Siemens SIMATIC S7-300 CPU devices allow remote attackers to cause a denial of service (defect-mode transition) via crafted packets on (1)…

published 2015-03-07 11 y ago modified 2026-06-17 4 mo ago also EUVD-2015-2285

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 34.3%; EPSS 34.3% chance of exploitation in 30 days, percentile 98%
public exploits: 1; Exploit-DB

Siemens SIMATIC S7-300 CPU devices allow remote attackers to cause a denial of service (defect-mode transition) via crafted packets on (1) TCP port 102 or (2) Profibus.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-15-064-04 updated 2025-06-06 cvss 7.8

Siemens SIMATIC S7-300 CPU Denial-of-Service Vulnerability

Siemens SIMATIC S7-300 CPU family
affected: mitigation “Siemens recommends the following mitigations:”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Timeline

2015-03-07 Published
2018-05-30 First public exploit (EDB-44802)

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 5 mo ago (2026-06-02)

Exploit prediction

34.34% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

EDB-44802 Siemens SIMATIC S7-300 CPU - Remote Denial of Service dos, 2018-05-30

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness

CWE-20 Improper Input Validation

References

exploit-db.com /exploits/44802/
exploit
siemens.com /innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-987029.pdf
vendor-advisory
ics-cert.us-cert.gov /advisories/ICSA-15-064-04
securitytracker.com /id/1032040
vdb-entry, third-party-advisory
securityfocus.com /bid/72973
vdb-entry
cert-portal.siemens.com /productcert/pdf/ssa-987029.pdf

Sources

CVE List CVE-2015-2177
NVD CVE-2015-2177

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary