CVE-2023-45229Public exploit

Memory disclosure via DHCPv6 option-length underflow

Published Jan 16, 2024 · Updated Nov 4, 2025

Out-of-bounds read in TianoCore EDK II edk2-stable202308 allows remote attackers to disclose memory via a DHCPv6 Advertise message. Dhcp6SeekStsOption subtracts the 12-byte IA_NA or 4-byte IA_TA header from an unchecked 16-bit option length, so a short value wraps and drives scanning past the packet buffer. Exploitation requires IPv6 PXE boot to be enabled and the attacker to answer on the same broadcast domain; the documented impact is memory disclosure only.

CVSS severity6.5
Medium
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in TianoCore EDK II edk2-stable202308 allows remote attackers to disclose memory via a DHCPv6 Advertise message. Dhcp6SeekStsOption subtracts the 12-byte IA_NA or 4-byte IA_TA header from an unchecked 16-bit option length, so a short value wraps and drives scanning past the packet buffer. Exploitation requires IPv6 PXE boot to be enabled and the attacker to answer on the same broadcast domain; the documented impact is memory disclosure only.

The record

CVE
CVE-2023-45229
Published
Jan 16, 2024
Updated
Nov 4, 2025
Vendor
TianoCore
Product
EDK II
Classifications
CWE-125, T1557.003
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 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=edk2-stable202308

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

TianoCore · EDK IIversion=edk2-stable202308

Published CVSS scores

6.5TianoCore.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1557.003DHCP Spoofing

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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