CVE-2023-45840Public exploitNetwork attack vector

Builder command execution via unhashed fallback archive

Published Dec 5, 2023 · Updated Nov 4, 2025

Code integrity failure in Buildroot 2023.08.1 and dev commit 622698d7847 allows man-in-the-middle attackers to execute arbitrary builder commands. The riscv64-elf-toolchain definition lacks a hash file, while dl-wrapper accepts that absence and can fall back from HTTPS to the default HTTP mirror. An attacker able to block primary HTTPS downloads and replace the fallback archive can run Makefile or patch commands and alter generated files.

CVSS severity8.1
High
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code integrity failure in Buildroot 2023.08.1 and dev commit 622698d7847 allows man-in-the-middle attackers to execute arbitrary builder commands. The riscv64-elf-toolchain definition lacks a hash file, while dl-wrapper accepts that absence and can fall back from HTTPS to the default HTTP mirror. An attacker able to block primary HTTPS downloads and replace the fallback archive can run Makefile or patch commands and alter generated files.

The record

CVE
CVE-2023-45840
Published
Dec 5, 2023
Updated
Nov 4, 2025
Vendor
Buildroot
Product
Buildroot
Classifications
CWE-494, T1195.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 5, 2023CVE 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2023.08.1
  2. Affected versionversion=dev commit 622698d7847

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Buildroot · Buildrootversion=2023.08.1; version=dev commit 622698d7847

Published CVSS scores

8.1Cisco TalosCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitPublished

Weakness, pattern, technique

CWE-494Download of Code Without Integrity Check
T1195.002Compromise Software Supply Chain

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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