CVE-2023-39541Public exploitNetwork attack vector

Device crash via uninitialized ICMPv6 buffer index

Published Feb 20, 2024 · Updated Nov 4, 2025

Buffer over-read in Gecko Platform 4.3.1.0 and uC-TCP-IP 3.06.01 allows remote attackers to crash devices via a crafted ICMPv6 packet. NetICMPv6_TxMsgErrValidate uses the uninitialized ICMP_MsgIx value 0xffff to index DataPtr when an erroneous IPv6 header reaches error handling before normal index initialization. The target must process the packet with debug argument checking disabled; dereferencing the resulting invalid pointer can terminate the network stack.

CVSS severity5.9
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer over-read in Gecko Platform 4.3.1.0 and uC-TCP-IP 3.06.01 allows remote attackers to crash devices via a crafted ICMPv6 packet. NetICMPv6_TxMsgErrValidate uses the uninitialized ICMP_MsgIx value 0xffff to index DataPtr when an erroneous IPv6 header reaches error handling before normal index initialization. The target must process the packet with debug argument checking disabled; dereferencing the resulting invalid pointer can terminate the network stack.

The record

CVE
CVE-2023-39541
Published
Feb 20, 2024
Updated
Nov 4, 2025
Vendor
Sigma Designs
Product
Gecko Platform
Classifications
CWE-125, CWE-126, 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

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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=4.3.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Sigma Designs · Gecko Platformversion=4.3.1.0
Weston Embedded Solutions · uC-TCP-IPversion=v3.06.01

Published CVSS scores

5.9Cisco TalosCVSS:3.1/AV:N/AC:H/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.

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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-125Out-of-bounds Read
CWE-126Buffer Over-read
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

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Your stack

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