.9

[email protected]

7.5

2.0

HIGH

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

10.0

6.4

[email protected]

Affected software / configurations for CVE-2021-45642

Vendor	Product	Version	Raw CPE
netgear	d7800_firmware	< 1.0.1.64	cpe:2.3:o:netgear:d7800_firmware::::::::
netgear	ex6250_firmware	< 1.0.0.134	cpe:2.3:o:netgear:ex6250_firmware::::::::
netgear	ex7700_firmware	< 1.0.0.222	cpe:2.3:o:netgear:ex7700_firmware::::::::
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	rbs50_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs50_firmware::::::::
netgear	rbs20_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs20_firmware::::::::
netgear	rbs10_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs10_firmware::::::::
netgear	rbs40_firmware	< 2.7.3.22	cpe:2.3:o:netgear:rbs40_firmware::::::::
netgear	r8900_firmware	< 1.0.5.26	cpe:2.3:o:netgear:r8900_firmware::::::::
netgear	r9000_firmware	< 1.0.5.26	cpe:2.3:o:netgear:r9000_firmware::::::::
netgear	xr450_firmware	< 2.3.2.66	cpe:2.3:o:netgear:xr450_firmware::::::::
netgear	xr500_firmware	< 2.3.2.66	cpe:2.3:o:netgear:xr500_firmware::::::::
netgear	xr700_firmware	< 1.0.1.36	cpe:2.3:o:netgear:xr700_firmware::::::::
netgear	ex7320_firmware	< 1.0.0.134	cpe:2.3:o:netgear:ex7320_firmware::::::::
netgear	rax120_firmware	< 1.2.2.24	cpe:2.3:o:netgear:rax120_firmware::::::::
netgear	ex7300v2_firmware	< 1.0.0.134	cpe:2.3:o:netgear:ex7300v2_firmware::::::::
netgear	rax120v2_firmware	< 1.2.2.24	cpe:2.3:o:netgear:rax120v2_firmware::::::::
netgear	ex6410_firmware	< 1.0.0.134	cpe:2.3:o:netgear:ex6410_firmware::::::::
netgear	ex6420_firmware	< 1.0.0.134	cpe:2.3:o:netgear:ex6420_firmware::::::::
netgear	ex6400v2_firmware	< 1.0.0.134	cpe:2.3:o:netgear:ex6400v2_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	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-2021-45642

URL	Tags
https://kb.netgear.com/000064491/Security-Advisory-for-Security-Misconfiguration-on-Some-Routers-Extenders-and-WiFi-Systems-PSV-2020-0427	Patch Vendor Advisory

URL

CVE-2021-45642

Exploit prediction scoring system (EPSS) score for CVE-2021-45642

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45642

Weakness enumeration for CVE-2021-45642

Affected software / configurations for CVE-2021-45642

References for CVE-2021-45642