Security readout for executives and security teams
Plain-English summary
CVE-2026-2930 affects Tenda A18 firmware 15.13.07.13. A remote user with required access can trigger a stack-based overflow in the device web service. Public proof-of-concept material is referenced, but the provided sources do not show confirmed active exploitation. Business risk is highest where these devices are internet-exposed or used in sensitive networks.
Executive priority
Prioritize review if Tenda A18 devices are deployed in business networks or reachable from the internet. The issue is not rated critical, but public exploit availability and network reachability make exposure reduction time-sensitive.
Technical view
The flaw is in webCgiGetUploadFile in /cgi-bin/UploadCfg within the Tenda A18 Httpd Service. Manipulating the boundary argument can cause a stack-based buffer overflow. CVSS v2 is 6.5 with AV:N/AC:L/Au:S and partial confidentiality, integrity, and availability impact. CWE mappings are CWE-119 and CWE-121.
Likely exposure
Exposure is limited to Tenda A18 devices running firmware 15.13.07.13, especially where the web administration service is reachable over a network. The CVSS vector indicates authentication is required. The sources do not provide CPEs or a vendor patch statement.
Exploitation context
The vulnerability is remotely reachable and public exploit material is referenced by VulDB and GitHub. However, CISA KEV is false in the provided bundle, and no cited source confirms active exploitation in the wild. Treat this as elevated risk if administrative interfaces are exposed.
Researcher notes
Evidence supports a stack-based overflow in a specific Tenda A18 firmware version. The public record indicates proof-of-concept availability but not active exploitation. Remediation details are incomplete in the supplied sources, so avoid assuming a fixed version until Tenda or another authoritative source confirms it.
Mitigation direction
- Identify Tenda A18 devices running firmware 15.13.07.13.
- Check Tenda guidance for fixed firmware or official mitigations.
- Restrict web administration access to trusted management networks only.
- Disable external access to the device management interface where possible.
- Use strong administrative credentials and remove unnecessary accounts.
- Monitor for unexpected access to the UploadCfg endpoint.
Validation and detection
- Inventory Tenda A18 devices and record firmware versions.
- Confirm whether web management is reachable from untrusted networks.
- Review logs for access to /cgi-bin/UploadCfg.
- Check VulDB and Tenda pages for updated remediation details.
- Verify any firmware update through official Tenda channels.
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-121: 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-2026-2930 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
- Medium
- CVSS
- 6.5 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:S/C:P/I:P/A:P/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:P/I:P/A:P/E:POC/RL:ND/RC:UR86.4Primary CVE scoreVulnerability scoring details
Base CVSS 2.0 score
6.5MediumVector: AV:N/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR
Source materials
- CVE List V5 sourceCVE List V5
- VDB-347277 | Tenda A18 Httpd Service UploadCfg webCgiGetUploadFile stack-based overflowCVE reference · vdb-entry, technical-description
- VDB-347277 | CTI Indicators (IOB, IOC, IOA)CVE reference · signature, permissions-required
- Submit #755227 | Tenda A18 V15.13.07.13 Stack-based Buffer OverflowCVE reference · third-party-advisory
- https://github.com/master-abc/cve/issues/40CVE reference · exploit, issue-tracking
- 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.