Security readout for executives and security teams
Plain-English summary
MobaXterm versions before 21.0 can be made to hang when connected to a remote server that rapidly changes the tab title. This is a client-side denial of service, not a documented data theft or code execution issue. The main business risk is disruption to administrators using vulnerable Windows clients.
Executive priority
Treat this as a targeted operational disruption risk for administrative users, not a breach-class vulnerability based on current evidence. Patch during normal endpoint maintenance, with faster handling for teams using MobaXterm to manage critical infrastructure or untrusted systems.
Technical view
The CVE describes repeated high-speed tab title change requests causing many SetWindowTextA or SetWindowTextW calls, resulting in a Windows GUI hang. The affected product is MobaXterm before 21.0. The source bundle provides no CVSS vector, CWE, proof of exploitation, or detailed vendor mitigation beyond the version boundary.
Likely exposure
Exposure is likely limited to Windows endpoints running MobaXterm before 21.0, especially where users connect to untrusted, compromised, or externally managed remote servers. Organizations without MobaXterm or already on 21.0 or later are not indicated as affected by the provided sources.
Exploitation context
The CVE states a remote server can cause the GUI hang through repeated tab title updates. CISA KEV status is false in the source bundle, and no cited source supports active exploitation. Evidence is insufficient to claim real-world exploitation or broader impact.
Researcher notes
The public record is sparse: no CVSS, CWE, affected CPEs, exploit status, or detailed changelog text is included in the source bundle. Analysis should stay bounded to MobaXterm before 21.0 and the documented GUI denial-of-service behavior.
Mitigation direction
- Upgrade MobaXterm installations older than 21.0 to version 21.0 or later.
- Prioritize administrator workstations and users connecting to third-party or untrusted servers.
- If upgrade is delayed, avoid connecting vulnerable clients to untrusted remote servers.
- Monitor vendor guidance for any additional remediation details.
Validation and detection
- Inventory endpoints for installed MobaXterm versions.
- Confirm whether any installations are earlier than 21.0.
- Check support tickets or endpoint telemetry for repeated MobaXterm GUI hangs.
- Verify upgraded clients report version 21.0 or later.
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-2021-28847 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://mobaxterm.mobatek.net/preview.htmlCVE reference · x_refsource_MISC
- https://mobaxterm.mobatek.net/download-home-edition.htmlCVE reference · x_refsource_CONFIRM
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.