TI-2023-24241 Aliases CVE-2023-45236 GHSA-fqc4-ffq5-4r98

Predictable TCP ISNs in EDK II Network Package

MEDIUM 41CWE-200Published 2024-01-16 · Updated 2025-11-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-200.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00994 62nd percentileScored 2026-11-07

Fix Fixed Red Hat: 3 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
TianoCore	edk2	edk2-stable202308	—	No fix listed	CNA

edk2 VendorTianoCore Affected edk2-stable202308 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tianocore:edk2::::::::	up to 202311	Vulnerable	TianoCore

cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:* Versions up to 202311 Vulnerable ·TianoCore

Remediation

Red Hat 3 advisories

RHSA-2024:5297 Released 2024-08-13 · Red Hat rating Moderate
edk2 security update
- Red Hat Enterprise Linux AppStream (v. 8) edk2-20220126gitbb1bba3d77-13.el8_10.2, edk2-aarch64-20220126gitbb1bba3d77-13.el8_10.2, edk2-ovmf-20220126gitbb1bba3d77-13.el8_10.2
RHSA-2024:4749 Released 2024-07-23 · Red Hat rating Moderate
edk2 security update
- Red Hat Enterprise Linux AppStream (v. 9) edk2-20231122-6.el9_4.2, edk2-aarch64-20231122-6.el9_4.2, edk2-ovmf-20231122-6.el9_4.2
- Red Hat Enterprise Linux CRB (v. 9) edk2-aarch64-20231122-6.el9_4.2, edk2-ovmf-20231122-6.el9_4.2, edk2-tools-20231122-6.el9_4.2 +1
RHSA-2024:4419 Released 2024-07-09 · Red Hat rating Important
edk2 security update
- Red Hat CodeReady Linux Builder EUS (v.9.2) edk2-aarch64-20221207gitfff6d81270b5-9.el9_2.3, edk2-ovmf-20221207gitfff6d81270b5-9.el9_2.3, edk2-tools-20221207gitfff6d81270b5-9.el9_2.3 +1
- Red Hat Enterprise Linux AppStream EUS (v.9.2) edk2-20221207gitfff6d81270b5-9.el9_2.3, edk2-aarch64-20221207gitfff6d81270b5-9.el9_2.3, edk2-ovmf-20221207gitfff6d81270b5-9.el9_2.3

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat CodeReady Linux Builder EUS (v.9.2)	Fixed	RHSA-2024:4419
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2024:5297
Red Hat Enterprise Linux AppStream (v. 9)	Fixed	RHSA-2024:4749
Red Hat Enterprise Linux AppStream EUS (v.9.2)	Fixed	RHSA-2024:4419
Red Hat Enterprise Linux CRB (v. 9)	Fixed	RHSA-2024:4749

Timeline

2026-10-02 Threatist record created from CVE-2023-45236
2026-10-03 Alias added: GHSA-fqc4-ffq5-4r98

References

Advisory 1

https://github.com/tianocore/edk2/security/advisories/GHSA-hc6x-cw6p-gj7h

Other 2

TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
TI-2023-24240 Buffer Overflow in EDK II Network Package CVSS 3.1HIGH 8.8
TI-2023-24238 Infinite loop in EDK II Network Package CVSS 3.1HIGH 7.5
TI-2023-24235 Buffer Overflow in EDK II Network Package CVSS 3.1HIGH 8.8
TI-2023-26565 An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. CVSS 3.1MEDIUM 6.7
TI-2023-24236 Out-of-Bounds Read in EDK II Network Package CVSS 3.1MEDIUM 6.5

See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences