CVE-2023-26801Known exploitationPublic exploitNetwork attack vector

Unauthenticated command execution via unchecked MAC field

Published Mar 26, 2023 · Updated May 5, 2025

Command injection in four LB-LINK router firmware releases allows remote attackers to execute arbitrary commands via a crafted HTTP request. The bs_SetLimitCli_info function in /lib/libshare-0.0.26.so concatenates the mac field into a formatted string passed to bl_do_system; time1 and time2 must both equal 00:00-00:00. No prior authentication is required on BL-AC1900_2.0 1.0.1, BL-WR9000 2.4.9, BL-X26 1.2.5, and BL-LTE300 1.0.8, enabling full device compromise.

CVSS severity9.8
Critical
EPSS probability69.66%
Next 30 days · Sep 16, 2026
Known exploitationReported
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

Command injection in four LB-LINK router firmware releases allows remote attackers to execute arbitrary commands via a crafted HTTP request. The bs_SetLimitCli_info function in /lib/libshare-0.0.26.so concatenates the mac field into a formatted string passed to bl_do_system; time1 and time2 must both equal 00:00-00:00. No prior authentication is required on BL-AC1900_2.0 1.0.1, BL-WR9000 2.4.9, BL-X26 1.2.5, and BL-LTE300 1.0.8, enabling full device compromise.

The record

CVE
CVE-2023-26801
Published
Mar 26, 2023
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-77, T1190, T1059.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Jun 13, 2023Exploitation reportedAkamai SIRT Mirai honeypot exploitation
  3. May 5, 2025Record 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

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.

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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application
T1059.004Unix Shell

Public exploit references

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

Reported exploitation

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