Analyst readout for executives and security teams
Plain-English summary
CVE-2026-9476 affects Totolink A8000RU routers. A password-setting function in the web management interface can allow remote command execution. The provided sources say public exploit material exists, but do not show confirmed active exploitation or a named vendor fix.
Executive priority
Treat exposed affected routers as urgent perimeter risk. Prioritize discovery and isolation immediately, then follow vendor guidance because the provided sources do not name a specific patch.
Technical view
The flaw is OS command injection in /cgi-bin/cstecgi.cgi, specifically setPasswordCfg handling of the admpass argument. The affected firmware identified is A8000RU 7.1cu.643_b20200521. VulDB rates it CVSS 10.0 under CVSS v2, with network access and no authentication indicated.
Likely exposure
Highest risk is internet-exposed Totolink A8000RU web management running firmware 7.1cu.643_b20200521. Internal-only devices still matter if untrusted users or compromised hosts can reach the management interface.
Exploitation context
The source bundle states the attack can be executed remotely and that exploit material is public. KEV is false, and no provided source confirms active exploitation in the wild.
Researcher notes
Evidence is centered on VulDB and a public GitHub reference. The record identifies CWE-77 and CWE-78, remote command injection, and affected firmware. Patch status, vendor advisory detail, and exploitation telemetry are not established in the provided bundle.
Mitigation direction
- Identify A8000RU devices and confirm firmware 7.1cu.643_b20200521.
- Remove web management exposure from the internet.
- Restrict administration access to trusted management networks only.
- Check Totolink guidance for fixed firmware or replacement advice.
- Rotate administrative credentials after containment if exposure is confirmed.
Validation and detection
- Inventory edge devices for Totolink A8000RU model and firmware.
- Review firewall and NAT rules for exposed web management interfaces.
- Check available logs for requests to /cgi-bin/cstecgi.cgi.
- Look for unexpected administrator password changes or configuration changes.
- Avoid active injection testing on production routers.
Public sources used
Based on public source material and reviewed before publication.
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-77: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-9476 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
- 10 (2.0)
- Known Exploited
- No
- Published
Vector: AV:N/AC:L/Au:N/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.
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:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR 10 10 VulDB CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R 3.9 5.9 VulDB CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R 3.9 5.9 VulDB CVSS:4.0/AV:N/AC:L/AT:N/PR:N/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
9.3 CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
Base CVSS 3.1 score
9.8 CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 3.0 score
9.8 CriticalVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
Base CVSS 2.0 score
10 CriticalVector: AV:N/AC:L/Au:N/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 timeline VulDB
Advisory disclosed
- Source timeline VulDB
VulDB entry created
- CVE reserved CVE Program
The CVE ID was reserved by the assigning CNA.
- Source timeline VulDB
VulDB entry last update
- CVE published CVE Program
The CVE record was published.
- CVE updated CVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 source CVE List V5
- VDB-365457 | Totolink A8000RU Web Management cstecgi.cgi setPasswordCfg os command injection CVE reference, VulDB · vdb-entry, technical-description
- VDB-365457 | CTI Indicators (IOB, IOC, TTP, IOA) CVE reference, VulDB · signature, permissions-required
- Submit #813459 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection CVE reference, VulDB · third-party-advisory
- https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_348/README.md CVE reference, VulDB · exploit
- https://www.totolink.net/ 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.
CWE mapping pending import
This CVE carries a CWE mapping that will resolve to a full Glexia CWE intelligence page after the official CWE import is complete.
Improper Neutralization of Special Elements used in an OS Command
Improper Neutralization of Special Elements used in an OS Command represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.