No exploitation reported

CVE-2016-7987

Q: Is CVE-2016-7987 actively exploited?

Active exploitation of CVE-2016-7987 has not been confirmed. Its EPSS score was 2.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2016-7987?

CVE-2016-7987 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2017-02-13
WeaknessCWE-19

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Siemens ETA4 firmware (all versions prior to Revision 08) of the SM-2558 extension module for: SICAM AK, SICAM TM 1703, SICAM BC 1703, and SICAM AK 3. Specially crafted packets sent to Port 2404/TCP could cause the affected device to go into defect mode. A cold start might be required to recover the system, a Denial-of-Service Vulnerability.

Timeline

dates in UTC

2017-02-1321:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2016-7987?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2016-7987?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Siemens eta2 firmwareversion to verify

Branch	Affected	Fixed in	Source
11.0	≤ 11.0	no fix published	NVD

Siemens eta4 firmwareversion to verify

Branch	Affected	Fixed in	Source
7.x	≤ 07	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-16-299-01 CISA7 known affected
Siemens SICAM RTU Devices Denial-of-Service Vulnerability
Siemens SICAM AK SM-2558 extension ETA4 firmware: <Revision_08 · Siemens SICAM TM 1703 SM-2558 extension ETA4 firmware: <Revision_08 · Siemens SICAM BC 1703 SM-2558 extension ETA4 firmware: <Revision_08 · +4 more

Full record on NVD

Fix

Mitigation from the vendor CISA ICSA-16-299-01 · 7 productsSiemens provides firmware ETA4 Revision 08 for SM-2558 that fixes the vulnerability and recommends customers update to the fixed version. (http://w3.siemens.com/smartgrid/global/en/products-systems-solutions/substation-automation/substation-automation/Pages/Overview.aspx)
Mitigation from the vendor CISA ICSA-16-299-01 · 7 productsFor the SM-2556 extension module, Siemens recommends customers contact the support center at: (mailto:support.energy@siemens.com)
Mitigation from the vendor CISA ICSA-16-299-01 · 7 productsUntil patches can be applied, Siemens advises to apply the following steps to mitigate the risk: Use a firewall or the IPsec functionality of the SM-2558 module to restrict access to Port 2404/TCP, The SICAM RTUs ADMINISTRATOR Security Manual: (http://www.downloads.siemens.com/download-center/d/SIC…
Mitigation from the vendor CISA ICSA-16-299-01 · 7 productsAs a general security measure Siemens strongly recommends to protect network access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). It is advised to configure the environment according to Siemens operational guidelines in order to run the devices in a protected IT environment. Sie…
Mitigation from the vendor CISA ICSA-16-299-01 · 7 productsFor more information on this vulnerability and more detailed mitigation instructions, please see Siemens Security Advisory SSA-296574 at the following location: (http://www.siemens.com/cert/advisories)

Advisories and patches

ics-cert.us-cert.govMitigation

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.07.8read 2026-10-23
NVDweakness (CWE)CWE-19read 2026-10-23
FIRST EPSSEPSS score2.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2017-02-13
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2016-7987?

Is CVE-2016-7987 actively exploited?

Active exploitation of CVE-2016-7987 has not been confirmed. Its EPSS score was 2.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2016-7987?

CVE-2016-7987 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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