Analyst readout for executives and security teams
Plain-English summary
This is a critical memory corruption flaw in Edimax EW-7438RPn firmware 1.31. A remote, authenticated attacker may be able to crash or fully compromise the device through the affected formStats function. Public proof-of-concept material exists, but the provided sources do not show confirmed active exploitation.
Executive priority
Prioritize rapid inventory and exposure reduction. The issue is critical because public exploit material exists and compromise could affect confidentiality, integrity, and availability of the device. Absence from KEV lowers certainty of active exploitation, not the need to act.
Technical view
CVE-2026-9481 is a stack-based buffer overflow in /goform/formStats caused by handling of the submit-url argument. VulDB reports remote attackability, public exploit availability, CVSS 2.0 score 9.0, and authentication required. The vendor reportedly did not respond, and no patch or fixed version is named in the provided sources.
Likely exposure
Exposure is limited to Edimax EW-7438RPn devices running firmware 1.31 where the affected function is reachable by network-authenticated users. Internet exposure, if present, would materially increase urgency, but the source bundle does not confirm default exposure conditions.
Exploitation context
The exploit has been published and may be used, according to the CVE description and references. KEV is false, and no cited source confirms active exploitation in the wild. Treat this as credible public exploit risk, not confirmed mass exploitation.
Researcher notes
The record is specific about product, version, path, parameter, weakness class, and CVSS vector. Evidence is incomplete on exploit reliability, affected deployment conditions, and remediation because the vendor reportedly did not respond and no fixed release is cited.
Mitigation direction
- Inventory Edimax EW-7438RPn devices and identify firmware version 1.31.
- Restrict access to affected device interfaces to trusted administrative networks only.
- Disable unnecessary remote access paths to these devices where operationally feasible.
- Monitor Edimax, CVE, and VulDB sources for vendor guidance or a fixed firmware release.
- Consider replacement or isolation if no vendor fix becomes available.
Validation and detection
- Confirm whether any EW-7438RPn devices run firmware version 1.31.
- Check whether /goform/formStats is reachable from untrusted or broad internal networks.
- Review device access controls for authenticated users and administrative reachability.
- Look for vendor advisories or firmware updates newer than the cited disclosure.
- Review logs for unusual authenticated requests to affected device paths.
Public sources used
Based on public source material and reviewed before publication.
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-2026-9481 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:UR 8 10 VulDB 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 2.8 5.9 VulDB 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 2.8 5.9 VulDB 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 — — VulDB Vulnerability scoring details
Base CVSS 4.0 score
8.7 HighVector: 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
8.8 HighVector: 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
8.8 HighVector: 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
9 CriticalVector: 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 timeline VulDB
Advisory disclosed
- Source timeline VulDB
VulDB entry created
- CVE reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- Source timeline VulDB
VulDB entry last update
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 source CVE List V5
- VDB-365462 | Edimax EW-7438RPn formStats stack-based overflow CVE reference, VulDB · vdb-entry, technical-description
- VDB-365462 | CTI Indicators (IOB, IOC, IOA) CVE reference, VulDB · signature, permissions-required
- Submit #813903 | Edimax EW-7438RPn 1.31 Stack-based Buffer Overflow CVE reference, VulDB · third-party-advisory
- https://github.com/wudipjq/my_vuln/blob/main/Edimax/vuln_19/19.md CVE reference, VulDB · exploit
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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.