Security readout for executives and security teams
Plain-English summary
CVE-2021-1733 is a high-severity elevation-of-privilege issue in Microsoft Sysinternals PsExec. It matters because PsExec is often used by administrators and automation, so a low-privileged local attacker on a system with vulnerable PsExec could potentially gain higher privileges. The provided sources do not show active exploitation.
Executive priority
Treat as high priority where PsExec is present on production, admin, or shared systems. This is not described as remotely exploitable from the internet, but it can increase business impact during an intrusion by helping a low-privileged attacker gain stronger control.
Technical view
The source bundle identifies Microsoft PsExec as affected and assigns CVSS 3.1 score 7.8: local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact. The temporal vector indicates proof-of-concept maturity and an official remediation, but the bundle does not include root-cause details or CWE mapping.
Likely exposure
Exposure is most likely in Windows environments where Sysinternals PsExec is installed or bundled into admin, helpdesk, automation, incident response, or remote management workflows. The affected version data is not operationally precise, so teams should inventory actual PsExec binaries and compare them with Microsoft guidance.
Exploitation context
The bundle does not cite CISA KEV listing or active exploitation. Risk is primarily local privilege escalation after an attacker already has low-privileged access. The CVSS temporal metric marks exploit maturity as proof-of-concept, but no exploit details are provided here.
Researcher notes
Evidence is limited to CVE metadata and the MSRC advisory reference. No CWE, root cause, or detailed affected version range is included in the bundle. Validation should focus on PsExec presence, Microsoft’s official remediation status, and local privilege boundary risk.
Mitigation direction
- Review Microsoft MSRC guidance for CVE-2021-1733.
- Update or replace PsExec where Microsoft identifies vulnerable builds.
- Restrict PsExec availability to approved admin systems only.
- Limit local administrator and interactive access on managed endpoints.
- Monitor for unauthorized PsExec use in endpoint telemetry.
Validation and detection
- Inventory PsExec binaries across endpoints, servers, and admin shares.
- Compare discovered versions or hashes against Microsoft guidance.
- Confirm vulnerable copies are updated, removed, or access-restricted.
- Review endpoint logs for unexpected PsExec execution.
- Verify only approved teams can run PsExec.
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.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-1733 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1733CVE 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.