CVE-2026-9404

CRITICAL 9.3 PoC AVAILABLE

Published 2026-05-24 · Last modified 2026-05-29

A vulnerability was identified in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument provider leads to os command injection. The attack may be launched remotely. The exploit is publicly available and might be used.

EXPLOIT AVAILABLE

Public exploit or PoC code exists. Modeled probability is still low, but the barrier to attack is reduced — watch closely.

Exploitation likelihood

1.7%chance of exploitation in 30 days · 75th percentile

○ In CISA KEV ● Public exploit / PoC

Impact if exploited

9.3CVSS 4.0 · CRITICAL

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable
✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

PoC https://github.com/Litengzheng/vuldb_new2/blob/main/A8000RU/vul_336/README.md

Listed for defensive triage and patch prioritization.

Affected

Vendors Totolink

Products A8000ru

Weakness (CWE)

CWE-78: OS command injection
CWE-77: Command injection

CVSS vector

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

References

Sources: NVD · CVE.org · EPSS