Security readout for executives and security teams
Plain-English summary
This issue affects Hirschmann HiSecOS Classic Firewall devices, including EAGLE and EAGLE One, before version 05.3.03. If HTTPS login is reachable and RADIUS authentication is enabled, an unauthenticated remote attacker could crash the device or potentially run code. For operational networks, the business risk is loss of firewall availability and possible device compromise.
Executive priority
Treat this as urgent for any exposed operational firewall. Patch or isolate affected management interfaces quickly, especially where device downtime could interrupt industrial or remote network operations.
Technical view
The vulnerability is a CWE-120 buffer overflow in HTTPS login password handling when RADIUS authentication is enabled. Sources state passwords longer than 128 characters can overflow a fixed-size buffer. CVSS 3.1 is 9.8, network exploitable, low complexity, no privileges, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most likely on Hirschmann HiSecOS Classic Firewall EAGLE or EAGLE One devices running versions before 05.3.03, with HTTPS management login reachable and RADIUS authentication enabled. Internet-facing or broadly reachable management interfaces materially increase urgency.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The described attack path is remote and unauthenticated, but exploitation status should be treated as unknown unless vendor or threat-intelligence sources confirm activity.
Researcher notes
Do not validate by sending oversized passwords to production devices. Focus on version, configuration, and management-plane reachability. Evidence is sufficient for affected-condition triage, but public sources in the bundle do not confirm active exploitation.
Mitigation direction
- Upgrade affected HiSecOS Classic Firewall devices to version 05.3.03 or later per Belden guidance.
- Review the Belden bulletin for supported configuration mitigations and operational constraints.
- Restrict HTTPS management access to trusted administrative networks only.
- Confirm RADIUS authentication is required and configured according to vendor guidance.
- Prioritize devices protecting critical or remote operational environments.
Validation and detection
- Inventory Hirschmann EAGLE and EAGLE One firewall models and record HiSecOS versions.
- Identify devices running HiSecOS versions earlier than 05.3.03.
- Confirm whether HTTPS login is enabled and reachable from untrusted networks.
- Confirm whether RADIUS authentication is enabled on each device.
- Review device logs for unexpected crashes, restarts, or authentication anomalies.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-120: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2018-25237 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: 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
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://assets.belden.com/m/2d5657b3e5d721c6/original/Security-Bulletin-RADIUS-Authentication-BSECV-2018-04.pdfCVE reference, VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/hirschmann-hisecos-buffer-overflow-via-https-loginCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.