Security readout for executives and security teams
Plain-English summary
This flaw can let an external attacker reboot affected NETGEAR ProSAFE Plus switches by overwhelming the device TFTP server with concurrent connections. The business impact is availability: network interruptions, disrupted connected devices, and possible repeated outages if the service is reachable from untrusted networks.
Executive priority
Treat this as a network availability risk, not a data-theft issue based on current evidence. Prioritize remediation for switches supporting critical services or reachable from less trusted networks.
Technical view
CVE-2020-35233 affects NETGEAR JGS516PE and GS116Ev2 devices running firmware v2.6.0.43. The TFTP server does not handle multiple concurrent connections safely, allowing a denial-of-service condition that forces device reboots. The provided sources do not include CVSS, CWE, or detailed fixed-version data.
Likely exposure
Exposure is most likely where affected switch management or TFTP services are reachable from external, guest, or other untrusted networks. Internally isolated management networks reduce likely exposure. The source bundle names only JGS516PE and GS116Ev2 v2.6.0.43.
Exploitation context
The CVE description states external attackers can trigger reboots through concurrent TFTP connections. CISA KEV status is false in the provided bundle, and no cited source in the bundle confirms active exploitation in the wild.
Researcher notes
Evidence is limited to the CVE description and NCC Group advisory reference. The bundle does not provide CVSS scoring, CWE mapping, exploit-in-the-wild evidence, or explicit patch details. Avoid expanding scope beyond the two named models and firmware version.
Mitigation direction
- Inventory NETGEAR JGS516PE and GS116Ev2 switches and record firmware versions.
- Check NETGEAR guidance for fixed firmware or vendor-recommended remediation.
- Restrict TFTP and switch management access to trusted administration networks.
- Block untrusted network paths to the affected TFTP service.
- Monitor affected switches for unexpected reboots or availability events.
Validation and detection
- Confirm whether any JGS516PE or GS116Ev2 runs firmware v2.6.0.43.
- Verify TFTP and management interfaces are not reachable from untrusted networks.
- Review network logs for repeated connection bursts targeting switch TFTP services.
- Check device uptime and event logs for unexplained reboot patterns.
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-2020-35233 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://research.nccgroup.com/2021/03/08/technical-advisory-multiple-vulnerabilities-in-netgear-prosafe-plus-jgs516pe-gs116ev2-switches/CVE 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.