Security readout for executives and security teams
Plain-English summary
CVE-2021-21736 affects a ZTE ZXHN HS562 smart camera. A revoked shared user may still be able to control the camera, including rebooting it or restoring factory settings. The business risk is unauthorized disruption or control of a physical security or monitoring device after access should have ended.
Executive priority
Treat this as a targeted device governance issue, not a broad emergency. Prioritize sites using the affected camera for security, safety, or privacy-sensitive monitoring, because access removal may not actually end control.
Technical view
The issue is an access-control failure in cloud-end app user permission management for ZXHN HS562 firmware versions cited as V1.0.0.0B2.0000 and V1.0.0.0B3.0000/V1.0.0.0B3.0000E. Revocation may not remove effective control permissions for previously shared users. No CVSS, CWE, or patch details are provided in the source bundle.
Likely exposure
Exposure appears limited to deployments of the ZTE ZXHN HS562 smart camera on the listed firmware versions, especially where camera access has been shared with other users and later revoked. Organizations without this device or sharing workflow are unlikely to be affected based on the provided sources.
Exploitation context
The provided sources do not state active exploitation, and the CVE is not listed as CISA KEV. The plausible abuse scenario is a previously authorized shared user retaining control after revocation, not unauthenticated internet-wide compromise based on the available evidence.
Researcher notes
Evidence is sparse: the bundle provides affected versions and impact but no CVSS, CWE, proof-of-concept status, or explicit fix. There is also a version-text inconsistency between V1.0.0.0B3.0000 and V1.0.0.0B3.0000E, so confirm against vendor records.
Mitigation direction
- Identify any ZXHN HS562 cameras and record firmware versions.
- Check ZTE guidance for fixed firmware or vendor-recommended remediation.
- Avoid relying on app revocation alone for sensitive camera access changes.
- Rotate associated accounts or re-provision devices after removing shared users.
- Restrict physical-security use until retained-access risk is resolved.
Validation and detection
- Confirm whether deployed devices match the affected firmware versions.
- Review camera sharing history for users whose access was revoked.
- Test revocation behavior in a controlled, authorized environment.
- Verify whether vendor updates or configuration changes remove retained control.
- Document compensating controls for cameras awaiting vendor 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
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CVE-2021-21736 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://support.zte.com.cn/support/news/LoopholeInfoDetail.aspx?newsId=1015964CVE 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.