CVE-2023-38562Public exploitNetwork attack vector

Unauthenticated code execution via IP loopback double-free

Published Feb 20, 2024 · Updated Nov 4, 2025

Double-free in IP loopback parsing in Weston Embedded Solutions uC-TCP-IP 3.06.01 allows remote attackers to execute code. When an invalid IPv4 option makes NetICMPv4_TxMsgErr route an error to a disabled loopback interface, two discard paths free the same buffer. Matching source and destination addresses are required; later buffer reuse and an ARP reply produce a null write, demonstrated as a crash and code execution when address zero holds function pointers.

CVSS severity8.7
High
EPSS probability1.08%
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

Double-free in IP loopback parsing in Weston Embedded Solutions uC-TCP-IP 3.06.01 allows remote attackers to execute code. When an invalid IPv4 option makes NetICMPv4_TxMsgErr route an error to a disabled loopback interface, two discard paths free the same buffer. Matching source and destination addresses are required; later buffer reuse and an ARP reply produce a null write, demonstrated as a crash and code execution when address zero holds function pointers.

The record

CVE
CVE-2023-38562
Published
Feb 20, 2024
Updated
Nov 4, 2025
Vendor
Weston Embedded Solutions
Product
uC-TCP-IP
Classifications
CWE-415, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 20, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=3.06.01
  2. Affected versionversion=v3.06.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Weston Embedded Solutions · uC-TCP-IPversion=3.06.01; version=v3.06.01

Published CVSS scores

8.7Cisco TalosCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:H
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/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 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-415Double Free
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