CVE-2026-33554Public exploitNetwork attack vector

Client crash via unchecked IPMI response lengths

Published Mar 24, 2026 · Updated Mar 24, 2026

Stack buffer overflows in FreeIPMI before 1.6.17 allow remote attackers controlling an IPMI endpoint to crash the ipmi-oem client. Three vendor-specific handlers parse malformed response fields into fixed-size stack storage without adequately validating response lengths. Exploitation requires supported Dell, Supermicro, or Wistron hardware, an affected OEM subcommand, and a malicious or simulated IPMI responder.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflows in FreeIPMI before 1.6.17 allow remote attackers controlling an IPMI endpoint to crash the ipmi-oem client. Three vendor-specific handlers parse malformed response fields into fixed-size stack storage without adequately validating response lengths. Exploitation requires supported Dell, Supermicro, or Wistron hardware, an affected OEM subcommand, and a malicious or simulated IPMI responder.

The record

CVE
CVE-2026-33554
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5MITRECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

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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