CVE-2021-27734

CRITICAL
9.8
CVSS Score
Published: May 17, 2021 at 02:28 PM UTC
Updated: June 17, 2026 at 03:45 AM UTC
2 products affected across 1 vendorHirschmann HiOSHisecos

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Severity
CRITICAL9.8
Exploit prediction
EPSS 1%

Description

Hirschmann HiOS 07.1.01, 07.1.02, and 08.1.00 through 08.5.xx and HiSecOS 03.3.00 through 03.5.01 allow remote attackers to change the credentials of existing users.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

08.1.00 ≤ v < 08.6.007.1.017.1.02
Affected range stops below 08.6.00, so it looks safe — our inference, not a vendor statement
03.3.00 ≤ v ≤ 03.5.01

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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