CVE-2023-6815 [Medium] | Security Vulnerability in R08sfcpu Firmware

Incorrect Privilege Assignment vulnerability in Mitsubishi Electric Corporation MELSEC iQ-R Series Safety CPU R08/16/32/120SFCPU all versions and MELSEC iQ-R Series SIL2 Process CPU R08/16/32/120PSFCPU all versions allows a remote authenticated attacker who has logged into the product as a non-administrator user to disclose the credentials (user ID and password) of a user with a lower access level than the attacker by sending a specially crafted packet.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.33%	0.70%	+0.37%
2	2025-11-21	0.14%	0.33%	+0.19%
3	2025-11-18	—	0.14%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.33%

0.70%

+0.37%

2025-11-21

0.14%

0.33%

+0.19%

2025-11-18

—

0.14%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N` 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: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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N` 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: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:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N 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: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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

6.5

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N 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: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:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

Affected software / configurations for CVE-2023-6815

Vendor	Product	Version	Raw CPE
mitsubishielectric	r08sfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r08sfcpu_firmware::::::::
mitsubishielectric	r16sfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r16sfcpu_firmware::::::::
mitsubishielectric	r32sfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r32sfcpu_firmware::::::::
mitsubishielectric	r120sfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r120sfcpu_firmware::::::::
mitsubishielectric	r08psfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r08psfcpu_firmware::::::::
mitsubishielectric	r16psfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r16psfcpu_firmware::::::::
mitsubishielectric	r32psfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r32psfcpu_firmware::::::::
mitsubishielectric	r120psfcpu_firmware	—	cpe:2.3:o:mitsubishielectric:r120psfcpu_firmware::::::::

References for CVE-2023-6815

URL	Tags
https://jvn.jp/vu/JVNVU95085830/index.html	Third Party Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-24-044-01	Third Party Advisory US Government Resource
https://www.mitsubishielectric.com/en/psirt/vulnerability/pdf/2023-021_en.pdf	Mitigation Vendor Advisory

URL

CVE-2023-6815

Exploit prediction scoring system (EPSS) score for CVE-2023-6815

Common vulnerability scoring system (CVSS) metrics for CVE-2023-6815

Weakness enumeration for CVE-2023-6815

Affected software / configurations for CVE-2023-6815

References for CVE-2023-6815