CVE-2023-46977Public exploitNetwork attack vector

Unauthenticated router takeover via unchecked password decoding

Published Oct 31, 2023 · Updated Sep 6, 2024

Stack-based buffer overflow in TOTOLINK LR1200GB firmware 9.1.0u.6619_B20230130 allows remote attackers to crash or hijack the router. The loginAuth handler sends the password through urldecode, which writes the decoded value into a fixed-size stack buffer without checking its length. Unauthenticated access to the web management endpoint is sufficient; an oversized password can interrupt service or redirect program control.

CVSS severity9.8
Critical
EPSS probability8.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
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

Stack-based buffer overflow in TOTOLINK LR1200GB firmware 9.1.0u.6619_B20230130 allows remote attackers to crash or hijack the router. The loginAuth handler sends the password through urldecode, which writes the decoded value into a fixed-size stack buffer without checking its length. Unauthenticated access to the web management endpoint is sufficient; an oversized password can interrupt service or redirect program control.

The record

CVE
CVE-2023-46977
Published
Oct 31, 2023
Updated
Sep 6, 2024
Vendor
TOTOLINK
Product
TOTOLINK LR1200GB Firmware
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 31, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 6, 2024Record 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.1.0u.6619_b20230130

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TOTOLINK · TOTOLINK LR1200GB Firmwareversion=9.1.0u.6619_b20230130

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-787Out-of-bounds Write
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

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