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Fencer Vulns
medium 5.8

CVE-2023-45236 json

Predictable TCP ISNs in EDK II Network Package

published 2024-01-16 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-49542

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 62%
public exploits
0
none known

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.

Patch / fix

  • edk2 Debian 14, Debian 13 2024.05-1

debian advisories DEBIAN-CVE-2023-45236

  • edk2 RHEL 8 20220126gitbb1bba3d77-13.el8_10.2
  • edk2-ovmf RHEL 8 20220126gitbb1bba3d77-13.el8_10.2
  • edk2-aarch64 RHEL 8 20220126gitbb1bba3d77-13.el8_10.2
  • edk2 RHEL 9 20231122-6.el9_4.2
  • edk2-ovmf RHEL 9 20231122-6.el9_4.2
  • edk2-tools RHEL 9 20231122-6.el9_4.2
  • edk2-aarch64 RHEL 9 20231122-6.el9_4.2
  • edk2 RHEL 9.2 EUS 20221207gitfff6d81270b5-9.el9_2.3

red hat advisories RHSA-2024:4419RHSA-2024:5297RHSA-2024:4749

  • ovmf SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +5 more 202202-150400.5.18.1
  • ovmf SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 202208-150500.6.9.1
  • ovmf SLE Module for Server Applications 15 SP6, SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 202308-150600.5.14.1
  • ovmf SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +5 more 202202-150400.5.15.1
  • ovmf SLE Module for Server Applications 15 SP6, SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 202308-150600.5.9.1
  • ovmf SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 202208-150500.6.6.1

suse advisories SUSE-SU-2025:0690-1SUSE-SU-2025:0609-1SUSE-SU-2025:0608-1SUSE-SU-2025:0503-1SUSE-SU-2025:0421-1SUSE-SU-2025:0407-1

  • ovmf openSUSE Tumbleweed 202405-1.1

opensuse advisories openSUSE-SU-2024:14336-1

  • edk2-ovmf AlmaLinux 8 20220126gitbb1bba3d77-13.el8_10.2
  • edk2-aarch64 AlmaLinux 8 20220126gitbb1bba3d77-13.el8_10.2
  • edk2-ovmf AlmaLinux 9 20231122-6.el9_4.2
  • edk2-tools AlmaLinux 9 20231122-6.el9_4.2
  • edk2-aarch64 AlmaLinux 9 20231122-6.el9_4.2

almalinux advisories ALSA-2024:5297ALSA-2024:4749

  • edk2 Rocky Linux 8 20220126gitbb1bba3d77-13.el8_10.2

rocky linux advisories RLSA-2024:5297

  • edk2 Azure Linux 3.0 20240223gitedc6681206c1-1
  • hvloader CBL-Mariner 2.0 1.0.1-3
  • edk2 CBL-Mariner 2.0 20230301gitf80f052277c8-40

azure linux advisories AZL-38425AZL-39388AZL-39454

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-26-141-02 updated cvss 5.8

ABB B&R PCs

  • ABB APC910 <=1.25 ABB APC2200 <1.35 ABB APC3100 <1.45 ABB APC4100 <1.09 ABB C80 <1.14 ABB MPC3100 <1.24
    +4 more products
    ABB PPC900 <2.16 ABB PPC1200 <1.14 ABB PPC2200 <1.35 ABB PPC3100 <1.45
    affected: vendor fix, mitigation
  • ABB APC2200 1.35 ABB APC3100 1.45 ABB APC4100 1.09 ABB C80 1.14 ABB MPC3100 1.24 ABB PPC900 2.16
    +3 more products
    ABB PPC1200 1.14 ABB PPC2200 1.35 ABB PPC3100 1.45
    fixed

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

red hat product security vex CVE-2023-45236 updated cvss 7.5

edk2: Predictable TCP Initial Sequence Numbers

  • Red Hat CodeReady Linux Builder EUS (v.9.2) edk2 20221207gitfff6d81270b5-9.el9_2.3, edk2-ovmf 20221207gitfff6d81270b5-9.el9_2.3, edk2-tools 20221207gitfff6d81270b5-9.el9_2.3, edk2-aarch64 20221207gitfff6d81270b5-9.el9_2.3
    fixed: vendor fix RHSA-2024:4419
  • Red Hat Enterprise Linux AppStream (v. 8) edk2 20220126gitbb1bba3d77-13.el8_10.2, edk2-ovmf 20220126gitbb1bba3d77-13.el8_10.2, edk2-aarch64 20220126gitbb1bba3d77-13.el8_10.2
    fixed: vendor fix RHSA-2024:5297
  • Red Hat Enterprise Linux AppStream (v. 9) edk2 20231122-6.el9_4.2, edk2-ovmf 20231122-6.el9_4.2, edk2-tools 20231122-6.el9_4.2, edk2-aarch64 20231122-6.el9_4.2
    fixed: vendor fix RHSA-2024:4749
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) edk2 20221207gitfff6d81270b5-9.el9_2.3, edk2-ovmf 20221207gitfff6d81270b5-9.el9_2.3, edk2-tools 20221207gitfff6d81270b5-9.el9_2.3, edk2-aarch64 20221207gitfff6d81270b5-9.el9_2.3
    fixed: vendor fix RHSA-2024:4419
  • Red Hat Enterprise Linux CRB (v. 9) edk2 20231122-6.el9_4.2, edk2-ovmf 20231122-6.el9_4.2, edk2-tools 20231122-6.el9_4.2, edk2-aarch64 20231122-6.el9_4.2
    fixed: vendor fix RHSA-2024:4749

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
18 mo ago

Exploit prediction

0.99% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • TianoCore edk2

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.