Analyst readout for executives and security teams
Plain-English summary
Totolink A8000RU routers running firmware 7.1cu.643_b20200521 have a critical web management flaw that can let a remote attacker run operating-system commands. The public record says exploit details are available. No source in the bundle confirms active exploitation or a vendor patch.
Executive priority
Prioritize immediately for any exposed A8000RU management interface. Remote command execution on network edge equipment can lead to full device compromise, traffic interception, pivoting, or outage. Absence from KEV lowers certainty of active exploitation, not business impact.
Technical view
The issue affects /cgi-bin/cstecgi.cgi in the Web Management Interface, specifically setStaticDhcpRules. Manipulating the enable argument can cause OS command injection. The CVSS v2 vector is 10.0 with network access, low complexity, and no authentication. CWE-77 and CWE-78 are cited.
Likely exposure
Exposure is most likely where affected A8000RU web management is reachable from untrusted networks, especially internet-facing administration. Internal-only devices still matter if attackers gain local network access. The bundle names only A8000RU firmware 7.1cu.643_b20200521.
Exploitation context
The source bundle states the exploit is public and may be used. KEV is false, and the provided sources do not confirm active exploitation in the wild. Treat public management exposure as urgent because the vulnerability enables remote command execution with no authentication per the CVSS vector.
Researcher notes
Evidence supports command injection in setStaticDhcpRules via the enable parameter. The bundle cites public exploit availability, CWE-77/CWE-78, and CVSS 10.0. It does not provide confirmed exploitation, patch status, or broader affected firmware versions; avoid extrapolating beyond the named build.
Mitigation direction
- Identify A8000RU devices and confirm firmware version 7.1cu.643_b20200521.
- Disable or restrict web management access from untrusted networks.
- Check Totolink guidance for patched firmware or supported replacement options.
- If no fix exists, isolate or retire affected devices.
- Monitor for suspicious web management access and command-execution indicators.
Validation and detection
- Inventory routers and verify model, firmware, and management interface exposure.
- Review firewall rules for internet or guest-network access to web management.
- Check VulDB CTI indicators without using them as exploit instructions.
- Confirm whether Totolink has published updated firmware or mitigation guidance.
- Record compensating controls for any device that cannot be patched.
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-2026-9408 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-365389 | Totolink A8000RU Web Management cstecgi.cgi setStaticDhcpRules os command injection CVE reference, VulDB · vdb-entry, technical-description
- VDB-365389 | CTI Indicators (IOB, IOC, TTP, IOA) CVE reference, VulDB · signature, permissions-required
- Submit #813443 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection CVE reference, VulDB · third-party-advisory
- https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_340/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 conservative ATT&CK lookup hints, not official CWE-to-ATT&CK mappings. Source links are consolidated once in the official source material section above.