Security readout for executives and security teams
Plain-English summary
This issue concerns the Home Assistant Community Add-on: SSH & Web Terminal. The reported concern is not a straightforward remote break-in; it depends on social engineering, and the vendor disputes that it is a vulnerability. Version 10.0.0 removed the addon.stdin capability as defense in depth.
Executive priority
Handle as a hygiene and hardening item, not an emergency, unless the add-on is widely used by privileged operators. Prioritize upgrade validation because the available evidence is limited and the vendor disputed vulnerability status.
Technical view
CVE-2021-45099 describes addon.stdin in addon-ssh before 10.0.0 as an attack surface requiring social engineering. The public record provides no CVSS, CWE, concrete impact, or confirmed exploit activity. The vendor reportedly disagreed with the vulnerability claim but removed addon.stdin in version 10.0.0.
Likely exposure
Exposure appears limited to environments using Home Assistant Community Add-on: SSH & Web Terminal before 10.0.0. The sources do not identify affected platforms beyond that add-on or describe direct unauthenticated network exposure.
Exploitation context
The CVE record says exploitation requires social engineering. It is not in KEV, and the provided sources do not support active exploitation or public weaponization claims.
Researcher notes
Key gaps are impact detail, exploit preconditions, and vendor-disputed vulnerability status. Analysis should stay tied to the CVE wording and the 10.0.0 release change removing addon.stdin; avoid inferring broader Home Assistant exposure from the supplied record.
Mitigation direction
- Identify installations of the SSH & Web Terminal add-on.
- Upgrade addon-ssh to version 10.0.0 or later.
- Review vendor release notes and guidance before operational changes.
- Limit administrative add-on access to trusted users only.
- Treat unsolicited terminal or add-on interaction requests as suspicious.
Validation and detection
- Confirm the installed addon-ssh version is 10.0.0 or later.
- Verify addon.stdin is no longer available after upgrade.
- Review Home Assistant add-on access permissions.
- Check administrative logs for unusual add-on interactions.
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-2021-45099 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/hassio-addons/addon-ssh/releases/tag/v10.0.0CVE reference · x_refsource_MISC
- https://gist.github.com/Eriner/0872628519f70556d2c26c83439a9f67CVE 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.