The authentication implementation in the web server on Siemens SCALANCE X-200 switches with firmware before 5.0.0 does not use a sufficient
The authentication implementation in the web server on Siemens SCALANCE X-200 switches with firmware before 5.0.0 does not use a sufficient source of entropy for generating values of random numbers, which makes it easier for remote attackers to hijack sessions by predicting a value.
- Published
- Sep 17, 2013
- Updated
- Jun 16, 2026
- EPSS
- 3.0% · 87th percentile
- CWE
- CWE-189
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Report tools
Action score
34
Monitor
Low priority for now.
- CVSS
- 33 / 40 · 8.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 3.0%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| siemens | scalance x-200 series firmware | cpe:2.3:o:siemens:scalance_x-200_series_firmware |
| siemens | scalance x-200 | cpe:2.3:h:siemens:scalance_x-200 |
| siemens | scalance x-200rna | cpe:2.3:h:siemens:scalance_x-200rna |
| siemens | scalance x200-4p irt | cpe:2.3:h:siemens:scalance_x200-4p_irt |
| siemens | scalance x201-3p irt | cpe:2.3:h:siemens:scalance_x201-3p_irt |
| siemens | scalance x202-2irt | cpe:2.3:h:siemens:scalance_x202-2irt |
| siemens | scalance x202-2p irt | cpe:2.3:h:siemens:scalance_x202-2p_irt |
| siemens | scalance x204irt | cpe:2.3:h:siemens:scalance_x204irt |
| siemens | scalance xf-200 | cpe:2.3:h:siemens:scalance_xf-200 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- siemens scalance x-200all versions
- siemens scalance x-200 series firmwareup to 4.4 inclusive
- siemens scalance x-200 series firmware4.3
- siemens scalance x-200rnaall versions
- siemens scalance x200-4p irtall versions
- siemens scalance x201-3p irtall versions
- siemens scalance x202-2irtall versions
- siemens scalance x202-2p irtall versions
- siemens scalance x204irtall versions
- siemens scalance xf-200all versions
Same product
siemens: all recordsOther highest-scoring records for the same primary product.
- CVE-2013-5944The integrated web server on Siemens SCALANCE X-200 switches with firmware before 4.5.0 and X-200IRT switches with firmware before 5.1.0 doe41Plan
- CVE-2015-1049The web server on Siemens SCALANCE X-200IRT switches with firmware before 5.2.0 allows remote attackers to hijack sessions via unspecified v28Monitor
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).
Technical details
Attack conditions
If successful
- Confidentiality
- P · data can be read
- Integrity
- P · data or configuration can be modified
- Availability
- C · the service can be disrupted
- Attack complexity
- M
- Confidentiality impact
- P
- Integrity impact
- P
- Availability impact
- C
Weakness class (CWE)
CWE-189 · Numeric ErrorsCVSS vector
AV:N/AC:M/Au:N/C:P/I:P/A:C
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; 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 helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- ics-cert.us-cert.gov/advisories/ICSA-13-254-01
- www.siemens.com/corporate-technology/pool/de/forschungsfelder/siemens_security_advisory_ssa-850708.pdf
- cert-portal.siemens.com/productcert/pdf/ssa-850708.pdf
Vendor advisories and official records. Exploit/PoC links are deliberately left out.