Security readout for executives and security teams
Plain-English summary
This CVE affects LINE client for iOS 10.21.3 and earlier. The app could show a misleading address bar because of improper address handling, creating phishing or trust-confusion risk inside the client. The sources do not provide CVSS, CWE, business impact detail, or proof of active exploitation.
Executive priority
Treat this as a targeted mobile phishing risk, not a confirmed remote compromise issue. Prioritize updates where LINE is used for business communication or customer interaction; otherwise handle through routine mobile app hygiene.
Technical view
The published description identifies an address bar spoofing issue in LINE client for iOS through version 10.21.3. The disclosed root cause is inappropriate address handling. Available sources do not describe prerequisites, attack surface details, payload mechanics, patched version number, or validation artifacts beyond the affected version boundary.
Likely exposure
Exposure is limited to iOS devices running LINE client version 10.21.3 or earlier. Organizations should check managed and unmanaged mobile fleets where LINE is installed for customer, employee, or operational communications.
Exploitation context
CISA KEV is false in the provided bundle, and no cited source states active exploitation. The likely risk is social engineering or phishing via UI trust confusion, but the provided evidence does not prove exploitation in the wild.
Researcher notes
The public record is sparse: no CVSS vector, CWE, proof-of-concept detail, exploit status, or explicit fixed version is included in the supplied bundle. Avoid assuming browser engine impact or account takeover without additional vendor evidence.
Mitigation direction
- Inventory iOS devices with LINE installed and record client versions.
- Update LINE for iOS to a version later than 10.21.3 or the current App Store release.
- Review vendor or HackerOne guidance for any additional remediation notes.
- Warn users not to trust links based only on in-app address display.
- Prioritize managed devices used for customer or financial communications.
Validation and detection
- Confirm no managed iOS device runs LINE 10.21.3 or earlier.
- Verify MDM or app inventory reports include unmanaged-risk exceptions.
- Check whether LINE is approved for business communication workflows.
- Review security awareness material for mobile phishing coverage.
- Monitor vendor advisories for clarifications on fixed versions.
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.
CVE-2021-36215 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://hackerone.com/reports/1082991CVE 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.