CVE-2015-2177Simatic S7-300 Cpu Vulnerability
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.
Published Mar 7, 2015 · Updated Jun 2, 2026
Key Facts
Patch immediately- CVE-2015-2177 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Simatic S7-300 Cpu (Siemens), Simatic S7-300 Cpu Firmware (Siemens).
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 34% probability of exploitation in the next 30 days.
- No fixed version is listed yet; check the vendor advisory for mitigations.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (30-day exploit likelihood)
34%
Higher than 98.3% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
38/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
1
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
Description
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.
Affected Products
2 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Simatic S7-300 CpuSiemens | See advisory | n/a |
| Simatic S7-300 Cpu FirmwareSiemens | See advisory | n/a |
Timeline
Publicly disclosed
Mar 7, 2015
Last updated
Jun 2, 2026
Weakness Type
- CWE-20 Improper Input Validation
References
- advisory1032040
- advisorysiemens.com · siemens_security_advisory_ssa-987029.pdf
- exploitExploitDB-44802
- othercert-portal.siemens.com · ssa-987029.pdf
- otherics-cert.us-cert.gov · ICSA-15-064-04
FAQ
Common Questions.
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.
Affected: Simatic S7-300 Cpu (Siemens); Simatic S7-300 Cpu Firmware (Siemens). The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Is CVE-2015-2177 On Your Attack Surface?
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