This Power System Buffer Overflow

published 2026-08-19 2 mo ago modified 2026-08-25 2 mo ago also EUVD-2026-62683

cvss: 6.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

IBM Server Firmware FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the FSP firmware update process. An attacker with authenticated administrator-level access to the FSP can, under specific conditions, execute arbitrary code, resulting in a confidentiality, integrity, and availability impact.

Patch / fix

fixed in 9 links 1

ibm power_system_s922_(9009-22g)_firmware fw950.h3
ibm power_system_h922_(9223-22s)_firmware fw950.h3
ibm power_system_s914_(9009-41g)_firmware fw950.h3
ibm power_system_s924_(9009-42g)_firmware fw950.h3
ibm power_system_h924_(9223-42s)_firmware fw950.h3
ibm power_system_e950_(9040-mr9)_firmware fw950.h3
ibm power_system_e980_(9080-m9s)_firmware fw950.h3
ibm power_system_e1080_(9080-hex)_firmware fw1060.81
ibm power_system_e1180_(9080-heu)_firmware fw1110.31

ibm.com/support/pages/node/7283899 advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-08-19)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.8	CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Affected products

IBM Server Firmware

Classification

Weakness

CWE-121 Stack-based Buffer Overflow

References

ibm.com /support/pages/node/7283899
vendor-advisory, patch

Sources

CVE List CVE-2026-18681
NVD CVE-2026-18681

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary