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HIGH

CVE-2026-21411

CVE-2026-21411 Vulnerability Analysis & Exploit Intelligence

Authentication bypass issue exists in OpenBlocks series versions prior to FW5.0.8, which may allow an attacker to bypass administrator authentication and change the password.

Published Updated Sources: cvelistV5, jpcert

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

0%

chance of exploitation in 30 days

Affects

plat home co

6 products listed

CVSS base

8.7

HIGH

CISA SSVC assessment

Three decision points CISA publishes for the CVEs it assesses · SSVC 2.0.3. A stakeholder decision, not a severity score.

CISA

Exploitation

None

none · proof-of-concept · active

Automatable

No

can an attacker script all four kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Affected scope

The catalog records vendors and products as separate lists, not pairs, so which product belongs to which vendor is not something this page can say.

Vendors (1)

plat home co

Products (6)

openblocks iot dx1 fw5 0 xopenblocks iot ex bx models fw5 0 xopenblocks ix9 models with fw fw5 0 xopenblocks iot vx2 fw5 0 xopenblocks idm rx1 fw5 0 xopenblocks iot fx1 fw5 0 x

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactSource
8.7CVSS 4.0HIGH——cvelistV5

Weakness & attack patterns

  • CWE-288

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

  • T1083File and Directory Discovery
  • T1211Exploitation for Defensive Evasion
  • T1542.002Pre-OS Boot: Component Firmware

References

2 on the record

Elsewhere on this site

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.