CVE-2023-45237Network attack vector

Information disclosure via predictable network protocol identifiers

Published Jan 16, 2024 · Updated Nov 4, 2025

Weak pseudorandom generation in TianoCore EDK II edk2-stable202308 allows remote attackers to disclose data via predictable identifiers. NetworkPkg's NET_RANDOM macro applies a linear congruential generator to clock and monotonic-counter seeds, producing predictable DNS query and IPv4 identifiers. Exposure requires PXE or HTTP boot on an untrusted network; the published impact is limited to confidentiality loss.

CVSS severity5.3
Medium
EPSS probability0.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak pseudorandom generation in TianoCore EDK II edk2-stable202308 allows remote attackers to disclose data via predictable identifiers. NetworkPkg's NET_RANDOM macro applies a linear congruential generator to clock and monotonic-counter seeds, producing predictable DNS query and IPv4 identifiers. Exposure requires PXE or HTTP boot on an untrusted network; the published impact is limited to confidentiality loss.

The record

CVE
CVE-2023-45237
Published
Jan 16, 2024
Updated
Nov 4, 2025
Vendor
TianoCore
Product
EDK II
Classifications
CWE-338
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=edk2-stable202308

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

TianoCore · EDK IIversion=edk2-stable202308

Published CVSS scores

5.3TianoCore.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-338Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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