Security readout for executives and security teams
Plain-English summary
A reported flaw in Tenda AC10 v3 firmware V03.03.16.09 could let an unauthenticated network attacker crash the device permanently or possibly run code through a configuration upload endpoint. For executives, treat internet-exposed or unmanaged routers as urgent because compromise could disrupt connectivity and create a foothold.
Executive priority
Prioritize discovery and exposure reduction now. If affected devices support critical connectivity or remote sites, plan maintenance for vendor-confirmed firmware updates or replacement once guidance is available.
Technical view
CVE-2026-51380 is described as a CWE-120 buffer overflow in /cgi-bin/UploadCfg on Tenda AC10 v3 firmware V03.03.16.09. The CVSS 3.1 score is 9.8: network reachable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely where Tenda AC10 v3 devices running firmware V03.03.16.09 are reachable from untrusted networks, especially management interfaces exposed to the internet. The source bundle does not provide CPEs or a full affected-version range.
Exploitation context
The CVE record references public GitHub materials, but the provided bundle does not establish active exploitation. CISA KEV status is false. The vulnerability is still high concern because it is unauthenticated, network reachable, and affects a router management endpoint.
Researcher notes
Evidence is incomplete on vendor-confirmed affected ranges, patch status, and exploit maturity. The description supports unauthenticated remote attack potential, but public exploitation should not be claimed from the supplied sources alone.
Mitigation direction
- Identify Tenda AC10 v3 devices and confirm firmware versions.
- Check Tenda guidance and firmware availability before applying changes.
- Remove management access from the internet and untrusted networks.
- Restrict access to trusted administrative hosts or a management VLAN.
- Monitor affected devices for crashes, reboots, and configuration changes.
Validation and detection
- Inventory routers by model and firmware version.
- Confirm whether /cgi-bin/UploadCfg is reachable from untrusted networks.
- Review firewall, NAT, and remote-management exposure for affected devices.
- Check vendor and CVE records for updates on fixes or affected versions.
- Review logs for unexpected configuration upload activity or instability.
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-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-51380 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.tendacn.com/material/show/104968CVE reference, mitre
- https://github.com/snyi001/CV/blob/main/11.zipCVE reference, mitre
- https://github.com/snyi001/Tenda-AC10-v3CVE reference, mitre
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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.