CVE-2018-3658 [Medium] | Information Disclosure in Simatic Field Pg M5 Firmware

CVE-2018-3658 is rated Moderate Risk (53.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 3.30%). EPSS rose +2.17% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	1.13%	3.30%	+2.17%
2	2025-11-21	1.96%	1.13%	-0.83%
3	2025-11-18	—	1.96%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

1.13%

3.30%

+2.17%

2025-11-21

1.96%

1.13%

-0.83%

2025-11-18

—

1.96%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.3	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L` 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:N) Doesn’t really leak secrets in a meaningful way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	3.9	1.4	[email protected]
5.0	2.0	MEDIUM	`AV:N/AC:L/Au:N/C:N/I:N/A:P` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:N) No integrity impact. Availability impact (A:P) Partial availability impact.	10.0	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.3

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 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:N): Doesn’t really leak secrets in a meaningful way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:L): Might cause slowdowns, glitches, or partial disruption—not a full brick.

3.9

1.4

[email protected]

5.0

2.0

MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:N): No integrity impact.
Availability impact (A:P): Partial availability impact.

10.0

2.9

[email protected]

Affected software / configurations for CVE-2018-3658

Vendor	Product	Version	Raw CPE
siemens	simatic_field_pg_m5_firmware	< 22.01.06	cpe:2.3:o:siemens:simatic_field_pg_m5_firmware::::::::
siemens	simatic_ipc427e_firmware	< 21.01.09	cpe:2.3:o:siemens:simatic_ipc427e_firmware::::::::
siemens	simatic_ipc477e_firmware	< 21.01.09	cpe:2.3:o:siemens:simatic_ipc477e_firmware::::::::
siemens	simatic_ipc547e_firmware	< r1.30.0	cpe:2.3:o:siemens:simatic_ipc547e_firmware::::::::
siemens	simatic_pc547g_firmware	< r1.23.0	cpe:2.3:o:siemens:simatic_pc547g_firmware::::::::
siemens	simatic_ipc627d_firmware	< 19.02.11	cpe:2.3:o:siemens:simatic_ipc627d_firmware::::::::
siemens	simatic_ipc647d_firmware	< 19.01.14	cpe:2.3:o:siemens:simatic_ipc647d_firmware::::::::
siemens	simatic_ipc677d_firmware	< 19.02.11	cpe:2.3:o:siemens:simatic_ipc677d_firmware::::::::
siemens	simatic_ipc827d_firmware	< 19.02.11	cpe:2.3:o:siemens:simatic_ipc827d_firmware::::::::
siemens	simatic_ipc847d_firmware	< 19.01.14	cpe:2.3:o:siemens:simatic_ipc847d_firmware::::::::
siemens	simatic_itp1000_firmware	< 23.01.04	cpe:2.3:o:siemens:simatic_itp1000_firmware::::::::
intel	converged_security_management_engine_firmware	>= 11.0.0, < 12.0.5	cpe:2.3:a:intel:converged_security_management_engine_firmware::::::::
intel	active_management_technology_firmware	< 12.0.5	cpe:2.3:o:intel:active_management_technology_firmware::::::::
intel	manageability_engine_firmware	>= 9.0.0.0, < 11.0	cpe:2.3:o:intel:manageability_engine_firmware::::::::

References for CVE-2018-3658

URL	Tags
http://www.securityfocus.com/bid/106996	Third Party Advisory VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-377318.pdf	Patch Third Party Advisory
https://ics-cert.us-cert.gov/advisories/ICSA-19-043-05	Third Party Advisory US Government Resource
https://security.netapp.com/advisory/ntap-20180924-0003/	Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03876en_us	Third Party Advisory
https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00141.html	Vendor Advisory

URL

CVE-2018-3658

Exploit prediction scoring system (EPSS) score for CVE-2018-3658

Common vulnerability scoring system (CVSS) metrics for CVE-2018-3658

Weakness enumeration for CVE-2018-3658

Affected software / configurations for CVE-2018-3658

References for CVE-2018-3658