CVE-2017-2154 [High] | Input Validation Bypass in Hanako

Untrusted search path vulnerability in Hanako 2017, Hanako 2016, Hanako 2015, Hanako Pro 3, JUST Office 3 [Standard], JUST Office 3 [Eco Print Package], JUST Office 3 & Tri-De DataProtect Package, JUST Government 3, JUST Jump Class 2, JUST Frontier 3, JUST School 6 Premium, Hanako Police 5, JUST Police 3, Hanako 2017 trial version allows remote attackers to gain privileges via a Trojan horse DLL in an unspecified directory.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-03-30	0.40%	0.30%	-0.10%
2	2025-03-29	0.30%	0.40%	+0.10%
3	2025-03-17	—	0.30%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-03-30

0.40%

0.30%

-0.10%

2025-03-29

0.30%

0.40%

+0.10%

2025-03-17

—

0.30%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.0	HIGH	`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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: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.	1.8	5.9	[email protected]
6.8	2.0	MEDIUM	`AV:N/AC:M/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:M) Exploitation needs some favorable conditions, but not exceptional ones. 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.	8.6	6.4	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.0

HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/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: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.

1.8

5.9

[email protected]

6.8

2.0

MEDIUM

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

8.6

6.4

[email protected]

Affected software / configurations for CVE-2017-2154

Vendor	Product	Version	Raw CPE
justsystems	hanako	2015	cpe:2.3:a:justsystems:hanako:2015:::::::*
justsystems	hanako	2016	cpe:2.3:a:justsystems:hanako:2016:::::::*
justsystems	hanako	2017	cpe:2.3:a:justsystems:hanako:2017:::::::*
justsystems	hanako	2017	cpe:2.3:a:justsystems:hanako:2017::::trial_version:::
justsystems	hanako_police	5	cpe:2.3:a:justsystems:hanako_police:5:::::::*
justsystems	hanako_pro	3	cpe:2.3:a:justsystems:hanako_pro:3:::::::*
justsystems	just_frontier	3	cpe:2.3:a:justsystems:just_frontier:3:::::::*
justsystems	just_government	3	cpe:2.3:a:justsystems:just_government:3:::::::*
justsystems	just_jump_class	2	cpe:2.3:a:justsystems:just_jump_class:2:::::::*
justsystems	just_office	3	cpe:2.3:a:justsystems:just_office:3::::eco_print_pack:::
justsystems	just_office	3	cpe:2.3:a:justsystems:just_office:3::::standard:::
justsystems	just_office	3	cpe:2.3:a:justsystems:just_office:3::::tri-de_dataprotect_pack:::
justsystems	just_police	3	cpe:2.3:a:justsystems:just_police:3:::::::*
justsystems	just_school	6	cpe:2.3:a:justsystems:just_school:6:::::::*
justsystems	just_school	6	cpe:2.3:a:justsystems:just_school:6::::premium:::

References for CVE-2017-2154

URL	Tags
https://jvn.jp/en/jp/JVN54268888/index.html	Third Party Advisory VDB Entry
https://www.justsystems.com/jp/info/js17002.html	Vendor Advisory

URL

CVE-2017-2154

Exploit prediction scoring system (EPSS) score for CVE-2017-2154

Common vulnerability scoring system (CVSS) metrics for CVE-2017-2154

Weakness enumeration for CVE-2017-2154

Affected software / configurations for CVE-2017-2154

References for CVE-2017-2154