Security readout for executives and security teams
Plain-English summary
A flaw in one Tenda AC1206 firmware version allows a remote user with management access to trigger a memory overflow through the device-name function. The supplied CVSS assessment indicates possible complete compromise of confidentiality, integrity, and availability, but the public evidence does not confirm successful real-world attacks.
Executive priority
Treat confirmed affected devices as an urgent remediation priority, especially when management is remotely reachable. Reduce exposure immediately and obtain current vendor guidance. Replacement should be considered if no supported correction is available, but the supplied sources do not name a patch.
Technical view
CVE-2026-19788 is a stack-based buffer overflow in set_device_name, reached through /goform/SetOnlineDevName in the httpd management interface. Supplying an unsafe devName value can corrupt stack memory. The CVSS 2.0 vector scores 9.0 and indicates network access, low complexity, and single authentication.
Likely exposure
Confirmed scope is Tenda AC1206 firmware 15.03.06.23_multi_TD01. Risk is highest where the web management interface is reachable from untrusted networks or accessible with compromised credentials. The bundle does not establish whether other firmware versions or models are affected.
Exploitation context
A public proof of concept is referenced, so attempted exploitation is plausible. However, the CVE is not listed as KEV in the supplied bundle, and no cited evidence establishes active exploitation in the wild. Authentication appears required according to the CVSS vector.
Researcher notes
The evidence identifies the vulnerable endpoint, function, parameter, and stack-overflow class. It does not establish the precise overwrite conditions, reliable code execution, affected-version range beyond the named build, or observed attacks. One submission title references AC12 while the CVE scope names AC1206; validate device identity carefully.
Mitigation direction
- Identify AC1206 devices running firmware 15.03.06.23_multi_TD01.
- Restrict web management access to trusted administrative networks and users.
- Disable internet-facing management access where operationally possible.
- Check Tenda guidance for patched firmware or supported replacement options.
- Rotate management credentials if unauthorized access is suspected.
Validation and detection
- Inventory Tenda AC1206 devices and record their exact firmware versions.
- Confirm management interfaces are unreachable from untrusted networks.
- Review authentication and web-management logs for unusual device-name changes or repeated requests.
- Verify any vendor-recommended firmware update is installed successfully.
- Reassess exposure after configuration or firmware changes without reproducing the overflow.
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-2026-19788 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-389755 | Tenda AC1206 httpd web management interface SetOnlineDevName set_device_name stack-based overflowCVE reference, VulDB · vdb-entry, technical-description
- VDB-389755 | CTI Indicators (IOB, IOC, IOA)CVE reference, VulDB · signature, permissions-required
- CVE-2026-19788 | CVE Analysis and ReportCVE reference, VulDB · third-party-advisory
- Submit #868913 | Tenda AC12 US_AC1206V1.0RTL_V15.03.06.23_multi_TD01.bin Buffer OverflowCVE reference, VulDB · third-party-advisory
- https://github.com/lipenghai/iot_bug/blob/main/Tenda/AC12/1.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.