Security readout for executives and security teams
Plain-English summary
This issue affects the web interface of the Yealink/Yeahlink SIP-T41P IP phone firmware 66.83.0.35. A malicious link could cause a victim’s browser to make unwanted changes to the phone, with the CVE describing possible settings modification or code execution.
Executive priority
Prioritize review if SIP-T41P phones are deployed. Business risk is highest where phone management interfaces are reachable and users can be targeted with malicious links. Lack of patch details in the provided sources means vendor verification is necessary.
Technical view
CVE-2018-16218 is a CSRF vulnerability in the SIP-T41P web interface. The public description says a remote attacker can provide a crafted link to a victim and trigger code execution or configuration changes on the device. No CVSS vector, CWE, patch details, or affected-version range beyond firmware 66.83.0.35 is provided.
Likely exposure
Likely exposure is limited to environments using SIP-T41P phones on firmware 66.83.0.35 with the web management interface reachable from user or administrator browsers. The provided CVE data does not identify other models, firmware versions, or deployment conditions.
Exploitation context
CISA KEV is false in the supplied bundle, and no cited source states active exploitation. The described attack path is social-engineering driven: a victim is induced to open a crafted link that abuses the phone’s web interface behavior.
Researcher notes
The source bundle is sparse: it identifies CSRF, SIP-T41P firmware 66.83.0.35, and possible code execution or settings modification, but provides no CVSS, CWE, exploit status, or confirmed remediation. Do not broaden affected scope without vendor evidence.
Mitigation direction
- Check Yealink vendor guidance for fixed firmware or official mitigations.
- Restrict access to phone web management interfaces to trusted admin networks.
- Disable unnecessary web management exposure where operationally possible.
- Review device configurations for unexpected changes after suspected exposure.
- Treat firmware 66.83.0.35 as needing priority review.
Validation and detection
- Inventory SIP-T41P devices and record firmware versions.
- Confirm whether firmware 66.83.0.35 is present in the environment.
- Verify web management interfaces are not broadly reachable.
- Review logs or configuration baselines for unexplained phone setting changes.
- Track vendor advisory updates before assuming complete remediation.
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.
Execution 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 lookupCVE-2018-16218 mapping review
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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://www.sit.fraunhofer.de/de/securitytestlab/CVE reference · x_refsource_MISC
- https://www.sit.fraunhofer.de/fileadmin/dokumente/CVE/Advisory_Yealink_Ultra-elegantIPPhone_SIPT41P.pdf?_=1549375271CVE 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.