CVE-2023-45234 Buffer Overflow in EDK II Network Package

High 8.3 Published 16 Jan 2024 Updated 4 Nov 2025

Attackers can exploit a buffer overflow in EDK II's DHCPv6 processing to gain unauthorized access and compromise system integrity.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2023-45234?

CVE-2023-45234 is a high-severity memory corruption vulnerability in TianoCore edk2, published on 16 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

EDK2's Network Package is susceptible to a buffer overflow vulnerability when processing DNS Servers option from a DHCPv6 Advertise message. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality, Integrity and/or Availability.

Weakness: CWE-119

Which versions are affected by CVE-2023-45234?

It affects 1 product.

Linux distribution packages (12)

`edk2` Red Hat:rhel_aus:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.4`
`edk2-ovmf` Red Hat:rhel_aus:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.4`
`edk2` Red Hat:rhel_aus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.5`
`edk2-ovmf` Red Hat:rhel_aus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.5`
`edk2` Red Hat:rhel_e4s:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.4`
`edk2-ovmf` Red Hat:rhel_e4s:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.4`
`edk2` Red Hat:rhel_e4s:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.5`
`edk2-ovmf` Red Hat:rhel_e4s:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.5`
`edk2` Red Hat:rhel_tus:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.4`
`edk2-ovmf` Red Hat:rhel_tus:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.4`
`edk2` Red Hat:rhel_tus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.5`
`edk2-ovmf` Red Hat:rhel_tus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.5`

Products include Tianocore Edk2.

How do I fix CVE-2023-45234?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-45234 being exploited?

There is no known exploitation of CVE-2023-45234 in the wild and no public exploit code.

Sources

Also known as AZL-38743, AZL-39118, AZL-39451, BELL-CVE-2023-45234, DEBIAN-CVE-2023-45234, GHSA-mrjv-p9q7-rxgr and 3 more.