Vulnerability · Published May 25, 2026 · Assigned by VulDB

CVE-2026-9457Totolink A8000RU Web Management cstecgi.cgi UploadFirmwareFile os command injection

Critical 9.8

In plain English

A critical-severity OS command injection in A8000RU from Totolink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 2.1% (higher than 82% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)2.1%top 18.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was determined in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function UploadFirmwareFile of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. This manipulation of the argument FileName causes os command injection. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized.

Affected products (as reported)

Vendor	Product	Versions
Totolink	A8000RU	7.1cu.643_b20200521

Weakness: CWE-78, CWE-77 · Vector: 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

References

VDB-365438 | Totolink A8000RU Web Management cstecgi.cgi UploadFirmwareFile os command injection vdb-entry, technical-description
VDB-365438 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #813454 | Totolink A8000RU 7.1cu.643_b20200521 Command Injection third-party-advisory
https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_343/README.md exploit
https://www.totolink.net/ product