CVE-2024-12344Public exploitNetwork attack vector

Router crash via oversized FTP username

Published Dec 8, 2024 · Updated Dec 9, 2024

Buffer overflow in the TP-Link VN020-F3v FTP USER handler in TT_V6.2.1021 allows remote attackers to crash the router. The handler fails to enforce a username-length limit, so an FTP USER command containing 1,450 bytes corrupts memory and immediately terminates router operation. The FTP service must be reachable; no login is required for the immediate-crash path, while longer payloads can corrupt authentication state.

CVSS severity5.3
Medium
EPSS probability1.87%
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 TP-Link VN020-F3v FTP USER handler in TT_V6.2.1021 allows remote attackers to crash the router. The handler fails to enforce a username-length limit, so an FTP USER command containing 1,450 bytes corrupts memory and immediately terminates router operation. The FTP service must be reachable; no login is required for the immediate-crash path, while longer payloads can corrupt authentication state.

The record

CVE
CVE-2024-12344
Published
Dec 8, 2024
Updated
Dec 9, 2024
Vendor
TP-Link
Product
VN020-F3v
Classifications
CWE-119, CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 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=TT_V6.2.1021

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TP-Link · VN020-F3vversion=TT_V6.2.1021

Published CVSS scores

6.3VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.3VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDB CNAAV:N/AC:L/Au:S/C:P/I:P/A:P

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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

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