CVE-2023-43632

vTPM service crash via unbounded stack allocation

Published Sep 21, 2023 · Updated Sep 24, 2024

Stack overflow in the vTPM server in LF Edge EVE before 9.5.0 allows guest OS users to crash the service via a crafted request. handleRequest interprets the four-byte protobuf header as an unsigned payload length and allocates that attacker-controlled size on the stack without a bound. Reachability requires code executing in a container or virtual machine on the EVE host; successful exploitation interrupts the vTPM service, while the CNA also reports control of its highly privileged process.

CVSS severity9.0
Critical
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack overflow in the vTPM server in LF Edge EVE before 9.5.0 allows guest OS users to crash the service via a crafted request. handleRequest interprets the four-byte protobuf header as an unsigned payload length and allocates that attacker-controlled size on the stack without a bound. Reachability requires code executing in a container or virtual machine on the EVE host; successful exploitation interrupts the vTPM service, while the CNA also reports control of its highly privileged process.

The record

CVE
CVE-2023-43632
Published
Sep 21, 2023
Updated
Sep 24, 2024
Vendor
LF Edge
Product
EVE-OS
Classifications
CWE-789, CWE-770, CAPEC-100, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 2024Record 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=3.0.0 <9.5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

LF Edge · EVE-OSversion=3.0.0 <9.5.0
LF Edge · EVEversion=3.0.0 <9.5.0

Published CVSS scores

9.0Automotive Security Research GroupCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
6.5LF Edge GitHub Security AdvisoryCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
9.9NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-789Memory Allocation with Excessive Size Value
CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-100Overflow Buffers
T1499Endpoint Denial of Service

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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