CVE-2023-45235: Buffer Overflow in EDK II Network Package
Noroxi assessment
Priority: Monitor (action score 35/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.2% (FIRST EPSS); higher than 68.7% of all records.
- Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: edk2-aarch64 (AlmaLinux:8) 20220126gitbb1bba3d77-13.el8_10; edk2-ovmf (AlmaLinux:8) 20220126gitbb1bba3d77-13.el8_10; edk2-aarch64 (AlmaLinux:9) 20231122-6.el9.
Low priority for now. Upgrade to edk2-aarch64 (AlmaLinux:8) 20220126gitbb1bba3d77-13.el8_10; edk2-ovmf (AlmaLinux:8) 20220126gitbb1bba3d77-13.el8_10; edk2-aarch64 (AlmaLinux:9) 20231122-6.el9 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- BDU:2024-00657
- ALSA-2024:2264
- ALSA-2024:3017
- DLA-4207-1
- openSUSE-SU-2024:14199-1
- RHSA-2024:2264
- RHSA-2024:3017
- RHSA-2024:4419
- RHSA-2024:6845
- RHSA-2024:6849
- RHSA-2024:6931
- RHSA-2024:8449
- RHSA-2024:8455
- RLSA-2024:2264
- RLSA-2024:3017
- SUSE-SU-2025:0407-1
- SUSE-SU-2025:0421-1
- SUSE-SU-2025:0503-1
- SUSE-SU-2025:0752-1
- SUSE-SU-2026:0196-1
- Published
- Jan 16, 2024
- Updated
- Jun 17, 2026
- EPSS
- 1.2% · 68th percentile
- CWE
- CWE-119
Report tools
Action score
35
Monitor
Low priority for now.
- CVSS
- 35 / 40 · 8.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 1.2%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- yes
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 8.8
- CNA · TianoCore
- 8.3
- 0.5 point gap
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| tianocore | edk2 | cpe:2.3:a:tianocore:edk2 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- tianocore edk2up to 202311 inclusive
Versions reported by the vendor
Affected version ranges reported by the assigning authority (TianoCore). Independent of NVD's CPE analysis and usually ahead of it.
TianoCore edk2
- edk2-stable202308affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | edk2-aarch64 | before 20220126gitbb1bba3d77-13.el8_10 | 20220126gitbb1bba3d77-13.el8_10 |
| AlmaLinux:8 | edk2-ovmf | before 20220126gitbb1bba3d77-13.el8_10 | 20220126gitbb1bba3d77-13.el8_10 |
| AlmaLinux:9 | edk2-aarch64 | before 20231122-6.el9 | 20231122-6.el9 |
| AlmaLinux:9 | edk2-ovmf | before 20231122-6.el9 | 20231122-6.el9 |
| AlmaLinux:9 | edk2-tools | before 20231122-6.el9 | 20231122-6.el9 |
| AlmaLinux:9 | edk2-tools-doc | before 20231122-6.el9 | 20231122-6.el9 |
| Debian:11 | edk2 | before 2020.11-2+deb11u3 | 2020.11-2+deb11u3 |
| Debian:12 | edk2 | before 2022.11-6+deb12u1 | 2022.11-6+deb12u1 |
| Debian:13 | edk2 | before 2023.11-6 | 2023.11-6 |
| openSUSE:Leap 15.6 | ovmf | before 202308-150600.5.9.1 | 202308-150600.5.9.1 |
| openSUSE:Tumbleweed | ovmf | before 202402-1.1 | 202402-1.1 |
| Red Hat:enterprise_linux:8::appstream | edk2 | before 0:20220126gitbb1bba3d77-13.el8_10 | 0:20220126gitbb1bba3d77-13.el8_10 |
| Red Hat:enterprise_linux:8::appstream | edk2-aarch64 | before 0:20220126gitbb1bba3d77-13.el8_10 | 0:20220126gitbb1bba3d77-13.el8_10 |
| Red Hat:enterprise_linux:8::appstream | edk2-ovmf | before 0:20220126gitbb1bba3d77-13.el8_10 | 0:20220126gitbb1bba3d77-13.el8_10 |
| Red Hat:enterprise_linux:9::appstream | edk2 | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:enterprise_linux:9::appstream | edk2-aarch64 | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:enterprise_linux:9::appstream | edk2-ovmf | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:enterprise_linux:9::crb | edk2-debugsource | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:enterprise_linux:9::crb | edk2-tools | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:enterprise_linux:9::crb | edk2-tools-debuginfo | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:enterprise_linux:9::crb | edk2-tools-doc | before 0:20231122-6.el9 | 0:20231122-6.el9 |
| Red Hat:rhel_aus:8.2::appstream | edk2 | before 0:20190829git37eef91017ad-9.el8_2.5 | 0:20190829git37eef91017ad-9.el8_2.5 |
