CVE-2018-3657 [Medium] | Memory Corruption in Simatic Field Pg M5 Firmware

Multiple buffer overflows in Intel AMT in Intel CSME firmware versions before version 12.0.5 may allow a privileged user to potentially execute arbitrary code with Intel AMT execution privilege via local access.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.26%	0.58%	+0.32%
2	2025-11-21	0.19%	0.26%	+0.07%
3	2025-11-18	—	0.19%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.26%

0.58%

+0.32%

2025-11-21

0.19%

0.26%

+0.07%

2025-11-18

—

0.19%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. 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.	0.8	5.9	[email protected]
7.2	2.0	HIGH	`AV:L/AC:L/Au:N/C:C/I:C/A:C` Click to expand Access vector (AV:L) Requires local access to the target system. Access complexity (AC:L) Exploitation conditions are straightforward and predictable. Authentication (AU:N) No authentication is required. Confidentiality impact (C:C) Complete confidentiality impact. Integrity impact (I:C) Complete integrity impact. Availability impact (A:C) Complete availability impact.	3.9	10.0	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
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.

0.8

5.9

[email protected]

7.2

2.0

HIGH

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

Access vector (AV:L): Requires local access to the target system.
Access complexity (AC:L): Exploitation conditions are straightforward and predictable.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:C): Complete confidentiality impact.
Integrity impact (I:C): Complete integrity impact.
Availability impact (A:C): Complete availability impact.

3.9

10.0

[email protected]

Affected software / configurations for CVE-2018-3657

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-2018-3657

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-2018-3657

Exploit prediction scoring system (EPSS) score for CVE-2018-3657

Common vulnerability scoring system (CVSS) metrics for CVE-2018-3657

Weakness enumeration for CVE-2018-3657

Affected software / configurations for CVE-2018-3657

References for CVE-2018-3657