CVE-2026-5679Public exploit

Authenticated command execution via unsanitized stun_pass value

Published Apr 6, 2026 · Updated Apr 6, 2026

OS command injection in TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to execute commands via stun_pass. The vsetTr069Cfg flow passes stun_pass through Uci_Set_Str into an sprintf-built command that CsteSystem submits to execv without neutralizing substitutions. Exploitation requires low-privilege access from an adjacent network and runs injected commands with the CGI service's privileges.

CVSS severity5.1
Medium
EPSS probability1.92%
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 TOTOLINK A3300R 17.0.0cu.557_B20221024 allows remote authenticated users to execute commands via stun_pass. The vsetTr069Cfg flow passes stun_pass through Uci_Set_Str into an sprintf-built command that CsteSystem submits to execv without neutralizing substitutions. Exploitation requires low-privilege access from an adjacent network and runs injected commands with the CGI service's privileges.

The record

CVE
CVE-2026-5679
Published
Apr 6, 2026
Updated
Apr 6, 2026
Vendor
TOTOLINK
Product
A3300R
Classifications
CWE-77, CWE-78, T1059
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 6, 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 vectoradjacent
Required privilegesauthenticated

What is affected?

TOTOLINK · A3300Rversion=17.0.0cu.557_B20221024

Published CVSS scores

2.0VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.5VulDBCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.1VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
5.2VulDBAV:A/AC:L/Au:S/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)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
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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