CVE-2017-18777 [High] | Security Vulnerability in D6220 Firmware

Certain NETGEAR devices are affected by administrative password disclosure. This affects D6220 before V1.0.0.28, D6400 before V1.0.0.60, D8500 before V1.0.3.29, DGN2200v4 before 1.0.0.82, DGN2200Bv4 before 1.0.0.82, R6300v2 before 1.0.4.8, R6400 before 1.0.1.20, R6700 before 1.0.1.20, R6900 before 1.0.1.20, R7000 before 1.0.7.10, R7100LG before V1.0.0.32, R7300DST before 1.0.0.52, R7900 before 1.0.1.16, R8000 before 1.0.3.36, R8300 before 1.0.2.94, R8500 before 1.0.2.94, WNDR3400v3 before 1.0.1.12, and WNR3500Lv2 before 1.2.0.40.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.05%	0.28%	+0.23%
2	2025-03-17	0.04%	0.05%	+0.01%
3	2023-03-07	—	0.04%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.05%

0.28%

+0.23%

2025-03-17

0.04%

0.05%

+0.01%

2023-03-07

—

0.04%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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.	1.8	5.9	[email protected]
8.4	3.0	HIGH	`CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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.	2.5	5.9	[email protected]
2.1	2.0	LOW	`AV:L/AC:L/Au:N/C:P/I:N/A:N` Click to expand Access vector (AV:L) Requires local access to the target system. 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:N) No integrity impact. Availability impact (A:N) No availability impact.	3.9	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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.

1.8

5.9

[email protected]

8.4

3.0

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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.

2.5

5.9

[email protected]

2.1

2.0

LOW

AV:L/AC:L/Au:N/C:P/I:N/A:N Click to expand

Access vector (AV:L): Requires local access to the target system.
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:N): No integrity impact.
Availability impact (A:N): No availability impact.

3.9

2.9

[email protected]

Affected software / configurations for CVE-2017-18777

Vendor	Product	Version	Raw CPE
netgear	d6220_firmware	< 1.0.0.28	cpe:2.3:o:netgear:d6220_firmware::::::::
netgear	d6400_firmware	< 1.0.0.60	cpe:2.3:o:netgear:d6400_firmware::::::::
netgear	d8500_firmware	< 1.0.3.29	cpe:2.3:o:netgear:d8500_firmware::::::::
netgear	dgn2200_firmware	< 1.0.0.82	cpe:2.3:o:netgear:dgn2200_firmware::::::::
netgear	dgn2200b_firmware	< 1.0.0.82	cpe:2.3:o:netgear:dgn2200b_firmware::::::::
netgear	r6300_firmware	< 1.0.4.8	cpe:2.3:o:netgear:r6300_firmware::::::::
netgear	r6400_firmware	< 1.0.1.20	cpe:2.3:o:netgear:r6400_firmware::::::::
netgear	r6700_firmware	< 1.0.1.20	cpe:2.3:o:netgear:r6700_firmware::::::::
netgear	r6900_firmware	< 1.0.1.20	cpe:2.3:o:netgear:r6900_firmware::::::::
netgear	r7000_firmware	< 1.0.7.10	cpe:2.3:o:netgear:r7000_firmware::::::::
netgear	r7100lg_firmware	< 1.0.0.32	cpe:2.3:o:netgear:r7100lg_firmware::::::::
netgear	r7300dst_firmware	< 1.0.0.52	cpe:2.3:o:netgear:r7300dst_firmware::::::::
netgear	r7900_firmware	< 1.0.1.16	cpe:2.3:o:netgear:r7900_firmware::::::::
netgear	r8000_firmware	< 1.0.3.36	cpe:2.3:o:netgear:r8000_firmware::::::::
netgear	r8300_firmware	< 1.0.2.94	cpe:2.3:o:netgear:r8300_firmware::::::::
netgear	r8500_firmware	< 1.0.2.94	cpe:2.3:o:netgear:r8500_firmware::::::::
netgear	wndr3400_firmware	< 1.0.1.12	cpe:2.3:o:netgear:wndr3400_firmware::::::::
netgear	wnr3500l_firmware	< 1.2.0.40	cpe:2.3:o:netgear:wnr3500l_firmware::::::::

References for CVE-2017-18777

URL	Tags
https://kb.netgear.com/000049551/Security-Advisory-for-Administrative-Password-Disclosure-on-Some-Routers-and-Gateways-PSV-2017-0385	Vendor Advisory

URL

CVE-2017-18777

Exploit prediction scoring system (EPSS) score for CVE-2017-18777

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18777

Weakness enumeration for CVE-2017-18777

Affected software / configurations for CVE-2017-18777

References for CVE-2017-18777