CVE-2015-2177: siemens simatic_s7-300_cpu_firmware Improper Input Validation
CVSS: 7.8v2.0HighModified
Published 07-03-2015Last modified 02-06-2026
Vulnerability summary
CVE-2015-2177 is a high (CVSS 7.8) Improper Input Validation vulnerability in siemens simatic_s7-300_cpu_firmware. EPSS estimates a 33.79% chance of exploitation in the next 30 days, higher than 98.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.8/10
010
High · v2.0 (NVD)EPSS score
33.79%
0%100%
High · -0.89 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1exploit-database
Timeline
- 07-03-2015PublishedVulnerability first disclosed.
- 02-06-2026Last modifiedVulnerability information updated.
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.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HSourcesAll 2 agree
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
High 7.8Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:N/I:N/A:CSourcesSingle source
EPSS trend
Probability
33.79%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
-0.89 pp
From 34.68% on 19-09-2026
19-09-202619-10-2026
EPSS score33.79%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundSiemens SIMATIC S7-300 CPU - Remote Denial of Service
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Siemens1 product
1 vendor · 1 product
References
6 links- ics-cert.us-cert.gov/advisories/ICSA-15-064-04X Refsource MISC
- www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-987029.pdfX Refsource CONFIRMVendor Advisory
- cert-portal.siemens.com/productcert/pdf/ssa-987029.pdfX Refsource CONFIRM