CVE-2023-31151 [Medium] | Security Vulnerability in Sel-2241 Rtac Module Firmware

An Improper Certificate Validation vulnerability in the Schweitzer Engineering Laboratories Real-Time Automation Controller (SEL RTAC) Web Interface could allow a remote unauthenticated attacker to conduct a man-in-the-middle (MitM) attack. See SEL Service Bulletin dated 2022-11-15 for more details.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-02-02	0.12%	0.15%	+0.03%
2	2025-07-23	0.18%	0.12%	-0.05%
3	2025-04-15	—	0.18%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-02-02

0.12%

0.15%

+0.03%

2025-07-23

0.18%

0.12%

-0.05%

2025-04-15

—

0.18%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.7	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	1.6	2.7	[email protected]
4.2	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	1.6	2.5	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.7

3.1

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

1.6

2.7

[email protected]

4.2

3.1

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

1.6

2.5

[email protected]

Affected software / configurations for CVE-2023-31151

Vendor	Product	Version	Raw CPE
selinc	sel-2241_rtac_module_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-2241_rtac_module_firmware::::::::
selinc	sel-3350_firmware	>= r148-v0, < r150-v2	cpe:2.3:o:selinc:sel-3350_firmware::::::::
selinc	sel-3505_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3505_firmware::::::::
selinc	sel-3505-3_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3505-3_firmware::::::::
selinc	sel-3530_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3530_firmware::::::::
selinc	sel-3530-4_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3530-4_firmware::::::::
selinc	sel-3532_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3532_firmware::::::::
selinc	sel-3555_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3555_firmware::::::::
selinc	sel-3560e_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3560e_firmware::::::::
selinc	sel-3560s_firmware	>= r147-v0, < r150-v2	cpe:2.3:o:selinc:sel-3560s_firmware::::::::

References for CVE-2023-31151

URL	Tags
https://selinc.com/support/security-notifications/external-reports/	Vendor Advisory
https://www.nozominetworks.com/blog/	Third Party Advisory

URL

CVE-2023-31151 | Improper Certificate Validation

Exploit prediction scoring system (EPSS) score for CVE-2023-31151

Common vulnerability scoring system (CVSS) metrics for CVE-2023-31151

Weakness enumeration for CVE-2023-31151

Affected software / configurations for CVE-2023-31151

References for CVE-2023-31151