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CVE Record

CVE-2026-9479: Edimax EW-7438RPn formLogout stack-based overflow

A security vulnerability has been detected in Edimax EW-7438RPn 1.31. The affected element is the function formLogout of the file /goform/formLogout. The manipulation of the argument submit-url leads to stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CriticalCVSS 9Not KEV-listed Updated
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Glexia's Take critical

Analyst readout for executives and security teams

Plain-English summary

CVE-2026-9479 is a critical buffer overflow reported in Edimax EW-7438RPn firmware 1.31. A remote authenticated attacker could potentially compromise the device through its logout handler. Public exploit material is referenced, but the provided sources do not show confirmed active exploitation or a vendor fix.

Executive priority

Treat this as urgent for any deployed EW-7438RPn 1.31 device. The main business risk is compromise of a network edge device with public exploit information and no confirmed vendor fix in the provided sources.

Technical view

The issue affects formLogout in /goform/formLogout. Manipulating the submit-url argument is reported to cause a stack-based buffer overflow, mapped to CWE-119 and CWE-121. The CVSS v2 vector is network-accessible, low complexity, authenticated, and rated 9.0 with proof-of-concept exploit maturity.

Likely exposure

Exposure is limited to Edimax EW-7438RPn devices running firmware 1.31, especially where the web management interface is reachable by authenticated users over a network.

Exploitation context

The source bundle says exploit material has been publicly disclosed and may be used. It does not show CISA KEV listing, confirmed in-the-wild exploitation, vendor acknowledgement, or a named patch.

Researcher notes

Evidence is strongest for product, version, vulnerable function, parameter, CWE class, and public disclosure. Evidence is incomplete for exploit reliability, active exploitation, affected firmware beyond 1.31, and remediation availability. Avoid broad product conclusions beyond EW-7438RPn 1.31.

Mitigation direction

  • Inventory Edimax EW-7438RPn devices and confirm firmware versions.
  • Restrict web management access to trusted administrative networks only.
  • Check Edimax guidance for firmware updates or official mitigations.
  • Disable external exposure of the management interface where possible.
  • Plan replacement if no supported fixed firmware is available.

Validation and detection

  • Confirm whether any EW-7438RPn devices run firmware 1.31.
  • Verify the management interface is not internet-accessible.
  • Review administrative access logs for unusual authenticated activity.
  • Track CVE, VulDB, and Edimax sources for patch status changes.
  • Document compensating controls for any device that cannot be updated.
Prepared
Confidence
medium
Sources
6

Public sources used

Based on public source material and reviewed before publication.

Potential ATT&CK relevance

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 · low confidence lookup

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.

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cwe · low confidence lookup

CWE-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 lookup
cve · low confidence lookup

CVE-2026-9479 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profile CVE Program record
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

Official CVE source material

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.

4 CVSS vectors
6 Timeline events
1 ADP providers
5 Source links

SSVC decision data

CISA-ADP CISA Coordinator
Timestamp
Version
2.0.3
Exploitation: pocAutomatable: noTechnical Impact: total

CVSS vector scores

4 official scores

We 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.

Score Version Severity Vector Exploit Impact Source
9 CVSS 2.0 Critical AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR 8 10 VulDB
8.8 CVSS 3.1 High 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
8.8 CVSS 3.0 High 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
8.7 CVSS 4.0 High 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 High
CVSS 4.0 vector shape for CVE-2026-9479 Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: 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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timeline VulDB

    Advisory disclosed

  2. Source timeline VulDB

    VulDB entry created

  3. CVE reserved CVE Program

    The CVE ID was reserved by the assigning CNA.

  4. Source timeline VulDB

    VulDB entry last update

  5. CVE published CVE Program

    The CVE record was published.

  6. CVE updated CVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADP CISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

Vendor Product Version / package Status
Edimax EW-7438RPn 1.31 Listed
Weakness

CWE details

CWE-119CWE-121

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-119 · source CWE mapping

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.

Open CWE intelligence Same-CWE CVEs
CWE-121 · source CWE mapping

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.

Open CWE intelligence Same-CWE CVEs