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No exploitation reportedFix available

CVE-2018-16558

No exploitation reported by the sources we read.

  • Published2019-04-17
  • Fixed in2.5
  • WeaknessCWE-20

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

A vulnerability has been identified in SIMATIC S7-1500 CPU (All versions >= V2.0 and < V2.5), SIMATIC S7-1500 CPU (All versions <= V1.8.5). Specially crafted network packets sent to port 80/tcp or 443/tcp could allow an unauthenticated remote attacker to cause a Denial-of-Service condition of the device. The security vulnerability could be exploited by an attacker with network access to the affected systems on port 80/tcp or 443/tcp. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the device. At the time of advisory publication no public exploitation of this security vulnerability was known.

Timeline

dates in UTC
  1. 2019-04-1714:29CVE 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-2018-16558?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-16558?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Siemens simatic s7-1500 firmwareversion to verify
BranchAffectedFixed in
2.x≥ 2.0, < 2.52.5
1.8≤ 1.8.5no fix published

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-19-036-04 CISA2 known affected

    Siemens SIMATIC S7-1500 CPU

    Siemens SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants): All versions >= V2.0 and < V2.5 · Siemens SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants): All versions <= V1.8.5

Full record on NVD

Fix

  1. Update Siemens simatic s7-1500 firmware to 2.5
  2. Vendor fix CISA ICSA-19-036-04 · 1 productUpdate to V2.5 or newer https://support.industry.siemens.com/cs/de/en/view/109478459
  3. Vendor fix CISA ICSA-19-036-04 · 1 productUpdate to V2.5 or higher or when this is not possible (because of Hardware restrictions)
  4. Mitigation from the vendor CISA ICSA-19-036-04 · 2 productsProtect network access to port 80/tcp and port 443/tcp of affected devices.
  5. Mitigation from the vendor CISA ICSA-19-036-04 · 2 productsApply cell protection concept
  6. Mitigation from the vendor CISA ICSA-19-036-04 · 2 productsApply defense-in-depth

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVSS 3.07.5read 2026-10-23
  • NVDCVSS 2.07.8read 2026-10-23
  • NVDweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score2.0 %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
2019-04-17
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-16558?

A vulnerability has been identified in SIMATIC S7-1500 CPU (All versions >= V2.0 and < V2.5), SIMATIC S7-1500 CPU (All versions <= V1.8.5). Specially crafted network packets sent to port 80/tcp or 443/tcp could allow an unauthenticated remote attacker to cause a Denial-of-Service condition of the device. The security vulnerability could be exploited by an attacker with network access to the affected systems on port 80/tcp or 443/tcp. Successful exploitation requires no system privileges and no user interaction. An attacker could use the vulnerability to compromise availability of the device. At the time of advisory publication no public exploitation of this security vulnerability was known.

Is CVE-2018-16558 actively exploited?

Active exploitation of CVE-2018-16558 has not been confirmed. Its EPSS score was 2.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-16558?

CVE-2018-16558 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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