Vulnerability Name:

CVE-2021-27734 (CCN-202007)

Assigned:2021-05-11
Published:2021-05-11
Updated:2022-07-12
Summary: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.
CVSS v3 Severity:9.8 Critical (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
9.8 Critical (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
8.5 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.5 High (CVSS v2 Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
10.0 High (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-287
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2021-27734

Source: CCN
Type: BSECV-2020-10
Password Change Authentication Bypass Vulnerability in HiOS & HiSecOS

Source: MISC
Type: Vendor Advisory
https://dam.belden.com/dmm3bwsv3/assetstream.aspx?assetid=12914&mediaformatid=50063&destinationid=10016

Source: XF
Type: UNKNOWN
hios-cve202127734-sec-bypass(202007)

Vulnerable Configuration:Configuration 1:
  • cpe:/o:belden:hirschmann_hios:*:*:*:*:*:*:*:* (Version >= 08.1.00 and < 08.6.00)
  • OR cpe:/o:belden:hisecos:*:*:*:*:*:*:*:* (Version >= 03.3.00 and <= 03.5.01)
  • OR cpe:/o:belden:hirschmann_hios:07.1.02:*:*:*:*:*:*:*
  • OR cpe:/o:belden:hirschmann_hios:07.1.01:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    BACK
    belden hirschmann hios *
    belden hisecos *
    belden hirschmann hios 07.1.02
    belden hirschmann hios 07.1.01