CVE-2021-35055 [High] | Out-of-bounds Write in Mt7603e Firmware

MediaTek microchips, as used in NETGEAR devices through 2021-11-11 and other devices, mishandle the WPS (Wi-Fi Protected Setup) protocol. (Affected Chipsets MT7603E, MT7610, MT7612, MT7613, MT7615, MT7620, MT7622, MT7628, MT7629, MT7915; Affected Software Versions 7.4.0.0; Out-of-bounds write).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-03-17	0.36%	0.55%	+0.18%
2	2025-12-16	0.55%	0.36%	-0.18%
3	2025-11-21	—	0.55%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-03-17

0.36%

0.55%

+0.18%

2025-12-16

0.55%

0.36%

-0.18%

2025-11-21

—

0.55%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
8.2	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L` 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:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	4.2	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. 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]
9.3	2.0	HIGH	`AV:N/AC:M/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:M) Exploitation needs some favorable conditions, but not exceptional ones. 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.	8.6	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

8.2

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L 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:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

4.2

[email protected]

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
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]

9.3

2.0

HIGH

AV:N/AC:M/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:M): Exploitation needs some favorable conditions, but not exceptional ones.
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.

8.6

10.0

[email protected]

Affected software / configurations for CVE-2021-35055

Vendor	Product	Version	Raw CPE
mediatek	mt7603e_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7603e_firmware:7.4.0.0:::::::*
mediatek	mt7612_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7612_firmware:7.4.0.0:::::::*
mediatek	mt7613_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7613_firmware:7.4.0.0:::::::*
mediatek	mt7615_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7615_firmware:7.4.0.0:::::::*
mediatek	mt7622_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7622_firmware:7.4.0.0:::::::*
mediatek	mt7628_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7628_firmware:7.4.0.0:::::::*
mediatek	mt7629_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7629_firmware:7.4.0.0:::::::*
mediatek	mt7915_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7915_firmware:7.4.0.0:::::::*
mediatek	mt7620_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7620_firmware:7.4.0.0:::::::*
mediatek	mt7610_firmware	7.4.0.0	cpe:2.3:o:mediatek:mt7610_firmware:7.4.0.0:::::::*

References for CVE-2021-35055

URL	Tags
https://corp.mediatek.com/product-security-bulletin/January-2022	Vendor Advisory
https://kb.netgear.com/000064368/Security-Advisory-for-WiFi-WPS-and-IEEE-1905-Vulnerabilities-on-Multiple-Products-PSV-2021-0298-PSV-2021-0300	Third Party Advisory

URL

CVE-2021-35055

Exploit prediction scoring system (EPSS) score for CVE-2021-35055

Common vulnerability scoring system (CVSS) metrics for CVE-2021-35055

Weakness enumeration for CVE-2021-35055

Affected software / configurations for CVE-2021-35055

References for CVE-2021-35055