IBM i is Affected By Improper Authorization and Authentication Vulnerabilities in DDM / DRDA [, ]

published 2026-09-04 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-71607

cvss: 8.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits: 0; none known

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to gain unauthorized access due to improper validation of client-supplied authentication parameters.

Patch / fix

links 1

ibm.com/support/pages/node/7286186 advisory

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-09-08)

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

IBM i

Classification

Weakness

CWE-287 Improper Authentication

References

ibm.com /support/pages/node/7286186
vendor-advisory, patch

Sources

CVE List CVE-2026-18221
NVD CVE-2026-18221

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