Security readout for executives and security teams
Plain-English summary
CVE-2026-3275 is a critical buffer overflow in Tenda F453 firmware 1.0.0.3. A remote authenticated attacker may be able to crash or take control of the router. Public exploit material is referenced, but the provided sources do not show confirmed active exploitation.
Executive priority
Treat this as urgent for any deployed Tenda F453 routers. The business priority is rapid asset discovery, removal of exposed management access, and vendor update tracking. If devices cannot be secured or patched, plan replacement.
Technical view
The flaw affects httpd handling of /goform/addressNat, specifically fromAddressNat processing of the entrys argument. Sources classify it as CWE-119/CWE-120 with CVSS v2 9.0, network attack vector, low complexity, and authenticated access required. No vendor patch is named in the provided sources.
Likely exposure
Exposure is limited to Tenda F453 devices running firmware 1.0.0.3. Risk is higher where the management interface is reachable from untrusted networks or administrator credentials are weak or shared.
Exploitation context
VulDB states the exploit has been made public and could be used for attacks. The CVE is not marked KEV in the provided bundle, and no cited source confirms active exploitation in the wild.
Researcher notes
Evidence is strongest for Tenda F453 firmware 1.0.0.3. The public references include a GitHub proof-of-concept link, but this assessment does not rely on exploit details. Authentication appears required, based on CVSS Au:S and VulDB permission indicators.
Mitigation direction
- Identify any Tenda F453 devices and firmware versions immediately.
- Restrict management access to trusted administrator networks only.
- Disable remote management if it is not operationally required.
- Use strong, unique administrator credentials.
- Check Tenda guidance for firmware updates or vendor-recommended mitigations.
- Replace unsupported or unpatchable devices if exposure cannot be controlled.
Validation and detection
- Inventory Tenda F453 devices and confirm firmware version.
- Verify whether management interfaces are Internet-facing or reachable from untrusted segments.
- Review administrator logs for unusual addressNat configuration activity.
- Confirm access controls restrict management to authorized administrators.
- Monitor vendor and CVE sources for patch or advisory updates.
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-2026-3275 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-347999 | Tenda F453 httpd addressNat fromAddressNat buffer overflowCVE reference · vdb-entry, technical-description
- VDB-347999 | CTI Indicators (IOB, IOC, IOA)CVE reference · signature, permissions-required
- Submit #759622 | 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_75/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.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
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.