Hirschmann HiOS 07.1.01, 07.1.02, and 08.1.00 through 08.5.xx and HiSecOS 03.3.00 through…
Priority MEDIUM 45CWE-287Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-287.
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.
Why it matters now
EPSS 0.01264 69th percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:belden:hirschmann_hios:*:*:*:*:*:*:*:* | 08.1.00 to before 08.6.00 | Vulnerable | Belden |
| cpe:2.3:o:belden:hirschmann_hios:07.1.01:*:*:*:*:*:*:* | 07.1.01 | Vulnerable | Belden |
| cpe:2.3:o:belden:hirschmann_hios:07.1.02:*:*:*:*:*:*:* | 07.1.02 | Vulnerable | Belden |
| cpe:2.3:o:belden:hisecos:*:*:*:*:*:*:*:* | 03.3.00 – 03.5.01 | Vulnerable | Belden |
- cpe:2.3:o:belden:hirschmann_hios:*:*:*:*:*:*:*:* Versions 08.1.00 to before 08.6.00 Vulnerable ·Belden
- cpe:2.3:o:belden:hirschmann_hios:07.1.01:*:*:*:*:*:*:* Versions 07.1.01 Vulnerable ·Belden
- cpe:2.3:o:belden:hirschmann_hios:07.1.02:*:*:*:*:*:*:* Versions 07.1.02 Vulnerable ·Belden
- cpe:2.3:o:belden:hisecos:*:*:*:*:*:*:*:* Versions 03.3.00 – 03.5.01 Vulnerable ·Belden
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-27734
- 2026-10-03 Alias added: GHSA-r6q8-h627-r6p2
References
More Belden Hirschmann Hios vulnerabilities
- TI-2019-09143 Wind River VxWorks has a Buffer Overflow in the TCP component (issue 1 of 4). CVSS 3.1CRITICAL 9.8
- TI-2019-09145 Wind River VxWorks 6.6 through 6.9 has a Buffer Overflow in the DHCP client component. CVSS 3.1HIGH 8.8
- TI-2019-09144 Wind River VxWorks 6.9 and vx7 has a Buffer Overflow in the IPv4 component. CVSS 3.1CRITICAL 9.8
- TI-2019-09148 Wind River VxWorks 6.9 and vx7 has a Buffer Overflow in the TCP component (issue 2 of 4). CVSS 3.1CRITICAL 9.8
- TI-2019-09153 Wind River VxWorks 6.5, 6.6, 6.7, 6.8, 6.9.3 and 6.9.4 has a Memory Leak in the IGMPv3… CVSS 3.1MEDIUM 5.3
- TI-2019-09149 Wind River VxWorks 6.7 though 6.9 and vx7 has a Buffer Overflow in the TCP component… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-27734 · CVE Program
- CVE-2021-27734 · NVD
- FIRST EPSS
- GHSA-r6q8-h627-r6p2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences