CVE-2020-35796 [High] | Memory Corruption in Cbr40 Firmware

Certain NETGEAR devices are affected by a buffer overflow by an unauthenticated attacker. This affects CBR40 before 2.5.0.10, D6220 before 1.0.0.60, D6400 before 1.0.0.94, D7000v2 before 1.0.0.62, D8500 before 1.0.3.50, DC112A before 1.0.0.48, DGN2200v4 before 1.0.0.114, EAX20 before 1.0.0.36, EAX80 before 1.0.1.62, EX3700 before 1.0.0.84, EX3800 before 1.0.0.84, EX3920 before 1.0.0.84, EX6000 before 1.0.0.44, EX6100 before 1.0.2.28, EX6120 before 1.0.0.54, EX6130 before 1.0.0.36, EX6150 before 1.0.0.46, EX6200 before 1.0.3.94, EX6920 before 1.0.0.54, EX7000 before 1.0.1.90, EX7500 before 1.0.0.68, MK62 before 1.0.5.102, MR60 before 1.0.5.102, MS60 before 1.0.5.102, R6250 before 1.0.4.42, R6300v2 before 1.0.4.42, R6400 before 1.0.1.62, R6400v2 before 1.0.4.98, R6700v3 before 1.0.4.98, R6700 before 1.0.2.16, R6900P before 1.3.2.124, R6900 before 1.0.2.16, R7000 before 1.0.11.106, R7000P before 1.3.2.124, R7100LG before 1.0.0.56, R7850 before 1.0.5.60, R7900 before 1.0.4.26, R7900P before 1.4.1.62, R7960P before 1.4.1.62, R8000 before 1.0.4.58, R8000P before 1.4.1.62, R8300 before 1.0.2.134, R8500 before 1.0.2.134, RAX15 before 1.0.1.64, RAX20 before 1.0.1.64, RAX200 before 1.0.2.102, RAX45 before 1.0.2.32, RAX50 before 1.0.2.32, RAX75 before 1.0.3.102, RAX80 before 1.0.3.102, RBK752 before 3.2.16.6, RBR750 before 3.2.16.6, RBS750 before 3.2.16.6, RBK842 before 3.2.16.6, RBR840 before 3.2.16.6, RBS840 before 3.2.16.6, RBK852 before 3.2.16.6, RBR850 before 3.2.16.6, RBS850 before 3.2.16.6, RBS40V-200 before 1.0.0.46, RBW30 before 2.5.0.4, RS400 before 1.5.0.48, WN2500RPv2 before 1.0.1.56, WN3500RP before 1.0.0.28, WNDR3400v3 before 1.0.1.32, WNR1000v3 before 1.0.2.78, WNR2000v2 before 1.2.0.12, WNR3500Lv2 before 1.2.0.62, and XR300 before 1.0.3.50.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-03-30	2.84%	1.40%	-1.44%
2	2025-03-29	1.40%	2.84%	+1.44%
3	2025-03-17	—	1.40%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-03-30

2.84%

1.40%

-1.44%

2025-03-29

1.40%

2.84%

+1.44%

2025-03-17

—

1.40%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.8	3.1	HIGH	`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/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: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.	2.8	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

8.8

3.1

HIGH

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

2.8

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-2020-35796

Vendor	Product	Version	Raw CPE
netgear	cbr40_firmware	< 2.5.0.10	cpe:2.3:o:netgear:cbr40_firmware::::::::
netgear	d6220_firmware	< 1.0.0.60	cpe:2.3:o:netgear:d6220_firmware::::::::
netgear	d6400_firmware	< 1.0.0.94	cpe:2.3:o:netgear:d6400_firmware::::::::
netgear	d7000v2_firmware	< 1.0.0.62	cpe:2.3:o:netgear:d7000v2_firmware::::::::
netgear	d8500_firmware	< 1.0.3.50	cpe:2.3:o:netgear:d8500_firmware::::::::
netgear	dc112a_firmware	< 1.0.0.48	cpe:2.3:o:netgear:dc112a_firmware::::::::
netgear	dgn2200v4_firmware	< 1.0.0.114	cpe:2.3:o:netgear:dgn2200v4_firmware::::::::
netgear	eax20_firmware	< 1.0.0.36	cpe:2.3:o:netgear:eax20_firmware::::::::
netgear	eax80_firmware	< 1.0.1.62	cpe:2.3:o:netgear:eax80_firmware::::::::
netgear	ex3700_firmware	< 1.0.0.84	cpe:2.3:o:netgear:ex3700_firmware::::::::
netgear	ex3800_firmware	< 1.0.0.84	cpe:2.3:o:netgear:ex3800_firmware::::::::
netgear	ex3920_firmware	< 1.0.0.84	cpe:2.3:o:netgear:ex3920_firmware::::::::
netgear	ex6000_firmware	< 1.0.0.44	cpe:2.3:o:netgear:ex6000_firmware::::::::
netgear	ex6100_firmware	< 1.0.2.28	cpe:2.3:o:netgear:ex6100_firmware::::::::
netgear	ex6120_firmware	< 1.0.0.54	cpe:2.3:o:netgear:ex6120_firmware::::::::
netgear	ex6130_firmware	< 1.0.0.36	cpe:2.3:o:netgear:ex6130_firmware::::::::
netgear	ex6150_firmware	< 1.0.0.46	cpe:2.3:o:netgear:ex6150_firmware::::::::
netgear	ex6200_firmware	< 1.0.3.94	cpe:2.3:o:netgear:ex6200_firmware::::::::
netgear	ex6920_firmware	< 1.0.0.54	cpe:2.3:o:netgear:ex6920_firmware::::::::
netgear	ex7000_firmware	< 1.0.1.90	cpe:2.3:o:netgear:ex7000_firmware::::::::
netgear	ex7500_firmware	< 1.0.0.68	cpe:2.3:o:netgear:ex7500_firmware::::::::
netgear	mk62_firmware	< 1.0.5.102	cpe:2.3:o:netgear:mk62_firmware::::::::
netgear	mr60_firmware	< 1.0.5.102	cpe:2.3:o:netgear:mr60_firmware::::::::
netgear	ms60_firmware	< 1.0.5.102	cpe:2.3:o:netgear:ms60_firmware::::::::
netgear	r6250_firmware	< 1.0.4.42	cpe:2.3:o:netgear:r6250_firmware::::::::
netgear	r6300v2_firmware	< 1.0.4.42	cpe:2.3:o:netgear:r6300v2_firmware::::::::
netgear	r6400_firmware	< 1.0.1.62	cpe:2.3:o:netgear:r6400_firmware::::::::
netgear	r6400v2_firmware	< 1.0.4.98	cpe:2.3:o:netgear:r6400v2_firmware::::::::
netgear	r6700v3_firmware	< 1.0.4.98	cpe:2.3:o:netgear:r6700v3_firmware::::::::
netgear	r6700_firmware	< 1.0.2.16	cpe:2.3:o:netgear:r6700_firmware::::::::
netgear	r6900p_firmware	< 1.3.2.124	cpe:2.3:o:netgear:r6900p_firmware::::::::
netgear	r6900_firmware	< 1.0.2.16	cpe:2.3:o:netgear:r6900_firmware::::::::
netgear	r7000_firmware	< 1.0.11.106	cpe:2.3:o:netgear:r7000_firmware::::::::
netgear	r7000p_firmware	< 1.3.2.124	cpe:2.3:o:netgear:r7000p_firmware::::::::
netgear	r7100lg_firmware	< 1.0.0.56	cpe:2.3:o:netgear:r7100lg_firmware::::::::
netgear	r7850_firmware	< 1.0.5.60	cpe:2.3:o:netgear:r7850_firmware::::::::
netgear	r7900_firmware	< 1.0.4.26	cpe:2.3:o:netgear:r7900_firmware::::::::
netgear	r7900p_firmware	< 1.4.1.62	cpe:2.3:o:netgear:r7900p_firmware::::::::
