Security readout for executives and security teams
Plain-English summary
A remotely reachable, authenticated attacker could trigger a memory corruption flaw in a specific Tenda W20E firmware management function. Successful exploitation may compromise confidentiality, integrity, and availability. Public proof-of-concept material increases urgency, but the supplied sources do not establish active exploitation or confirm a vendor fix.
Executive priority
Treat as an urgent network-device exposure issue. Identify affected W20E units immediately and remove untrusted management access. Prioritize internet-reachable devices, shared administrative credentials, and unsupported deployments. Public proof-of-concept availability warrants rapid action, although active exploitation is not confirmed.
Technical view
CVE-2026-19824 is a stack-based buffer overflow in ipMacBindListStore, reached through /goform/addIpMacBind when processing IPMacBindRule. The supplied CVSS v2 vector is 9.0 and indicates network access, low complexity, and required authentication. Evidence names only firmware 15.11.0.6(1068_1546_841)_CN_TDC.
Likely exposure
Exposure is limited to Tenda W20E devices running the specifically identified firmware. Risk is highest where the management interface is reachable from untrusted networks or accessible through compromised credentials. The sources do not establish whether other firmware versions or Tenda products are affected.
Exploitation context
A public proof of concept is referenced, so attempted exploitation is plausible. However, CVE-2026-19824 is not identified as a CISA KEV entry in the supplied bundle, and no cited source confirms exploitation in the wild. The scoring vector indicates that authentication is required.
Researcher notes
The disclosure identifies CWE-119 and CWE-121 and attributes the overflow to IPMacBindRule processing. The available evidence does not establish execution reliability, affected-version breadth, vendor acknowledgement, or a fixed release. Avoid extrapolating impact to other W20E firmware without testing or authoritative vendor confirmation.
Mitigation direction
- Inventory Tenda W20E devices and identify the installed firmware version.
- Block management-interface access from the internet and other untrusted networks.
- Restrict administration to trusted management networks and authorized accounts.
- Review Tenda guidance for corrected firmware or vendor-approved mitigation.
- Replace or isolate affected devices if no supported correction is available.
Validation and detection
- Confirm device model and exact firmware version through trusted asset records or administration interfaces.
- Verify that management endpoints are inaccessible from internet-facing and untrusted network segments.
- Review authentication and network logs for unusual access to the affected management function.
- Confirm whether Tenda has published firmware or mitigation guidance for this CVE.
- After remediation, verify firmware versions and repeat management-interface exposure checks.
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-2026-19824 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:UR810VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDBCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R2.85.9VulDBCVSS: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——VulDBVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: 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
8.8HighVector: 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
8.8HighVector: 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
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-389957 | Tenda W20E addIpMacBind ipMacBindListStore stack-based overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-389957 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-19824 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #869024 | Tenda W20E US_W20EV4.0br_V15.11.0.6(1068_1546_841)_CN_TDC.bin Buffer OverflowCVE reference, VulDB · third-party-advisory
- https://github.com/paueger/mycve/blob/main/Tenda_W20E/5.mdCVE reference, VulDB · exploit
- https://www.tenda.com.cn/CVE reference, VulDB · 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.
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.