CVE-2023-24051Public exploit

Admin access via client-side lockout enforcement

Published Dec 4, 2023 · Updated Aug 2, 2024

Authentication rate-limit bypass in Connectize AC21000 G6 firmware 641.139.1.1256 and earlier allows remote attackers to gain admin access. The web interface applies its three-failure, 180-second lockout only in client-side logic, so a page refresh or direct HTTP requests remove the restriction. Network reachability to the admin panel is required; unlimited password guesses grant complete panel control when the configured password is recovered.

CVSS severity9.8
Critical
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication rate-limit bypass in Connectize AC21000 G6 firmware 641.139.1.1256 and earlier allows remote attackers to gain admin access. The web interface applies its three-failure, 180-second lockout only in client-side logic, so a page refresh or direct HTTP requests remove the restriction. Network reachability to the admin panel is required; unlimited password guesses grant complete panel control when the configured password is recovered.

The record

CVE
CVE-2023-24051
Published
Dec 4, 2023
Updated
Aug 2, 2024
Vendor
Connectize
Product
AC21000 G6 Firmware
Classifications
CWE-863, CWE-307, T1110
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 4, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=0 <=641.139.1.1256

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Connectize · AC21000 G6 Firmwareversion=0 <=641.139.1.1256

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.3NCC GroupCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
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.

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
CWE-307Improper Restriction of Excessive Authentication Attempts
T1110Brute Force

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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