Security readout for executives and security teams
Plain-English summary
A crafted request to the Tenda G0 management interface can overflow memory in its web service. Successful abuse by a user with required access could compromise the device’s confidentiality, integrity, and availability. Public exploit material increases urgency, but the supplied evidence does not show active exploitation or identify a vendor fix.
Executive priority
Treat this as an urgent network-device exposure review. Immediately remove affected management interfaces from untrusted access paths, identify deployed firmware, and seek confirmed vendor remediation. Prioritize internet-accessible and broadly reachable devices first. Public exploit availability warrants speed, but current sources do not establish active exploitation.
Technical view
CVE-2026-19790 is a remotely reachable stack-based buffer overflow in Tenda G0 httpd. A crafted portMirrorMirroredPorts value processed by formSetPortMirror at /goform/module triggers the flaw. The CVSS v2 score is 9.0 with complete confidentiality, integrity, and availability impacts; its Au:S vector indicates authentication is required.
Likely exposure
Exposure is highest where affected Tenda G0 management interfaces are reachable from the internet or untrusted networks. Devices accessible only through restricted administrative networks have reduced exposure. The description says versions through 20260625 are affected, while structured data explicitly names 20260625; exact earlier-version coverage remains uncertain.
Exploitation context
Public proof-of-concept material is referenced, increasing the likelihood of attempted abuse. The supplied bundle marks KEV false and contains no evidence of observed in-the-wild exploitation. Authentication is indicated by the CVSS vector, although the precise privilege or session requirements are not documented.
Researcher notes
Evidence identifies formSetPortMirror, /goform/module, portMirrorMirroredPorts, and CWE-119/CWE-121. Version wording is inconsistent: the narrative says up to 20260625, while structured affected data lists 20260625. No vendor advisory, fixed release, attack telemetry, detailed authentication prerequisite, or root-cause analysis is supplied.
Mitigation direction
- Disable internet-facing remote management and restrict the Web interface to trusted administrative networks.
- Check Tenda guidance for corrected firmware; no fix is identified in the supplied sources.
- Limit administrative accounts and rotate credentials if unauthorized access is suspected.
- Monitor management access and configuration changes until corrective firmware is confirmed.
- Isolate or replace affected devices if vendor remediation remains unavailable.
Validation and detection
- Inventory Tenda G0 devices and record their installed firmware versions.
- Determine whether the Web Management Interface is reachable from internet, user, guest, or vendor networks.
- Verify remote administration is disabled or restricted to authorized management hosts.
- Review available logs for unexpected administrative sessions or port-mirroring configuration changes.
- Use isolated laboratory validation; do not run the public proof of concept against production devices.
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-2026-19790 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-389757 | Tenda G0 httpd Web Management module formSetPortMirror stack-based overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-389757 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-19790 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #868924 | Tenda G0 Tenda G0 Buffer OverflowCVE reference, VulDB · third-party-advisory
- https://github.com/lipenghai/iot_bug/blob/main/Tenda/G0/1.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.