| Red Hat:rhel_aus:8.2::appstream | edk2-ovmf | before 0:20190829git37eef91017ad-9.el8_2.5 | 0:20190829git37eef91017ad-9.el8_2.5 |
| Red Hat:rhel_aus:8.4::appstream | edk2 | before 0:20200602gitca407c7246bf-4.el8_4.6 | 0:20200602gitca407c7246bf-4.el8_4.6 |
+24
Same product
tianocore: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-38578Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.39Monitor
- CVE-2026-97631Pre-boot RCE in EDK II PXE driver38Monitor
- CVE-2023-45234Buffer Overflow in EDK II Network Package35Monitor
Published before and after this one in the same product
- ← EarlierCVE-2023-45232Jan 16, 2024 · Infinite loop in EDK II Network Package31Monitor
- ← EarlierCVE-2023-45233Jan 16, 2024 · Infinite loop in EDK II Network Package31Monitor
- Later →CVE-2023-45236Jan 16, 2024 · Predictable TCP ISNs in EDK II Network Package30Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:edk2-aarch64 | 20231122-6.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:edk2-ovmf | 20231122-6.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:edk2-tools | 20231122-6.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:edk2-tools-doc | 20231122-6.el9 · AlmaLinux:9 | Package registry (OSV) |
| debian:edk2 | 2022.11-6+deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:ovmf | 202308-150600.5.9.1 · openSUSE:Leap 15.6 | Package registry (OSV) |
| red hat:edk2 | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:edk2-aarch64 | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:edk2-debugsource | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::crb | Package registry (OSV) |
| red hat:edk2-ovmf | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:edk2-tools | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::crb | Package registry (OSV) |
| red hat:edk2-tools-debuginfo | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::crb | Package registry (OSV) |
| red hat:edk2-tools-doc | 0:20231122-6.el9 · Red Hat:enterprise_linux:9::crb | Package registry (OSV) |
| rocky linux:edk2 | 0:20231122-6.el9 · Rocky Linux:9 | Package registry (OSV) |
| suse:ovmf | 202208-150500.6.6.1 · SUSE:Linux Enterprise Micro 5.5 | Package registry (OSV) |
| suse:ovmf | 202308-150600.5.9.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP6 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Quarkslab Vulnerability Reports Teamfinder
- Doug Flickremediation developer
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2023-452300 days apartBuffer Overflow in EDK II Network Package35Monitor
- CVE-2023-452340 days apartBuffer Overflow in EDK II Network Package35Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone on the same network segment can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-119 · Improper Restriction of Operations within the Bounds of a Memory BufferCVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Overflow BuffersCAPEC-100likelihood: High · Very High
- Buffer ManipulationCAPEC-123likelihood: High · Very High
- Client-side Injection-induced Buffer OverflowCAPEC-14likelihood: Medium · High
- Filter Failure through Buffer OverflowCAPEC-24likelihood: High · High
- MIME ConversionCAPEC-42likelihood: High · High
- Overflow Binary Resource FileCAPEC-44likelihood: High · Very High
- Buffer Overflow via Symbolic LinksCAPEC-45likelihood: High · High
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- www.openwall.com/lists/oss-security/2024/01/16/2
- github.com/tianocore/edk2/security/advisories/GHSA-hc6x-cw6p-gj7h
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SJ42V7O7F4OU6R7QSQQECLB6LDHKZIMQ/
- security.netapp.com/advisory/ntap-20240307-0011/
- lists.debian.org/debian-lts-announce/2025/06/msg00007.html
- www.kb.cert.org/vuls/id/132380
Vendor advisories and official records. Exploit/PoC links are deliberately left out.