CVE-2020-35575 [Critical] | Security Vulnerability in Wa901nd Firmware

A password-disclosure issue in the web interface on certain TP-Link devices allows a remote attacker to get full administrative access to the web panel. This affects WA901ND devices before 3.16.9(201211) beta, and Archer C5, Archer C7, MR3420, MR6400, WA701ND, WA801ND, WDR3500, WDR3600, WE843N, WR1043ND, WR1045ND, WR740N, WR741ND, WR749N, WR802N, WR840N, WR841HP, WR841N, WR842N, WR842ND, WR845N, WR940N, WR941HP, WR945N, WR949N, and WRD4300 devices.

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#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-11-26	35.57%	18.79%	-16.78%
2	2025-03-30	57.12%	35.57%	-21.56%
3	2025-03-29	—	57.12%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-11-26

35.57%

18.79%

-16.78%

2025-03-30

57.12%

35.57%

-21.56%

2025-03-29

—

57.12%

—

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]
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

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]

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-2020-35575

Vendor	Product	Version	Raw CPE
tp-link	wa901nd_firmware	< 3.16.9\(201211\)_beta	cpe:2.3:o:tp-link:wa901nd_firmware::::::::
tp-link	archer_c5_firmware	—	cpe:2.3:o:tp-link:archer_c5_firmware:-:::::::*
tp-link	archer_c7_firmware	—	cpe:2.3:o:tp-link:archer_c7_firmware:-:::::::*
tp-link	mr3420_firmware	—	cpe:2.3:o:tp-link:mr3420_firmware:-:::::::*
tp-link	mr6400_firmware	—	cpe:2.3:o:tp-link:mr6400_firmware:-:::::::*
tp-link	wa701nd_firmware	—	cpe:2.3:o:tp-link:wa701nd_firmware:-:::::::*
tp-link	wa801nd_firmware	—	cpe:2.3:o:tp-link:wa801nd_firmware:-:::::::*
tp-link	wdr3500_firmware	—	cpe:2.3:o:tp-link:wdr3500_firmware:-:::::::*
tp-link	wdr3600_firmware	—	cpe:2.3:o:tp-link:wdr3600_firmware:-:::::::*
tp-link	we843n_firmware	—	cpe:2.3:o:tp-link:we843n_firmware:-:::::::*
tp-link	wr1043nd_firmware	—	cpe:2.3:o:tp-link:wr1043nd_firmware:-:::::::*
tp-link	wr1045nd_firmware	—	cpe:2.3:o:tp-link:wr1045nd_firmware:-:::::::*
tp-link	wr740n_firmware	—	cpe:2.3:o:tp-link:wr740n_firmware:-:::::::*
tp-link	wr741nd_firmware	—	cpe:2.3:o:tp-link:wr741nd_firmware:-:::::::*
tp-link	wr749n_firmware	—	cpe:2.3:o:tp-link:wr749n_firmware:-:::::::*
tp-link	wr802n_firmware	—	cpe:2.3:o:tp-link:wr802n_firmware:-:::::::*
tp-link	wr840n_firmware	—	cpe:2.3:o:tp-link:wr840n_firmware:-:::::::*
tp-link	wr841hp_firmware	—	cpe:2.3:o:tp-link:wr841hp_firmware:-:::::::*
tp-link	wr841n_firmware	—	cpe:2.3:o:tp-link:wr841n_firmware:-:::::::*
tp-link	wr842n_firmware	—	cpe:2.3:o:tp-link:wr842n_firmware:-:::::::*
tp-link	wr842nd_firmware	—	cpe:2.3:o:tp-link:wr842nd_firmware:-:::::::*
tp-link	wr845n_firmware	—	cpe:2.3:o:tp-link:wr845n_firmware:-:::::::*
tp-link	wr940n_firmware	—	cpe:2.3:o:tp-link:wr940n_firmware:-:::::::*
tp-link	wr941hp_firmware	—	cpe:2.3:o:tp-link:wr941hp_firmware:-:::::::*
tp-link	wr945n_firmware	—	cpe:2.3:o:tp-link:wr945n_firmware:-:::::::*
tp-link	wr949n_firmware	—	cpe:2.3:o:tp-link:wr949n_firmware:-:::::::*
tp-link	wrd4300_firmware	—	cpe:2.3:o:tp-link:wrd4300_firmware:-:::::::*

References for CVE-2020-35575

URL	Tags
http://packetstormsecurity.com/files/163274/TP-Link-TL-WR841N-Command-Injection.html	Exploit Third Party Advisory VDB Entry
https://pastebin.com/F8AuUdck	Third Party Advisory
https://static.tp-link.com/2020/202012/20201214/wa901ndv5_eu_3_16_9_up_boot%28201211%29.zip
https://www.tp-link.com/us/security	Vendor Advisory

URL

CVE-2020-35575

Public exploit references (Exploit-DB) for CVE-2020-35575

Exploit prediction scoring system (EPSS) score for CVE-2020-35575

Common vulnerability scoring system (CVSS) metrics for CVE-2020-35575

Weakness enumeration for CVE-2020-35575

Affected software / configurations for CVE-2020-35575

References for CVE-2020-35575