CVE-2023-26978Public exploitNetwork attack vector

Remote command execution via unescaped PPPoE name

Published Apr 7, 2023 · Updated Feb 12, 2025

Command injection in TOTOlink A7100RU firmware 7.4cu.2313_B20191024 allows remote attackers to execute root commands. The WAN-setting handler passes pppoeAcName through Uci_Set_Str_By_Idx and Uci_Set_Str into a buffer that cstesystem and execv execute without filtering shell metacharacters. The public request uses a session cookie, while the published CVSS assessment marks privileges as none; successful exploitation runs commands with root privileges.

CVSS severity9.8
Critical
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

Command injection in TOTOlink A7100RU firmware 7.4cu.2313_B20191024 allows remote attackers to execute root commands. The WAN-setting handler passes pppoeAcName through Uci_Set_Str_By_Idx and Uci_Set_Str into a buffer that cstesystem and execv execute without filtering shell metacharacters. The public request uses a session cookie, while the published CVSS assessment marks privileges as none; successful exploitation runs commands with root privileges.

The record

CVE
CVE-2023-26978
Published
Apr 7, 2023
Updated
Feb 12, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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
9.8NIST NVDCVSS: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.

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

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Your stack

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