CVE-2026-31168Public exploitNetwork attack vector

Unauthenticated command execution via unsanitized recHour input

Published Apr 23, 2026 · Updated Apr 23, 2026

OS command injection in TOTOLINK A3300R firmware 17.0.0cu.557_B20221024 allows remote attackers to execute commands via recHour. The sub_414614 function reads recHour from a setScheduleCfg request, Uci_Set_Str places it into an sprintf-built command, and CsteSystem passes the command to execv without neutralizing shell syntax. No authentication or user interaction is required; injected commands run on the router, and the public proof of concept invokes wget through command substitution.

CVSS severity6.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

OS command injection in TOTOLINK A3300R firmware 17.0.0cu.557_B20221024 allows remote attackers to execute commands via recHour. The sub_414614 function reads recHour from a setScheduleCfg request, Uci_Set_Str places it into an sprintf-built command, and CsteSystem passes the command to execv without neutralizing shell syntax. No authentication or user interaction is required; injected commands run on the router, and the public proof of concept invokes wget through command substitution.

The record

CVE
CVE-2026-31168
Published
Apr 23, 2026
Updated
Apr 23, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo