CVE-2024-1783Public exploitNetwork attack vector

Authentication bypass via unchecked http_host stack copy

Published Feb 23, 2024 · Updated Aug 12, 2024

Stack overflow in TOTOLINK LR1200GB 9.1.0u.6619_B20230130 and 9.3.5u.6698_B20230810 allows remote attackers to bypass authentication. The loginAuth function in /cgi-bin/cstecgi.cgi copies a non-null http_host value onto the local stack without a bounds check, allowing it to overwrite the stored username and password. A crafted unauthenticated request can obtain an authenticated session; this CVE alone does not establish command execution.

CVSS severity9.8
Critical
EPSS probability2.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in TOTOLINK LR1200GB 9.1.0u.6619_B20230130 and 9.3.5u.6698_B20230810 allows remote attackers to bypass authentication. The loginAuth function in /cgi-bin/cstecgi.cgi copies a non-null http_host value onto the local stack without a bounds check, allowing it to overwrite the stored username and password. A crafted unauthenticated request can obtain an authenticated session; this CVE alone does not establish command execution.

The record

CVE
CVE-2024-1783
Published
Feb 23, 2024
Updated
Aug 12, 2024
Vendor
TOTOLINK
Product
TOTOLINK LR1200GB Firmware
Classifications
CWE-121, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 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=9.1.0u.6619_b20230130
  2. Affected versionversion=9.3.5u.6698_B20230810

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · TOTOLINK LR1200GB Firmwareversion=9.1.0u.6619_b20230130; version=9.3.5u.6698_B20230810
TOTOLINK · LR1200GBversion=9.1.0u.6619_B20230130; version=9.3.5u.6698_B20230810

Published CVSS scores

9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C

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-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

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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