Security readout for executives and security teams
Plain-English summary
A remotely reachable flaw in the TRENDnet TEW-755AP can overflow device memory when a crafted SSID reaches the mycli component. A low-privileged attacker could potentially compromise confidentiality, integrity, and availability. Public proof-of-concept material increases urgency, but the supplied sources do not establish active exploitation.
Executive priority
Treat as an immediate asset-discovery and containment priority because impact is critical and proof-of-concept material is public. Determine whether affected access points exist, restrict management exposure, and obtain vendor remediation guidance. Escalate replacement planning if TRENDnet provides no supported fix.
Technical view
CVE-2026-76589 is a stack-based buffer overflow in FUN_401000 within /sbin/mycli, triggered through the ssid argument. It is scored CVSS 3.1 9.9: network-accessible, low complexity, low privileges, no user interaction, changed scope, and high impact across confidentiality, integrity, and availability.
Likely exposure
The bundle identifies TRENDnet TEW-755AP firmware up to 20260702, although its structured affected list names 20260702 specifically. Devices are higher risk where untrusted or low-privileged users can remotely reach the vulnerable functionality. Exact exposure pathways and vendor-confirmed version boundaries are not provided.
Exploitation context
Public proof-of-concept code is referenced, so technical details may be readily available to attackers. However, the bundle marks this CVE as absent from KEV and provides no evidence of observed exploitation in the wild. Public exploit availability must not be treated as confirmed active exploitation.
Researcher notes
The source bundle maps the issue to CWE-119 and CWE-121 and reports remote reachability with low privileges required. It does not document the vulnerable protocol, affected interface, patch status, vendor acknowledgment, or confirmed exploitation. The discrepancy between “up to 20260702” and the structured version entry warrants vendor verification.
Mitigation direction
- Identify all TEW-755AP devices and record their firmware versions.
- Check TRENDnet guidance for confirmed affected versions, updates, or mitigations.
- Restrict device management access to trusted administrators and networks.
- Isolate exposed devices until vendor remediation status is confirmed.
- Prioritize replacement if no supported security update becomes available.
Validation and detection
- Compare discovered firmware versions against TRENDnet's confirmed affected-version guidance.
- Verify untrusted networks cannot reach device management functionality.
- Review device and network logs for unusual administrative access or configuration changes.
- Confirm any vendor update is installed and persists after reboot.
- Retest access controls after mitigation without using public exploit code.
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-2026-76589 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
- 9.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.16VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R3.16VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P——VulDBAV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR810VulDBVulnerability scoring details
Base CVSS 4.0 score
9.4CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
Base CVSS 3.1 score
9.9CriticalVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 3.0 score
9.9CriticalVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/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-393085 | TRENDnet TEW-755AP mycli FUN_401000 stack-based overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-393085 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-76589 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #877845 | TRENDnet TEW-755AP TEW-755AP Stack-based Buffer OverflowCVE reference, VulDB · third-party-advisory
- https://github.com/meishigana/CVE/tree/main/team15_20260702/13_755ap-mycli-bofCVE reference, VulDB · related
- https://github.com/meishigana/CVE/blob/main/team15_20260702/13_755ap-mycli-bof/poc/poc-mycli-overflow.pyCVE 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.