netgear	r7960p_firmware	< 1.4.1.62	cpe:2.3:o:netgear:r7960p_firmware::::::::
netgear	r8000_firmware	< 1.0.4.58	cpe:2.3:o:netgear:r8000_firmware::::::::
netgear	r8000p_firmware	< 1.4.1.62	cpe:2.3:o:netgear:r8000p_firmware::::::::
netgear	r8300_firmware	< 1.0.2.134	cpe:2.3:o:netgear:r8300_firmware::::::::
netgear	r8500_firmware	< 1.0.2.134	cpe:2.3:o:netgear:r8500_firmware::::::::
netgear	rax15_firmware	< 1.0.1.64	cpe:2.3:o:netgear:rax15_firmware::::::::
netgear	rax20_firmware	< 1.0.1.64	cpe:2.3:o:netgear:rax20_firmware::::::::
netgear	rax200_firmware	< 1.0.2.102	cpe:2.3:o:netgear:rax200_firmware::::::::
netgear	rx45_firmware	< 1.0.2.32	cpe:2.3:o:netgear:rx45_firmware::::::::
netgear	rax50_firmware	< 1.0.2.32	cpe:2.3:o:netgear:rax50_firmware::::::::
netgear	rax75_firmware	< 1.0.3.102	cpe:2.3:o:netgear:rax75_firmware::::::::
netgear	rax80_firmware	< 1.0.3.102	cpe:2.3:o:netgear:rax80_firmware::::::::
netgear	rbk752_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbk752_firmware::::::::
netgear	rbr750_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbr750_firmware::::::::
netgear	rbs750_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbs750_firmware::::::::
netgear	rbk842_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbk842_firmware::::::::
netgear	rbr840_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbr840_firmware::::::::
netgear	rbs840_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbs840_firmware::::::::
netgear	rbk852_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbk852_firmware::::::::
netgear	rbr850_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbr850_firmware::::::::
netgear	rbs850_firmware	< 3.2.16.6	cpe:2.3:o:netgear:rbs850_firmware::::::::
netgear	rbs40v-200_firmware	< 1.0.0.46	cpe:2.3:o:netgear:rbs40v-200_firmware::::::::
netgear	rbw30_firmware	< 2.5.0.4	cpe:2.3:o:netgear:rbw30_firmware::::::::
netgear	rs400_firmware	< 1.5.0.48	cpe:2.3:o:netgear:rs400_firmware::::::::
netgear	wn2500rpv2_firmware	< 1.0.1.56	cpe:2.3:o:netgear:wn2500rpv2_firmware::::::::
netgear	wn3500rp_firmware	< 1.0.0.28	cpe:2.3:o:netgear:wn3500rp_firmware::::::::
netgear	wndr3400v3_firmware	< 1.0.1.32	cpe:2.3:o:netgear:wndr3400v3_firmware::::::::
netgear	wnr1000v3_firmware	< 1.0.2.78	cpe:2.3:o:netgear:wnr1000v3_firmware::::::::
netgear	wnr2000v2_firmware	< 1.2.0.12	cpe:2.3:o:netgear:wnr2000v2_firmware::::::::
netgear	wnr3500lv2_firmware	< 1.2.0.62	cpe:2.3:o:netgear:wnr3500lv2_firmware::::::::
netgear	xr300_firmware	< 1.0.3.50	cpe:2.3:o:netgear:xr300_firmware::::::::

References for CVE-2020-35796

URL	Tags
https://kb.netgear.com/000062717/Security-Advisory-for-Pre-Authentication-Buffer-Overflow-on-Some-Routers-Range-Extenders-and-WiFi-Systems-PSV-2020-0201	Vendor Advisory

URL

CVE-2020-35796

Exploit prediction scoring system (EPSS) score for CVE-2020-35796

Common vulnerability scoring system (CVSS) metrics for CVE-2020-35796

Weakness enumeration for CVE-2020-35796

Affected software / configurations for CVE-2020-35796

References for CVE-2020-35796