Security readout for executives and security teams
Plain-English summary
CVE-2025-64056 is a reported unauthenticated file upload issue in Fanvil X210 V2 firmware 2.12.20. An attacker already on the local network could store arbitrary files on the device filesystem. The published severity is medium because the attack is local-network scoped and the cited impact is limited integrity impact, not confirmed data theft or outage.
Executive priority
Treat this as a moderate, network-segmentation-driven issue. It is not presented as internet-wide or actively exploited, but unauthenticated changes to device files are still undesirable on corporate voice infrastructure. Prioritize identifying affected phones and limiting local-network reachability while awaiting or applying vendor guidance.
Technical view
The CVE describes CWE-306: missing authentication for a file upload path. CVSS 3.1 is 4.3 with adjacent-network access, low complexity, no privileges, and no user interaction. The stated impact is arbitrary file storage on the filesystem. The source bundle does not identify a vendor patch, workaround, or broader affected version range.
Likely exposure
Exposure is most relevant where Fanvil X210 V2 devices running firmware 2.12.20 are reachable from user, guest, or other untrusted local networks. Internet exposure is not indicated by the CVSS vector or description. Organizations without these devices or firmware have no confirmed exposure from the provided sources.
Exploitation context
No active exploitation is reported in the provided sources, and the CVE is not listed as KEV in the bundle. The realistic concern is a local-network attacker abusing unauthenticated upload capability to place files on the phone’s filesystem. The sources do not establish remote internet exploitation or code execution.
Researcher notes
The affected-product metadata in the bundle is incomplete, but the title and description identify Fanvil X210 V2 firmware 2.12.20. Do not assume other models or versions are affected without additional evidence. Public sources provided do not name a patch, exploit activity, or full technical root-cause details beyond unauthenticated file upload.
Mitigation direction
- Check Fanvil guidance for firmware updates or official mitigations.
- Restrict device management access to trusted administration networks only.
- Segment voice devices from user, guest, and unmanaged networks.
- Block unnecessary local access to affected phones where operationally feasible.
- Monitor affected devices for unexpected file changes or abnormal behavior.
Validation and detection
- Inventory Fanvil X210 V2 devices and record firmware versions.
- Prioritize devices running firmware 2.12.20 for review.
- Confirm management interfaces are not reachable from untrusted local networks.
- Review the linked advisory and CVE record for updated vendor information.
- Check whether Fanvil has published a fixed firmware or workaround.
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-306: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. 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 lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2025-64056 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
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/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:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N2.81.4CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/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://github.com/SpikeReply/advisories/blob/main/cve/fanvil/cve-2025-64056.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.
Missing Authentication for Critical Function
Missing Authentication for Critical Function represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.