CVE-2026-5176Public exploitNetwork attack vector

Unauthenticated command execution via rtLogServer injection

Published Mar 31, 2026 · Updated Mar 31, 2026

Command injection in TOTOLINK A3300R 17.0.0cu.557_b20221024 allows remote attackers to execute OS commands via a crafted request. The setSyslogCfg handler passes the unfiltered rtLogServer parameter through Uci_Set_Str and snprintf into CsteSystem, which invokes execv. No authentication or user interaction is required; injected commands execute in the router's embedded operating environment.

CVSS severity9.8
Critical
EPSS probability2.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in TOTOLINK A3300R 17.0.0cu.557_b20221024 allows remote attackers to execute OS commands via a crafted request. The setSyslogCfg handler passes the unfiltered rtLogServer parameter through Uci_Set_Str and snprintf into CsteSystem, which invokes execv. No authentication or user interaction is required; injected commands execute in the router's embedded operating environment.

The record

CVE
CVE-2026-5176
Published
Mar 31, 2026
Updated
Mar 31, 2026
Vendor
TOTOLINK
Product
A3300R
Classifications
CWE-74, CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=17.0.0cu.557_b20221024

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · A3300Rversion=17.0.0cu.557_b20221024

Published CVSS scores

5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.5VulDBAV:N/AC:L/Au:N/C:P/I:P/A:P

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
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

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Your stack

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