Security readout for executives and security teams
Plain-English summary
CVE-2025-71056 is a high-severity session management flaw reported in GCOM EPON 1GE ONU firmware C00R371V00B01. An attacker with network access and low privileges may be able to impersonate an authenticated user by spoofing that user’s IP address, risking unauthorized access to device management functions.
Executive priority
Treat this as a high-priority network-edge exposure issue if matching devices exist. Prioritize inventory, management-plane restriction, and vendor remediation tracking before broader operational rollout.
Technical view
The CVE describes improper session management mapped to CWE-290. CVSS 3.1 is 8.1 with network attack vector, low complexity, low privileges required, no user interaction, and high confidentiality and integrity impact. The structured affected-product fields are incomplete, so product and firmware confirmation should rely on device inventory and vendor/OEM evidence.
Likely exposure
Exposure is most likely where GCOM EPON 1GE ONU devices running C00R371V00B01 have management interfaces reachable from user, customer, or untrusted network segments.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The described attack depends on spoofing an authenticated user’s IP address and having network reachability to the target device.
Researcher notes
Evidence is limited: the CVE description names the product/version, while structured affected fields are n/a. No patch details or active exploitation evidence are included. Focus research on firmware identification, session binding behavior, and vendor/OEM confirmation.
Mitigation direction
- Check vendor or OEM guidance for fixed firmware or configuration changes.
- Restrict device management access to trusted administrator networks only.
- Disable remote management where it is not operationally required.
- Segment ONU management planes from customer and general user networks.
- Monitor for unexpected administrator sessions or source-address changes.
Validation and detection
- Inventory GCOM EPON 1GE ONU devices and confirm firmware C00R371V00B01.
- Identify whether management interfaces are reachable from untrusted segments.
- Review logs for unusual session reuse or administrative activity.
- Check vendor/OEM channels for advisories, fixed firmware, or mitigations.
- Validate changes in an authorized lab without attempting hijacking on production devices.
Public sources used
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-290: 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 lookupCVE-2025-71056 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
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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
1 official scoreWe 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:L/UI:N/S:U/C:H/I:H/A:N2.85.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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://johnbai.en.made-in-china.com/product/JXnENzmlJFpv/China-H18gn-Series-Gpon-Ont-ONU.htmlCVE reference, mitre
- https://github.com/theShinigami/CVE-Disclosures/blob/main/CVE-2025-71056/README.mdCVE reference, mitre
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.
Authentication Bypass by Spoofing
Authentication Bypass by Spoofing represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.