CVE-2025-28034Public exploitNetwork attack vector

Pre-auth command execution via unneutralized hostTime input

Published Apr 22, 2025 · Updated Apr 23, 2025

OS command injection in six TOTOLINK router firmware builds allows remote attackers to execute commands through the hostTime parameter. NTPSyncWithHost incorporates hostTime into an operating-system command without neutralizing shell control characters before execution. The affected builds are A800R 4.1.2cu.5137_B20200730, A810R 4.1.2cu.5182_B20201026, A830R 4.1.2cu.5182_B20201102, A950RG 4.1.2cu.5161_B20200903, A3000RU 5.9c.5185_B20201128, and A3100R 4.1.2cu.5247_B20211129; no authentication or user interaction is required.

CVSS severity9.8
Critical
EPSS probability1.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in six TOTOLINK router firmware builds allows remote attackers to execute commands through the hostTime parameter. NTPSyncWithHost incorporates hostTime into an operating-system command without neutralizing shell control characters before execution. The affected builds are A800R 4.1.2cu.5137_B20200730, A810R 4.1.2cu.5182_B20201026, A830R 4.1.2cu.5182_B20201102, A950RG 4.1.2cu.5161_B20200903, A3000RU 5.9c.5185_B20201128, and A3100R 4.1.2cu.5247_B20211129; no authentication or user interaction is required.

The record

CVE
CVE-2025-28034
Published
Apr 22, 2025
Updated
Apr 23, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-78, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

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

Technologies

Your stack

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Your stack

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