medium 5.3

CVE-2023-45237 json

Use of a Weak PseudoRandom Number Generator in EDK II Network Package

published 2024-01-16 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-49543

cvss: 5.3; 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

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

distros 7

debian red hat suse opensuse almalinux rocky linux azure linux

edk2 Debian 14, Debian 13 2024.05-1

debian advisories DEBIAN-CVE-2023-45237

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-2024:4419 RHSA-2024:5297 RHSA-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-2025:0690-1 SUSE-SU-2025:0609-1 SUSE-SU-2025:0608-1 SUSE-SU-2025:0503-1 SUSE-SU-2025:0421-1 SUSE-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-2024:5297 ALSA-2024:4749

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

rocky linux advisories RLSA-2024:5297

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

azure linux advisories AZL-38164 AZL-39220 AZL-39541

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 2026-05-21 cvss 5.3

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 productsfewer

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 productsfewer

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-2023-45237 updated 2025-11-21 cvss 7.5

edk2: Use of a Weak PseudoRandom Number Generator

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: 23 mo ago (2024-11-13)

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	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

References

github.com /tianocore/edk2/security/advisories/GHSA-hc6x-cw6p-gj7h
vendor-advisory
openwall.com /lists/oss-security/2024/01/16/2
mailing-list
security.netapp.com /advisory/ntap-20240307-0011/
kb.cert.org /vuls/id/132380

Sources

CVE List CVE-2023-45237
NVD CVE-2023-45237

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.

Summary