Security readout for executives and security teams
Plain-English summary
CVE-2020-35139 is a denial-of-service issue reported in Faucet SDN Ryu 4.34. A remote attacker could trigger an infinite loop in message parsing, potentially making an SDN controller unavailable. Public data does not provide CVSS, CWE, patch status, or confirmed exploitation.
Executive priority
Prioritize if Ryu 4.34 supports production network control. The main business risk is controller availability, not data theft. Because public details are sparse, focus on confirming exposure and applying vendor or project guidance when available.
Technical view
The source describes an infinite loop in OFPBundleCtrlMsg handling in parser.py in Faucet SDN Ryu version 4.34. The reported impact is remote denial of service. The structured affected-product data is incomplete, so exposure should be validated against actual Ryu usage and the linked project issue.
Likely exposure
Most relevant to organizations running Faucet SDN Ryu 4.34, especially where OpenFlow or controller-facing message paths are reachable beyond tightly trusted infrastructure. The source bundle does not identify other affected versions or products.
Exploitation context
No KEV listing or cited source in the bundle confirms active exploitation. The public description only states remote attackers can cause DoS through an infinite loop. Exploit maturity, prerequisites, and attack complexity are not established in the provided evidence.
Researcher notes
Evidence is limited to the CVE description and one GitHub issue reference. The record lacks CVSS, CWE, affected CPEs, patch details, and exploit-status confirmation. Avoid assuming broader version impact without project confirmation.
Mitigation direction
- Check the linked Ryu issue for vendor or project remediation guidance.
- Inventory SDN controllers for Faucet SDN Ryu version 4.34.
- Limit controller and OpenFlow access to trusted network peers.
- Prioritize availability monitoring for affected SDN controller services.
- Plan upgrade or replacement if project guidance identifies a fixed version.
Validation and detection
- Confirm whether Ryu 4.34 is deployed in production or lab SDN environments.
- Review controller exposure to untrusted or semi-trusted network sources.
- Check logs and monitoring for controller hangs or repeated restarts.
- Track the referenced GitHub issue for fix status and affected-version clarification.
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.
CVE-2020-35139 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://github.com/faucetsdn/ryu/issues/118CVE reference
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.