Hirschmann HiOS HiSecOS Authentication Bypass via HTTP Management
Published Apr 3, 2026
9.3
CRITICALCVSS 4.0
EPSS 0.50%
Description
Hirschmann HiOS and HiSecOS products RSP, RSPE, RSPS, RSPL, MSP, EES, EESX, GRS, OS, RED, EAGLE contain an authentication bypass vulnerability in the HTTP(S) management module that allows unauthenticated remote attackers to gain administrative access by crafting specially formed HTTP requests. Attackers can exploit improper authentication handling to obtain the authentication status and privileges of a previously authenticated user without providing valid credentials.
Affected products
-
- Version 0StatusaffectedConstraints<=05.07
- Version 0StatusaffectedConstraints<=06.1.04
- Version 0StatusaffectedConstraints<=06.2.00
- Version 03.1.00StatusunaffectedConstraints-
- Version 06.1.05StatusunaffectedConstraints-
- Version 07.0.00StatusunaffectedConstraints-
- Version
-
- Version 0StatusaffectedConstraints<=03.00.02
- Version 03.0.03StatusunaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Belden | Hirschmann HiOS | unaffected |
| |||||||||||||||||||||
| Belden | Hirschmann HiSecOS EAGLE | unaffected |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Apr 6, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Apr–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.50% (0.00502) | 40.75th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.50% (0.00502) | 38.73th | v5 (v2026.06.15) |
| Apr 4, 2026 | 0.02% (0.00022) | 5.93th | v4 (v2025.03.14) |
References (2)
Change history (0)
No recorded changes yet.