CVE-2024-1786Public exploitNetwork attack vector

Unauthenticated reboot via oversized login username

Published Feb 23, 2024 · Updated Aug 21, 2024

Buffer overflow in the D-Link DIR-600M C1 3.08 Telnet service allows remote attackers to reboot the router with an oversized username. The authentication handler accepts a crafted, overlong username without enforcing the destination buffer's size, causing the device to crash. No credentials are required, but Telnet is disabled by default; when enabled, the crash drops all ports and connectivity until an automatic reboot.

CVSS severity7.5
High
EPSS probability2.74%
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

Buffer overflow in the D-Link DIR-600M C1 3.08 Telnet service allows remote attackers to reboot the router with an oversized username. The authentication handler accepts a crafted, overlong username without enforcing the destination buffer's size, causing the device to crash. No credentials are required, but Telnet is disabled by default; when enabled, the crash drops all ports and connectivity until an automatic reboot.

The record

CVE
CVE-2024-1786
Published
Feb 23, 2024
Updated
Aug 21, 2024
Vendor
D-Link
Product
D-Link DIR-600M C1 Firmware
Classifications
CWE-120, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=3.08

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · D-Link DIR-600M C1 Firmwareversion=3.08
D-Link · DIR-600Mversion=3.08

Published CVSS scores

7.5VulDBCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.8VulDBAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499Endpoint Denial of Service

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