CVE-2023-45236 | Predictable TCP ISNs in EDK II Network Package

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.

Published: 2024-01-16 Last update: 2025-11-04 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-45236 is rated Moderate Risk (43.8/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.38%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-45236

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-06-06 0.22% 0.38% +0.15%
2 2025-04-15 0.32% 0.22% -0.10%
3 2025-03-30 — 0.32% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-45236

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2023-45236

OS Trackers for CVE-2023-45236

vendor priority summary link
alpine medium CVE-2023-45236: 1 source package rows (edk2); 7 state rows across 4 repos (3.19-community, 3.20-community, 3.22-community, edge-community); fixed 0, open 7. https://security.alpinelinux.org/vuln/CVE-2023-45236
debian not yet assigned CVE-2023-45236 not yet assigned priority: Debian including 1 source packages (edk2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2023-45236
redhat medium — https://access.redhat.com/security/cve/CVE-2023-45236
suse medium CVE-2023-45236 severity moderate: SUSE including 35 source package names (edk2-ovmf-20220126gitbb1bba3d77-13.el8_10.2, edk2-ovmf-20231122-6.el9_4.2, …), 83 product×package rows across 23 product lines (SUSE Liberty Linux 8, SUSE Liberty Linux 9, … (23 product lines)): Fixed 83. https://www.suse.com/security/cve/CVE-2023-45236/
ubuntu medium CVE-2023-45236 medium priority: Ubuntu including 1 source packages (edk2), 12 status rows across 12 suites (bionic, focal, jammy, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 9, not-affected 2, released 1. https://ubuntu.com/security/CVE-2023-45236

Affected software / configurations for CVE-2023-45236

Vendor Product Version Raw CPE
tianocore edk2 <= 202311 cpe:2.3:a:tianocore:edk2:*:*:*:*:*:*:*:*

References for CVE-2023-45236

cvelogic Threat Intelligence