Security readout for executives and security teams
Plain-English summary
Certain Tenda FH303/A300 routers running firmware V5.07.68_EN can allow an unauthenticated attacker to change DNS settings. That could redirect users to malicious sites or enable traffic interception. The issue is rated critical, but the provided sources do not show CISA KEV listing or confirmed active exploitation.
Executive priority
Treat as urgent for any affected routers in production or internet-exposed locations. DNS tampering can undermine user trust and redirect business traffic. Prioritize inventory, exposure reduction, and vendor guidance review.
Technical view
The flaw is an insufficient cookie/session validation issue affecting the /goform/AdvSetDns endpoint. Sources state crafted admin cookies can permit unauthenticated DNS configuration changes. The CVSS v3.1 score is 9.8, network-exploitable, low complexity, no privileges, and no user interaction.
Likely exposure
Exposure is limited to Tenda FH303/A300 devices on firmware V5.07.68_EN, especially where the router management interface is reachable from untrusted networks.
Exploitation context
Exploit-DB is listed as a public exploit reference, indicating public technical details exist. The source bundle does not confirm active exploitation, botnet use, or CISA KEV inclusion.
Researcher notes
The record cites CWE-290 and describes authentication bypass through insufficient cookie validation. Evidence supports public exploit availability, but not confirmed exploitation in the wild. No patch version is named in the provided sources.
Mitigation direction
- Identify any Tenda FH303/A300 routers running firmware V5.07.68_EN.
- Check Tenda or device support channels for fixed firmware or official guidance.
- Disable remote administration from the internet where possible.
- Restrict management access to trusted internal networks only.
- Replace affected devices if no vendor-supported fix is available.
- Review and restore DNS settings to trusted resolvers.
Validation and detection
- Inventory router models and firmware versions.
- Confirm whether management interfaces are exposed externally.
- Review current DNS settings for unauthorized resolvers.
- Check administrative logs for unexpected DNS configuration changes.
- Verify compensating controls restrict access to router administration.
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-290: 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-2018-25318 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.
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:H3.95.9Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-44381CVE reference · exploit
- VulnCheck Advisory: Tenda FH303/A300 V5.07.68_EN Cookie Session Weakness DNS ChangeCVE reference · third-party-advisory
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.
Authentication Bypass by Spoofing
Authentication Bypass by Spoofing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.