Security readout for executives and security teams
Plain-English summary
CVE-2021-1700 is a high-severity Microsoft Windows Remote Procedure Call Runtime flaw that could allow code execution. It affects many Windows client and server versions, including legacy systems. The business risk is highest where affected Windows hosts remain unpatched and reachable across networks.
Executive priority
High priority for remediation, especially in server and legacy Windows environments. The provided evidence does not confirm active exploitation, but the impact profile supports prompt patch compliance and exposure reduction.
Technical view
The source bundle describes a Remote Procedure Call Runtime remote code execution vulnerability with CVSS 3.1 score 8.8. The vector is network-accessible, low complexity, requires low privileges, needs no user interaction, and has high confidentiality, integrity, and availability impact. Scope is unchanged.
Likely exposure
Exposure is likely on unpatched affected Microsoft Windows clients and servers listed in the bundle, especially Windows Server 2008, 2016, 2019, and Windows 10 variants. The CVSS vector indicates an attacker needs network access and low privileges, not user interaction.
Exploitation context
The bundle does not show CISA KEV listing, and no provided source confirms active exploitation. CVSS marks exploit maturity as unproven. Do not treat this as confirmed exploited from the provided evidence, but do treat it as a serious patching issue.
Researcher notes
The bundle lacks root-cause detail, vulnerable RPC interface specifics, exploit mechanics, or KB identifiers. Validation should stay focused on affected Windows versions, patch state, and network exposure. Do not assume unauthenticated exploitation because the CVSS vector requires low privileges.
Mitigation direction
- Review the MSRC advisory for applicable updates and deployment guidance.
- Patch affected Windows versions according to Microsoft guidance.
- Prioritize internet-exposed, server, and legacy Windows systems.
- Reduce unnecessary network reachability to RPC services where operationally feasible.
- Track unsupported Windows versions for upgrade or isolation decisions.
Validation and detection
- Inventory Windows versions against the affected product list.
- Confirm security update status using enterprise patch tooling.
- Check whether affected systems expose RPC across untrusted network boundaries.
- Validate compensating network controls for legacy or delayed-patch systems.
- Document exceptions with owner, business reason, and remediation date.
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.
Execution 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-2021-1700 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/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:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Source materials
- CVE List V5 sourceCVE List V5
- Remote Procedure Call Runtime Remote Code Execution VulnerabilityCVE reference · vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-1700CVE reference · x_refsource_MISC, x_transferred
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.