CVE-2026-18681

Administrator code execution via firmware update overflow

Published Aug 19, 2026 · Updated Aug 19, 2026

Stack-based buffer overflow in IBM Server Firmware allows remote authenticated users with FSP administrator access to execute arbitrary code. IBM identifies the FSP firmware update process as the vulnerable locus but does not disclose the affected routine, malformed field, or incorrect memory operation. Exploitation requires adjacent-network FSP administrator access on FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, or FW950.00 through FW950.H2.

CVSS severity6.8
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in IBM Server Firmware allows remote authenticated users with FSP administrator access to execute arbitrary code. IBM identifies the FSP firmware update process as the vulnerable locus but does not disclose the affected routine, malformed field, or incorrect memory operation. Exploitation requires adjacent-network FSP administrator access on FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, or FW950.00 through FW950.H2.

The record

CVE
CVE-2026-18681
Published
Aug 19, 2026
Updated
Aug 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121
Attack vector
adjacent
Privileges
admin

Timeline

How it unfolded

  1. Aug 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 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 vectoradjacent
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.8IBMCVSS:3.1/AV:A/AC:L/PR:H/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.

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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)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow

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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