CVE-2023-27389 [High] | Denial of Service in Cps-Mg341-Adsc1-111 Firmware

Inadequate encryption strength vulnerability in CONPROSYS IoT Gateway products allows a remote authenticated attacker with an administrative privilege to apply a specially crafted Firmware update file, alter the information, cause a denial-of-service (DoS) condition, and/or execute arbitrary code. The affected products and versions are as follows: M2M Gateway with the firmware Ver.3.7.10 and earlier (CPS-MG341-ADSC1-111, CPS-MG341-ADSC1-931, CPS-MG341G-ADSC1-111, CPS-MG341G-ADSC1-930, and CPS-MG341G5-ADSC1-931), M2M Controller Integrated Type with firmware Ver.3.7.6 and earlier versions (CPS-MC341-ADSC1-111, CPS-MC341-ADSC1-931, CPS-MC341-ADSC2-111, CPS-MC341G-ADSC1-110, CPS-MC341Q-ADSC1-111, CPS-MC341-DS1-111, CPS-MC341-DS11-111, CPS-MC341-DS2-911, and CPS-MC341-A1-111), and M2M Controller Configurable Type with firmware Ver.3.8.8 and earlier versions (CPS-MCS341-DS1-111, CPS-MCS341-DS1-131, CPS-MCS341G-DS1-130, CPS-MCS341G5-DS1-130, and CPS-MCS341Q-DS1-131).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.84%	0.52%	-0.32%
2	2026-04-20	1.33%	0.84%	-0.48%
3	2026-04-12	—	1.33%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.84%

0.52%

-0.32%

2026-04-20

1.33%

0.84%

-0.48%

2026-04-12

—

1.33%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.2	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:H/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:H) They need powerful rights—admin, root, or similar—before this pays off. 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.	1.2	5.9	[email protected]
7.2	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:H/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:H) They need powerful rights—admin, root, or similar—before this pays off. 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.	1.2	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.2

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/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:H): They need powerful rights—admin, root, or similar—before this pays off.
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.

1.2

5.9

[email protected]

7.2

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/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:H): They need powerful rights—admin, root, or similar—before this pays off.
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.

1.2

5.9

134c704f-9b21-4f2e-91b3-4a467353bcc0

Affected software / configurations for CVE-2023-27389

Vendor	Product	Version	Raw CPE
contec	cps-mg341-adsc1-111_firmware	<= 3.7.10	cpe:2.3:o:contec:cps-mg341-adsc1-111_firmware::::::::
contec	cps-mg341-adsc1-931_firmware	<= 3.7.10	cpe:2.3:o:contec:cps-mg341-adsc1-931_firmware::::::::
contec	cps-mg341g-adsc1-111_firmware	<= 3.7.10	cpe:2.3:o:contec:cps-mg341g-adsc1-111_firmware::::::::
contec	cps-mg341g-adsc1-930_firmware	<= 3.7.10	cpe:2.3:o:contec:cps-mg341g-adsc1-930_firmware::::::::
contec	cps-mg341g5-adsc1-931_firmware	<= 3.7.10	cpe:2.3:o:contec:cps-mg341g5-adsc1-931_firmware::::::::
contec	cps-mc341-adsc1-111_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-adsc1-111_firmware::::::::
contec	cps-mc341-adsc1-931_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-adsc1-931_firmware::::::::
contec	cps-mc341-adsc2-111_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-adsc2-111_firmware::::::::
contec	cps-mc341g-adsc1-110_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341g-adsc1-110_firmware::::::::
contec	cps-mc341q-adsc1-111_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341q-adsc1-111_firmware::::::::
contec	cps-mc341-ds1-111_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-ds1-111_firmware::::::::
contec	cps-mc341-ds11-111_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-ds11-111_firmware::::::::
contec	cps-mc341-ds2-911_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-ds2-911_firmware::::::::
contec	cps-mc341-a1-111_firmware	<= 3.7.6	cpe:2.3:o:contec:cps-mc341-a1-111_firmware::::::::
contec	cps-mcs341-ds1-111_firmware	<= 3.8.8	cpe:2.3:o:contec:cps-mcs341-ds1-111_firmware::::::::
contec	cps-mcs341-ds1-131_firmware	<= 3.8.8	cpe:2.3:o:contec:cps-mcs341-ds1-131_firmware::::::::
contec	cps-mcs341g-ds1-130_firmware	<= 3.8.8	cpe:2.3:o:contec:cps-mcs341g-ds1-130_firmware::::::::
contec	cps-mcs341g5-ds1-130_firmware	<= 3.8.8	cpe:2.3:o:contec:cps-mcs341g5-ds1-130_firmware::::::::
contec	cps-mcs341q-ds1-131_firmware	<= 3.8.8	cpe:2.3:o:contec:cps-mcs341q-ds1-131_firmware::::::::

References for CVE-2023-27389

URL	Tags
https://jvn.jp/en/vu/JVNVU96198617/	Third Party Advisory
https://www.contec.com/api/downloadlogger?download=/-/media/Contec/jp/support/security-info/contec_security_cps_230317_en.pdf	Mitigation Vendor Advisory
https://www.contec.com/download/donwload-list/?itemid=a054b3eb-da97-40d0-9598-d7f5ff4239ec#firmware	Product
https://www.contec.com/download/donwload-list/?itemid=a1b33f0d-d32b-4549-9741-613cd37d5528#firmware	Product
https://www.contec.com/download/donwload-list/?itemid=f832c526-dcf6-4976-85aa-f536c15a8120#firmware	Product

URL

CVE-2023-27389

Exploit prediction scoring system (EPSS) score for CVE-2023-27389

Common vulnerability scoring system (CVSS) metrics for CVE-2023-27389

Weakness enumeration for CVE-2023-27389

Affected software / configurations for CVE-2023-27389

References for CVE-2023-27389