Security readout for executives and security teams
Plain-English summary
CVE-2026-3377 is a critical buffer overflow in Tenda F453 firmware 1.0.0.3. A remote authenticated attacker could potentially take full control of the device. Public exploit material is referenced, but CISA KEV status is false in the provided sources, so active exploitation is not confirmed.
Executive priority
High priority for organizations using Tenda F453. Treat as urgent if management access is exposed beyond trusted administrators. If no patch is available, reduce exposure immediately and consider replacement planning.
Technical view
The flaw affects fromSafeUrlFilter in /goform/SafeUrlFilter. Manipulating the page argument can trigger a buffer overflow. VulDB rates it CVSS 2.0 9.0 with network access, low complexity, and authentication required. Affected product evidence is limited to Tenda F453 firmware 1.0.0.3.
Likely exposure
Exposure is most likely where Tenda F453 administration interfaces are reachable by untrusted users, especially over the internet or shared networks. Authentication is required per the provided CVSS vector, but weak or reused router credentials would increase practical risk.
Exploitation context
The source bundle says exploit material is public and may be used. No provided source confirms active exploitation in the wild, and KEV is false. The issue should still be treated urgently because compromise of edge network devices can affect traffic routing, access, and persistence.
Researcher notes
Evidence comes mainly from CVE/VulDB records and a public GitHub reference. The provided data names the vulnerable endpoint and parameter, but does not include vendor remediation or confirmed exploitation. Avoid assuming broader Tenda model impact without additional evidence.
Mitigation direction
- Identify any Tenda F453 devices and confirm firmware version.
- Restrict management access to trusted administrative networks only.
- Disable remote administration if not explicitly required.
- Change default or weak administrative credentials.
- Check Tenda guidance for firmware updates or official mitigation.
- Replace unsupported devices if no vendor fix is available.
Validation and detection
- Inventory network edge devices for Tenda F453 models.
- Verify whether firmware version 1.0.0.3 is present.
- Review firewall rules limiting access to device administration.
- Check logs for suspicious administrative access attempts.
- Monitor vendor and CVE sources for updated remediation guidance.
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-2026-3377 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.
SSVC decision data
CVSS vector scores
4 official scoresWe 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:UR810VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P——VulDBVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 3.0 score
8.8HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 2.0 score
9CriticalVector: AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineVulDB
Advisory disclosed
- Source timelineVulDB
VulDB entry created
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- Source timelineVulDB
VulDB entry last update
- 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
- VDB-348262 | Tenda F453 SafeUrlFilter fromSafeUrlFilter buffer overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-348262 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- Submit #759624 | Tenda F453 v1.0.0.3 Buffer Access Using Size of Source BufferCVE reference, VulDB · third-party-advisory
- https://github.com/Litengzheng/vul_db/blob/main/F453/vul_77/README.mdCVE reference, VulDB · exploit
- https://www.tenda.com.cn/CVE reference, VulDB · 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.