Specially crafted packets sent to port 161/udp could cause a denial of service condition.
Specially crafted packets sent to port 161/udp could cause a denial of service condition. The affected devices must be restarted manually.
- Published
- Dec 26, 2017
- Updated
- Jun 16, 2026
- EPSS
- 3.3% · 88th percentile
- CWE
- CWE-400
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Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 34 / 40 · 8.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.3%
CNA vs NVD score
- NVD
- —
- CNA · siemens
- 7.5
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| siemens | simatic s7-200 firmware | cpe:2.3:o:siemens:simatic_s7-200_firmware |
| siemens | simatic s7-200 | cpe:2.3:h:siemens:simatic_s7-200 |
| siemens | simatic s7-400pn v6 firmware | cpe:2.3:o:siemens:simatic_s7-400pn_v6_firmware |
| siemens | simatic s7-400pn v6 | cpe:2.3:h:siemens:simatic_s7-400pn_v6 |
| siemens | simatic s7-400h v6 firmware | cpe:2.3:o:siemens:simatic_s7-400h_v6_firmware |
| siemens | simatic s7-400h v6 | cpe:2.3:h:siemens:simatic_s7-400h_v6 |
| siemens | simatic s7-400pn\/dp v7 firmware | cpe:2.3:o:siemens:simatic_s7-400pn\/dp_v7_firmware |
| siemens | simatic s7-400pn\/dp v7 | cpe:2.3:h:siemens:simatic_s7-400pn\/dp_v7 |
| siemens | simatic s7-410 v8 firmware | cpe:2.3:o:siemens:simatic_s7-410_v8_firmware |
| siemens | simatic s7-410 v8 | cpe:2.3:h:siemens:simatic_s7-410_v8 |
| siemens | simatic s7-300 firmware | cpe:2.3:o:siemens:simatic_s7-300_firmware |
| siemens | simatic s7-300 | cpe:2.3:h:siemens:simatic_s7-300 |
and 64 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- siemens dk standard ethernet controller firmwareall versions
- siemens ek-ertec 200p firmwarebefore 4.5
- siemens ek-ertec 200pn io firmwareall versions
- siemens simatic compact field unit firmwareall versions
- siemens simatic et 200al firmwareall versions
- siemens simatic et 200ecopn firmwareall versions
- siemens simatic et 200m firmwareall versions
- siemens simatic et 200mp firmwareall versions
- siemens simatic et 200pro firmwareall versions
- siemens simatic et 200s firmwareall versions
- siemens simatic et 200sp firmwareall versions
- siemens simatic pn/pn coupler firmwareall versions
- siemens simatic s7-1200 firmwareall versions
- siemens simatic s7-1500 controller firmware2.0
- siemens simatic s7-1500 firmwarebefore 2.0
- siemens simatic s7-200 firmwarebefore 2.03.01
- siemens simatic s7-300 firmwareall versions
- siemens simatic s7-400h v6 firmwarebefore 6.0.8
- siemens simatic s7-400pn v6 firmwarebefore 6.0.6
- siemens simatic s7-400pn/dp v7 firmwareall versions
Versions reported by the vendor
Affected version ranges reported by the assigning authority (siemens). Independent of NVD's CPE analysis and usually ahead of it.
Siemens Development/Evaluation Kits for PROFINET IO: DK Standard Ethernet Controller
- All versions < V4.1.1 Patch 05affected
Siemens Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200
- All versions < V4.5affected
Siemens Development/Evaluation Kits for PROFINET IO: EK-ERTEC 200P
- All versions < V4.5affected
Siemens SIMATIC Compact Field Unit
- All versionsaffected
Siemens SIMATIC ET 200AL IM 157-1 PN
- before V1.0.2affected
Siemens SIMATIC ET 200M (incl. SIPLUS variants)
- All versionsaffected
Siemens SIMATIC ET 200MP IM 155-5 PN BA
- before V4.0.2affected
Siemens SIMATIC ET 200MP IM 155-5 PN HF
- before V4.2.0affected
Siemens SIMATIC ET 200MP IM 155-5 PN ST
- before V4.1.0affected
Siemens SIMATIC ET 200pro IM 154-3 PN HF
- all versionsaffected
Siemens SIMATIC ET 200pro IM 154-4 PN HF
- all versionsaffected
Siemens SIMATIC ET 200SP IM 155-6 PN BA
- all versionsaffected
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-19-191 · Oct 8, 2019(Siemens Endüstriyel Ürünler Zafiyeti)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-400 · Uncontrolled Resource ConsumptionCVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Root cause
Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.
The bug in code
The whole CWE-400 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
function expand(node) { return node.children.map(expand);}Fixed
const MAX_DEPTH = 32;function expand(node, depth = 0) { if (depth > MAX_DEPTH) throw new Error("too deep"); return node.children.map((c) => expand(c, depth + 1));}Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- cert-portal.siemens.com/productcert/html/ssa-141614.html
- cert-portal.siemens.com/productcert/html/ssa-346262.html
- cert-portal.siemens.com/productcert/html/ssa-546832.html
- cert-portal.siemens.com/productcert/pdf/ssa-141614.pdf
- cert-portal.siemens.com/productcert/pdf/ssa-346262.pdf
- cert-portal.siemens.com/productcert/pdf/ssa-546832.pdf
- www.securityfocus.com/bid/101964
Vendor advisories and official records. Exploit/PoC links are deliberately left out.