CVE-2023-42770 [Critical] | Authentication Bypass in St-Ipm-6350 Firmware

Red Lion SixTRAK and VersaTRAK Series RTUs with authenticated users enabled (UDR-A) any Sixnet UDR message will meet an authentication challenge over UDP/IP. When the same message is received over TCP/IP the RTU will simply accept the message with no authentication challenge.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.16%	0.88%	+0.72%
2	2026-03-12	0.14%	0.16%	+0.01%
3	2025-11-21	—	0.14%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.16%

0.88%

+0.72%

2026-03-12

0.14%

0.16%

+0.01%

2025-11-21

—

0.14%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
10.0	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. 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	6.0	[email protected]
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]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

10.0

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
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

6.0

[email protected]

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]

Affected software / configurations for CVE-2023-42770

Vendor	Product	Version	Raw CPE
redlioncontrols	st-ipm-6350_firmware	4.9.114	cpe:2.3:o:redlioncontrols:st-ipm-6350_firmware:4.9.114:::::::*
redlioncontrols	st-ipm-8460_firmware	6.0.202	cpe:2.3:o:redlioncontrols:st-ipm-8460_firmware:6.0.202:::::::*
redlioncontrols	vt-mipm-135-d_firmware	4.9.114	cpe:2.3:o:redlioncontrols:vt-mipm-135-d_firmware:4.9.114:::::::*
redlioncontrols	vt-mipm-245-d_firmware	4.9.114	cpe:2.3:o:redlioncontrols:vt-mipm-245-d_firmware:4.9.114:::::::*
redlioncontrols	vt-ipm2m-213-d_firmware	4.9.114	cpe:2.3:o:redlioncontrols:vt-ipm2m-213-d_firmware:4.9.114:::::::*
redlioncontrols	vt-ipm2m-113-d_firmware	4.9.114	cpe:2.3:o:redlioncontrols:vt-ipm2m-113-d_firmware:4.9.114:::::::*

References for CVE-2023-42770

URL	Tags
https://https://support.redlion.net/hc/en-us/articles/19339209248269-RLCSIM-2023-05-Authentication-Bypass-and-Remote-Code-Execution	Mitigation Patch Vendor Advisory
https://www.cisa.gov/news-events/ics-advisories/icsa-23-320-01	Third Party Advisory US Government Resource

URL

CVE-2023-42770 | Red Lion Controls Sixnet RTU Authentication Bypass Using An Alternative Path Or Channel

Exploit prediction scoring system (EPSS) score for CVE-2023-42770

Common vulnerability scoring system (CVSS) metrics for CVE-2023-42770

Weakness enumeration for CVE-2023-42770

Affected software / configurations for CVE-2023-42770

References for CVE-2023-42770