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Description

A security flaw has been discovered in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setUpgradeFW of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument resetFlags results in os command injection. It is possible to initiate the attack remotely. The exploit has been released to the public and may be used for attacks.

PUBLISHED Reserved 2026-05-23 | Published 2026-05-24 | Updated 2026-05-24 | Assigner VulDB




CRITICAL: 9.3CVSS: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
CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
CRITICAL: 9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
10.0AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Problem types

OS Command Injection

Command Injection

Product status

7.1cu.643_b20200521
affected

Timeline

2026-05-23:Advisory disclosed
2026-05-23:VulDB entry created
2026-05-23:VulDB entry last update

Credits

LtzHuster (VulDB User) reporter

References

vuldb.com/vuln/365350 (VDB-365350 | Totolink A8000RU Web Management cstecgi.cgi setUpgradeFW os command injection) vdb-entry technical-description

vuldb.com/vuln/365350/cti (VDB-365350 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/813433 (Submit #813433 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection) third-party-advisory

github.com/...vuldb_new2/blob/main/A8000RU/vul_334/README.md exploit

www.totolink.net/ product

cve.org (CVE-2026-9387)

nvd.nist.gov (CVE-2026-9387)

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