CVE-2023-45235 Buffer Overflow in EDK II Network Package

High 8.3 Published 16 Jan 2024 Updated 4 Nov 2025

An attacker can exploit a buffer overflow in EDK II's DHCPv6 handling 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-2023-45235?

CVE-2023-45235 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

handling Server ID option

from a DHCPv6 proxy 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-2023-45235?

It affects 1 product.

Linux distribution packages (21)

`edk2` Red Hat:rhel_aus:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.5`
`edk2-ovmf` Red Hat:rhel_aus:8.2::appstream	All versions	`0:20190829git37eef91017ad-9.el8_2.5`
`edk2` Red Hat:rhel_aus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.6`
`edk2-ovmf` Red Hat:rhel_aus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.6`
`edk2` Red Hat:rhel_aus:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`
`edk2-ovmf` Red Hat:rhel_aus:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`
`edk2` Red Hat:rhel_e4s:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.6`
`edk2-ovmf` Red Hat:rhel_e4s:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.6`
`edk2` Red Hat:rhel_e4s:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`
`edk2-aarch64` Red Hat:rhel_e4s:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`
`edk2-ovmf` Red Hat:rhel_e4s:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`
`edk2` Red Hat:rhel_e4s:9.0::appstream	All versions	`0:20220126gitbb1bba3d77-3.el9_0.5`
`edk2-aarch64` Red Hat:rhel_e4s:9.0::appstream	All versions	`0:20220126gitbb1bba3d77-3.el9_0.5`
`edk2-ovmf` Red Hat:rhel_e4s:9.0::appstream	All versions	`0:20220126gitbb1bba3d77-3.el9_0.5`
`edk2` Red Hat:rhel_eus:8.8::appstream	All versions	`0:20220126gitbb1bba3d77-4.el8_8.5`
`edk2-aarch64` Red Hat:rhel_eus:8.8::appstream	All versions	`0:20220126gitbb1bba3d77-4.el8_8.5`
`edk2-ovmf` Red Hat:rhel_eus:8.8::appstream	All versions	`0:20220126gitbb1bba3d77-4.el8_8.5`
`edk2` Red Hat:rhel_tus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.6`
`edk2-ovmf` Red Hat:rhel_tus:8.4::appstream	All versions	`0:20200602gitca407c7246bf-4.el8_4.6`
`edk2` Red Hat:rhel_tus:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`
`edk2-ovmf` Red Hat:rhel_tus:8.6::appstream	All versions	`0:20220126gitbb1bba3d77-2.el8_6.6`

Products include Tianocore Edk2.

How do I fix CVE-2023-45235?

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-2023-45235 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-45235 exists.

Sources

Also known as AZL-39064, AZL-39319, AZL-39490, BELL-CVE-2023-45235, DEBIAN-CVE-2023-45235, GHSA-h9v6-q439-p7j2 and 6 more.