CVE-2026-24795

Pre-boot service interruption via regex buffer overwrite

Published Jan 27, 2026 · Updated Jan 27, 2026

Out-of-bounds write in CloverBootloader before 5162 allows local users to interrupt boot services through a crafted regular expression. The concat_opt_exact_str() function permits a multibyte character to fill the fixed optimization buffer exactly, then writes beyond its end while copying the character bytes. Exploitation requires local access to reach regular-expression compilation in the pre-boot environment and can corrupt memory, disrupting the bootloader and associated firmware service.

CVSS severity5.1
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in CloverBootloader before 5162 allows local users to interrupt boot services through a crafted regular expression. The concat_opt_exact_str() function permits a multibyte character to fill the fixed optimization buffer exactly, then writes beyond its end while copying the character bytes. Exploitation requires local access to reach regular-expression compilation in the pre-boot environment and can corrupt memory, disrupting the bootloader and associated firmware service.

The record

CVE
CVE-2026-24795
Published
Jan 27, 2026
Updated
Jan 27, 2026
Vendor
CloverHackyColor
Product
CloverBootloader
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 27, 2026Record 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=0 <5162

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

CloverHackyColor · CloverBootloaderversion=0 <5162

Published CVSS scores

5.1Government Technology Agency of Singapore Cyber Security GroupCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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