What is CVE-2023-45236?

CVE-2023-45236 is a medium-severity vulnerability in Tianocore Edk2, classified under Information Disclosure. CVSS score: 5.8/10. Published 2024-01-16.

How severe is CVE-2023-45236?

Medium severity. CVSS v3 base score is 5.8 out of 10.

Is CVE-2023-45236 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Tianocore Edk2

CVE-2023-45236

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.

Vulnerability class: Information Disclosure

Published 2024-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (61.3th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Tianocore Edk2 — versions edk2-stable202308

Weakness classification (CWE)

Public proof-of-concept exploits

References

github.com/tianocore/edk2/security/advisories/GHSA-hc6x-cw6p-gj7h (Vendor Advisory)
www.openwall.com/lists/oss-security/2024/01/16/2 (Mailing List)
security.netapp.com/advisory/ntap-20240307-0011/
af854a3a-2127-422b-91ae-364da2661108

Frequently asked questions

What is CVE-2023-45236?: CVE-2023-45236 is a medium-severity vulnerability in Tianocore Edk2, classified under Information Disclosure. CVSS score: 5.8/10. Published 2024-01-16.
How severe is CVE-2023-45236?: Medium severity. CVSS v3 base score is 5.8 out of 10.
Is CVE-2023-45236 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.