Security readout for executives and security teams
Plain-English summary
CVE-2026-3274 is a reported critical buffer overflow in Tenda F453 firmware 1.0.0.3. It affects the router’s web service and can be reached remotely, but the CVSS data indicates authentication is required. Public proof-of-concept exploit material is referenced. No active exploitation is confirmed by KEV or the provided sources.
Executive priority
Treat as urgent for environments using Tenda F453 1.0.0.3 with reachable management interfaces. Prioritize inventory, exposure reduction, and vendor guidance checks. Risk is lower where no affected devices exist or management access is tightly restricted.
Technical view
The issue is in httpd’s frmL7ProtForm handler for /goform/L7Prot. Manipulating the page argument reportedly triggers a buffer overflow, mapped to CWE-119 and CWE-120. The CVSS v2 score is 9.0 with network access, low complexity, single authentication, and complete confidentiality, integrity, and availability impact.
Likely exposure
Exposure appears limited to Tenda F453 devices running firmware 1.0.0.3, especially where the management web interface is reachable by untrusted networks or users. Organizations should verify whether this model and firmware exist in branch, home-office, ISP-managed, lab, or legacy network environments.
Exploitation context
The source bundle states the attack can be carried out remotely and that exploit material has been publicly released. The CVSS vector lists authentication as required. There is no KEV listing and no cited source confirming active exploitation in the wild.
Researcher notes
Evidence points to a remotely reachable authenticated buffer overflow with public PoC availability. Provided sources do not name a vendor patch, workaround, or active exploitation. Avoid assuming impact beyond Tenda F453 firmware 1.0.0.3 unless additional vendor evidence appears.
Mitigation direction
- Inventory Tenda F453 devices and confirm firmware version 1.0.0.3.
- Check Tenda’s official site or support channels for firmware updates or advisories.
- Restrict router management access to trusted administrative networks only.
- Disable internet-facing management access where operationally possible.
- Rotate administrative credentials if exposure to untrusted users is suspected.
- Segment or replace affected devices if no vendor remediation is available.
Validation and detection
- Confirm device model and firmware from asset records or management interface.
- Identify whether httpd management endpoints are reachable from untrusted networks.
- Review access logs for suspicious requests to /goform/L7Prot.
- Use VulDB CTI indicators for defensive review where available.
- Validate any fix by confirming firmware version and reduced management exposure.
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-119: 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 lookupCWE-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-2026-3274 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 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
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 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.
AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810Primary CVE scoreVulnerability scoring details
Base CVSS 2.0 score
9CriticalVector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Source materials
- CVE List V5 sourceCVE List V5
- VDB-347998 | Tenda F453 httpd L7Prot frmL7ProtForm buffer overflowCVE reference · vdb-entry, technical-description
- VDB-347998 | CTI Indicators (IOB, IOC, IOA)CVE reference · signature, permissions-required
- Submit #759621 | Tenda F453 v1.0.0.3 Buffer Access Using Size of Source BufferCVE reference · third-party-advisory
- https://github.com/Litengzheng/vul_db/blob/main/F453/vul_74/README.mdCVE reference · exploit
- https://www.tenda.com.cn/CVE reference · product
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.