CVE-2026-9435

CRITICAL 9.3 PoC AVAILABLE

Published 2026-05-25 · Last modified 2026-05-26

A vulnerability was detected in Totolink A8000RU 7.1cu.643_b20200521. The affected element is the function setQosCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Performing a manipulation of the argument enable results in os command injection. Remote exploitation of the attack is possible. The exploit is now public and may 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

1.9%chance of exploitation in 30 days · 77th 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_356/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