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Full vulnerability report · 2024
CVE-2023-45236High confidence

Predictable TCP ISNs in EDK II Network Package

TianoCore · edk2

Official source article: GitHub GHSA-HC6X-CW6P-GJ7H ↗. Check the applicable product and release in the original source.

5.8MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.99% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs TianoCore edk2 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: As exposure requiresRemediation target: Within 365 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

5 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourceedk2Vendor fix publishedDebian records a fixed source-package version for this release.2024.05-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourceedk2Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourceedk2Vendor fix publishedDebian records a fixed source-package version for this release.2024.05-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceedk2Vendor fix publishedDebian records a fixed source-package version for this release.2024.05-1Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveedk2Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

2 current
CVE-2023-45236 · CSAF 2.0 · revision 46 · interimSUSE Product Security TeamCVE-2023-45236
177 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • ovmf as component of SUSE CaaS Platform 4.0
  • ovmf-tools as component of SUSE CaaS Platform 4.0
  • qemu-ovmf-x86_64 as component of SUSE CaaS Platform 4.0
  • ovmf as component of SUSE Enterprise Storage 7.1
  • ovmf-tools as component of SUSE Enterprise Storage 7.1
  • qemu-ovmf-x86_64 as component of SUSE Enterprise Storage 7.1
  • qemu-uefi-aarch64 as component of SUSE Enterprise Storage 7.1
  • ovmf as component of SUSE Linux Enterprise High Performance Computing 12 SP2
  • ovmf-tools as component of SUSE Linux Enterprise High Performance Computing 12 SP2
  • qemu-ovmf-x86_64 as component of SUSE Linux Enterprise High Performance Computing 12 SP2
  • ovmf as component of SUSE Linux Enterprise High Performance Computing 12 SP4
  • ovmf-tools as component of SUSE Linux Enterprise High Performance Computing 12 SP4
Summary
EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
SA24P003 · CSAF 2.0 · revision 2 · finalABB Product Security Incident Response Team (PSIRT)CVE-2023-45236
10 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • B&R Industrial Automation GmbH APC4100 <1.09
  • B&R Industrial Automation GmbH APC910 <=1.25
  • B&R Industrial Automation GmbH C80 <1.14
  • B&R Industrial Automation GmbH MPC3100 <1.24
  • B&R Industrial Automation GmbH PPC1200 <1.14
  • B&R Industrial Automation GmbH PPC900 <2.16
  • B&R Industrial Automation GmbH APC2200 <1.35
  • B&R Industrial Automation GmbH PPC2200 <1.35
  • B&R Industrial Automation GmbH APC3100 <1.45
  • B&R Industrial Automation GmbH PPC3100 <1.45
Summary
EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.
Remediation
The problems are corrected in the following product versions: - APC4100 1.09 - APC910 No patch will be released (Please refer to the mitigation measures specified in this advisory). - C80 1.14 - MPC3100 1.24 - PPC1200 1.14 - PPC900 2.16 - APC2200 1.35 - PPC2200 1.35 - APC3100 1.45 - PPC3100 1.45 B&R recommends that customers apply the update at earliest convenience. The process to install updates is described in the user manual. The step to identify the installed product version is described in the user manual.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2023-49542

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 1 structured product or package state remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.

What

EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.

Why

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality.

Why

The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Exposure of Sensitive Information to an Unauthorized Actor → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-200 ↗

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-200
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

BSI · German · WID-SEC-2024-0126EDK2 NetworkPkg IP stack implementation: Mehrere Schwachstellen

Ein Angreifer aus dem angrenzenden Netzwerk oder ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in der EDK2 NetworkPkg IP stack implementation ausnutzen, um beliebigen Programmcode auszuführen, vertrauliche Informationen offenzulegen und einen Denial of Service Zustand auszulösen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20240117Security Bulletin 17 Jan 2024

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 17 Jan 2024, published on 17 January 2024. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0679Multiples vulnérabilités dans les produits Intel

d?id=CVE-2023-43489 Référence CVE CVE-2023-43747 https://www.cve.org/CVERecord?id=CVE-2023-43747 Référence CVE CVE-2023-45229 https://www.cve.org/CVERecord?id=CVE-2023-45229 Référence CVE CVE-2023-45230 https://www.cve.org/CVERecord?id=CVE-2023-45230 Référence CVE CVE-2023-45231 https://www.cve.org/CVERecord?id=CVE-2023-45231 Référence CVE CVE-2023-45232 https://www.cve.org/CVERecord?id=CVE-2023-45232 Référence CVE CVE-2023-45233 https://www.cve.org/CVERecord?id=CVE-2023-45233 Référence CVE CVE-2023-45234 https://www.cve.org/CVERecord?id=CVE-2023-45234 Référence CVE CVE-2023-45235 https://www.cve.org/CVERecord?id=CVE-2023-45235 Référence CVE CVE-2023-45236 https://www.cve.org/CVERecord?id=CVE-2023-45236 Référence CVE CVE-2023-45237 https://www.cve.org/CVERecord?id=CVE-2023-45237 Référence CVE CVE-2023-48361 https://www.cve.org/CVERecord?id=CVE-2023-48361 Référence CVE CVE-2023-49141 https://www.cve.org/CVERecord?id=CVE-2023-49141 Référence CVE CVE-2023-49144 https://www.cve.org/CVERecord?id=CVE-2023-49144 Référence CVE CVE-2024-21766 https://www.cve.org/CVERecord?id=CVE-2024-21766 Référence CVE CVE-2024-21769 https://www.cve.org/CVERecord?id=CVE-2024-21769 Référence CVE CVE-2024-21784 https://www.cve.org/CVERecord?id=CVE-2024-21784 Référence CVE CVE-2024-21787 https://www.cve.org/CVERecord?id=

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-025401Tianocore の EDK2 における暗号の脆弱な PRNG の使用に関する脆弱性

Tianocore の EDK2 には、暗号の脆弱な PRNG の使用に関する脆弱性が存在します。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
The problems are corrected in the following product versions: - APC4100 1.09 - APC910 No patch will be released (Please refer to the mitigation measures specified in this advisory). - C80 1.14 - MPC3100 1.24 - PPC1200 1.14 - PPC900 2.16 - APC2200 1.35 - PPC2200 1.35 - APC3100 1.45 - PPC3100 1.45 B&R recommends that customers apply the update at earliest convenience. The process to install updates is described in the user manual. The step to identify the installed product version is described in the user manual.
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 16 Jan 2024 · Last source change 4 Nov 2025, 18:17 UTC · CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2023-49542
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    edk2-stable202308 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    edk2-stable202308 · Fixed: The problems are corrected in the following product versions: - APC4100 1.09 - APC910 No patch will be released (Please refer to the mitigation measures specified in this advisory). - C80 1.14 - MPC3100 1.24 - PPC1200 1.14 - PPC900 2.16 - APC2200 1.35 - PPC2200 1.35 - APC3100 1.45 - PPC3100 1.45 B&R recommends that customers apply the update at earliest convenience. The process to install updates is described in the user manual. The step to identify the installed product version is described in the user manual.
    ABB Product Security Incident Response Team (PSIRT) ↗
  2. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    ABB Product Security Incident Response Team (PSIRT) ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added remediation: br-automation.com/SA24P003-bb9ea116.pdf; removed remediation: nvd.nist.gov/CVE-2023-45236.
    Before
    remediation: nvd.nist.gov/CVE-2023-45236
    After
    remediation: br-automation.com/SA24P003-bb9ea116.pdf
    ABB Product Security Incident Response Team (PSIRT) ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release recorded from official guidance
ENISA EUVD · EUVD-2023-49542↗Vendor CSAF · SUSE Product Security Team↗ABB Product Security Incident Response Team (PSIRT) security advisory↗CVE authority or vendor reference · GitHub GHSA-HC6X-CW6P-GJ7H↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2023-45236 · cve.blacktree.nl