CVE-2024-29979

Temporary denial of service via unsafe UEFI variable

Published Jan 14, 2025 · Updated Jul 28, 2025

Improper condition handling in Phoenix SecureCore firmware before the listed branch fixes allows local users to cause a temporary service interruption. Phoenix SCT handles a Phoenix-specific UEFI variable without safely rejecting an exceptional value, leading to unsafe memory access. Administrative firmware-variable access is required, and the documented consequence is temporary denial of service rather than data disclosure or code execution.

CVSS severity4.6
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper condition handling in Phoenix SecureCore firmware before the listed branch fixes allows local users to cause a temporary service interruption. Phoenix SCT handles a Phoenix-specific UEFI variable without safely rejecting an exceptional value, leading to unsafe memory access. Administrative firmware-variable access is required, and the documented consequence is temporary denial of service rather than data disclosure or code execution.

The record

CVE
CVE-2024-29979
Published
Jan 14, 2025
Updated
Jul 28, 2025
Vendor
Phoenix Technologies
Product
SecureCore for Intel Ice Lake
Classifications
CWE-754, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 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=0 <4.2.0.334

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Phoenix Technologies · SecureCore for Intel Ice Lakeversion=0 <4.2.0.334
Phoenix Technologies · SecureCore for Intel Comet Lakeversion=0 <4.2.1.292
Phoenix Technologies · SecureCore for Intel Kaby Lakeversion=0 <4.0.1.1012
Phoenix Technologies · SecureCore for Intel Coffee Lakeversion=0 <4.1.0.568

Published CVSS scores

4.6Phoenix Technologies, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L
2.3Phoenix Technologies, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A: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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1499.004Endpoint Denial of Service: Application 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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