Security readout for executives and security teams
Plain-English summary
This CVE describes an authentication bypass in the web administration interface of Grandstream GRP261x VoIP phones running firmware 1.0.3.6 (Base). In business terms, an exposed management interface could let an unauthorized party administer affected phones. Source data is sparse and does not name a CVSS score or confirmed patch.
Executive priority
Prioritize inventory and management-plane isolation now. Escalate remediation for any affected phones exposed beyond trusted administration networks, while confirming vendor-supported firmware guidance.
Technical view
The record states that Grandstream GRP261x firmware 1.0.3.6 (Base) allows authentication bypass in the administrative web interface. The CWE reference points to missing authentication behavior. The source bundle does not provide affected CPEs, exploit mechanics, CVSS scoring, or a fixed firmware version.
Likely exposure
Likely exposure is limited to organizations using Grandstream GRP261x VoIP phones on firmware 1.0.3.6 (Base), especially where the administrative web interface is reachable from user networks, remote access paths, or the internet.
Exploitation context
The bundle does not cite active exploitation, and KEV status is false. However, administrative authentication bypass on VoIP infrastructure is operationally serious because management access can affect phone configuration and communications availability.
Researcher notes
Evidence is incomplete. The description names GRP261x firmware 1.0.3.6 (Base), but structured affected fields are placeholders. Do not broaden affected versions or products without vendor confirmation.
Mitigation direction
- Check Grandstream and FireEye guidance for fixed firmware or compensating controls.
- Restrict phone administrative web interfaces to trusted management networks only.
- Remove internet exposure for affected phone management interfaces.
- Review administrative credentials and configuration after remediation.
- Monitor for unexpected phone configuration changes or management access.
Validation and detection
- Inventory Grandstream GRP261x devices and firmware versions.
- Identify any devices running firmware 1.0.3.6 (Base).
- Confirm administrative web interfaces are not reachable from untrusted networks.
- Review vendor guidance for patched firmware availability.
- Check device logs for suspicious administrative access or configuration changes.
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.
Credential 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-2020-25218 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0002/FEYE-2021-0002.mdCVE reference · x_refsource_MISC
- https://cwe.mitre.org/data/definitions/306.htmlCVE reference · x_refsource_MISC
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.