Hirschmann HiSecOS Buffer Overflow via HTTPS Login
Published Apr 3, 2026
9.3
CRITICALCVSS 4.0
EPSS 0.82%
Description
Hirschmann HiSecOS devices versions prior to 05.3.03 contain a buffer overflow vulnerability in the HTTPS login interface when RADIUS authentication is enabled that allows remote attackers to crash the device or execute arbitrary code by submitting a password longer than 128 characters. Attackers can exploit improper bounds checking in password handling to overflow a fixed-size buffer and achieve denial of service or remote code execution.
Affected products
-
- Version 0StatusaffectedConstraints<=05.3.02
- Version 05.3.03StatusunaffectedConstraints-
- 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 HiSecOS Classic Firewall (EAGLE, EAGLE One) | affected |
|
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 1, 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 1, 2026 | 0.82% (0.00817) | 55.55th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.82% (0.00817) | 52.16th | v5 (v2026.06.15) |
| Apr 4, 2026 | 0.08% (0.00080) | 23.86th | v4 (v2025.03.14) |
References (2)
- https://assets.belden.com/m/2d5657b3e5d721c6/original/Security-Bulletin-RADIUS-Authentication-BSECV-2018-04.pdf vendor-advisory
- https://www.vulncheck.com/advisories/hirschmann-hisecos-buffer-overflow-via-https-login third-party-advisory
| Link | Providers | Tags |
|---|---|---|
| https://assets.belden.com/m/2d5657b3e5d721c6/original/Security-Bulletin-RADIUS-Authentication-BSECV-2018-04.pdf | vendor-advisory | |
| https://www.vulncheck.com/advisories/hirschmann-hisecos-buffer-overflow-via-https-login | third-party-advisory |
Change history (0)
No recorded changes yet.