CVE-2023-45231Public exploit

Firmware memory disclosure via truncated ND option

Published Jan 16, 2024 · Updated Nov 4, 2025

An out-of-bounds read in TianoCore EDK II before 202402 allows remote attackers to disclose firmware memory via IPv6 ND Redirect messages. Ip6IsNDOptionValid accepts a one-byte truncated option because its loop never runs, then Ip6ProcessRedirect reads the missing length byte past the packet. The target must be network-booting with IPv6 PXE enabled, and the unauthenticated attacker must share its local network.

CVSS severity6.5
Medium
EPSS probability0.86%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in TianoCore EDK II before 202402 allows remote attackers to disclose firmware memory via IPv6 ND Redirect messages. Ip6IsNDOptionValid accepts a one-byte truncated option because its loop never runs, then Ip6ProcessRedirect reads the missing length byte past the packet. The target must be network-booting with IPv6 PXE enabled, and the unauthenticated attacker must share its local network.

The record

CVE
CVE-2023-45231
Published
Jan 16, 2024
Updated
Nov 4, 2025
Vendor
TianoCore
Product
EDK II
Classifications
CWE-125, T1210
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?

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  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

6.5TianoCoreCVSS: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
T1210Exploitation of Remote Services

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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