Security readout for executives and security teams
Plain-English summary
This affects Siemens SIMATIC NET CP 343-1 communication processors, including SIPLUS variants. Crafted traffic to TCP port 102 can knock affected devices into denial of service, and recovery may require a cold restart. In an industrial environment, that can interrupt PLC communications and operational availability.
Executive priority
Prioritize this for OT environments where production depends on affected Siemens communication modules. The main business risk is availability loss, not data theft, but recovery may require operational intervention and downtime.
Technical view
CVE-2020-25242 is a CWE-400 resource-consumption denial-of-service issue affecting all versions of CP 343-1 Advanced, Lean, and Standard, including SIPLUS variants. The trigger is specially crafted packets sent to TCP/102. The provided sources do not include CVSS scoring, exploit details, or a confirmed software fix.
Likely exposure
Exposure is most likely where affected Siemens S7-300 communication processors have TCP/102 reachable from engineering stations, HMIs, plant networks, remote access paths, or poorly segmented enterprise networks.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Public details confirm the attack condition and denial-of-service outcome, but no weaponized exploit status is provided.
Researcher notes
Evidence is limited to public advisory metadata in the bundle. Avoid assuming patch availability, exploit maturity, or affected products beyond the listed Siemens CP 343-1 families. Focus validation on asset presence and TCP/102 exposure.
Mitigation direction
- Check Siemens SSA-676775 and CISA ICSA-21-131-07 for vendor-approved guidance.
- Inventory CP 343-1 Advanced, Lean, Standard, and SIPLUS variants.
- Limit TCP/102 reachability to required trusted OT systems.
- Review remote access paths into affected automation networks.
- Prepare operational recovery procedures for cold restart scenarios.
Validation and detection
- Confirm whether affected CP 343-1 variants exist in asset inventory.
- Map which network zones can reach TCP/102 on those devices.
- Review firewall rules and remote access paths for unnecessary exposure.
- Check vendor advisories for product-specific remediation status.
- Document restart impact and recovery ownership with operations teams.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2020-25242 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-676775.pdfCVE reference · x_refsource_CONFIRM
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-07CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.