Security readout for executives and security teams
Plain-English summary
CVE-2021-47826 is a local privilege escalation issue in Acer Backup Manager Module 3.0.0.99. A standard local user could potentially cause code to run with Windows LocalSystem privileges because a service executable path is not properly quoted. This is mainly a risk on endpoints where the affected Acer software is installed.
Executive priority
Prioritize remediation on shared workstations, kiosks, and endpoints where users lack administrative rights but can log in locally. This flaw can turn limited local access into full system control on affected machines.
Technical view
The NTI IScheduleSvc service in Acer Backup Manager Module 3.0.0.99 has a CWE-428 unquoted service path under C:\Program Files (x86)\NTI\Acer Backup Manager\. The CVSS v4.0 score is 8.5, with local attack vector, low complexity, low privileges required, and high impact to confidentiality, integrity, and availability on the vulnerable system.
Likely exposure
Exposure is limited to Windows systems with Acer Backup Manager Module 3.0.0.99 installed and the vulnerable NTI IScheduleSvc service present. The provided sources do not identify other affected versions or products.
Exploitation context
The CVE is not listed as KEV in the provided data. ExploitDB is cited as an exploit reference, indicating public exploit information exists, but the sources do not establish active exploitation in the wild.
Researcher notes
Evidence supports a local privilege escalation in one named version, 3.0.0.99. The bundle includes CVE, VulnCheck, and ExploitDB references, but no Acer security advisory or patch details. Treat scope and fix availability as incomplete until vendor guidance is confirmed.
Mitigation direction
- Inventory endpoints for Acer Backup Manager Module 3.0.0.99.
- Check Acer or software vendor guidance for updates or removal instructions.
- Remove the affected software where it is not business-required.
- If supported, correct the vulnerable service path configuration using approved endpoint management processes.
- Restrict local user write access to relevant application directories.
Validation and detection
- Confirm whether NTI IScheduleSvc exists on managed Windows endpoints.
- Verify the installed Acer Backup Manager Module version.
- Review the service executable path for unquoted paths containing spaces.
- Check directory permissions along the service path for unsafe local write access.
- Monitor for unexpected service changes or suspicious child processes from the service.
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.
CWE-428: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution 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-2021-47826 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
- High
- CVSS
- 8.5 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.5HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49889CVE reference · exploit
- Acer Official HomepageCVE reference · product
- VulnCheck Advisory: Acer Backup Manager Module 3.0.0.99 - 'IScheduleSvc.exe' Unquoted Service PathCVE reference · third-party-advisory
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.
Unquoted Search Path or Element
Unquoted Search Path or Element represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.