Security readout for executives and security teams
Plain-English summary
CVE-2023-35300 is a high-severity Windows Remote Procedure Call Runtime flaw. A low-privileged attacker on the network could potentially run code on affected Windows clients or servers without user interaction. Treat it as important patching work, especially for servers and legacy Windows systems, but the supplied sources do not show active exploitation.
Executive priority
High. Schedule prompt remediation through standard security update processes. Escalate priority for critical servers, legacy Windows, and environments with broad internal network access. Supplied evidence does not support calling this an active-exploitation emergency.
Technical view
Microsoft describes this as an RPC Runtime remote code execution vulnerability with CWE-416 use-after-free. CVSS 3.1 is 8.8: network attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact. Scope is unchanged.
Likely exposure
Exposure is limited to listed Microsoft Windows versions, including Windows 10, Windows 11, Windows Server 2008 through 2022, and Server Core variants. Systems reachable over networks where low-privileged users or compromised accounts exist are higher priority.
Exploitation context
The bundle marks KEV as false and gives exploit maturity as unproven. Do not assume active exploitation from these sources. The risk is still material because RPC is broadly present in Windows environments and the impact is full system compromise if exploited.
Researcher notes
Key constraints are PR:L and AV:N: an attacker needs some low-privileged access but no user interaction. The underlying class is use-after-free in Windows RPC Runtime. The supplied sources do not include proof-of-concept details, exploit telemetry, or specific KB mappings.
Mitigation direction
- Apply the Microsoft security update for CVE-2023-35300 where applicable.
- Prioritize internet-adjacent, server, domain-controller-adjacent, and legacy Windows assets.
- Check Microsoft Update Guide for product-specific update details and support status.
- Reduce unnecessary RPC exposure across network boundaries where operationally possible.
- Retire or isolate unsupported Windows versions if updates are unavailable.
Validation and detection
- Inventory Windows assets against the affected version list in the source bundle.
- Confirm each affected host has the relevant Microsoft update installed.
- Review vulnerability scanner findings for CVE-2023-35300 and reconcile exceptions.
- Verify legacy Server 2008 and Server 2012 systems have valid update paths.
- Confirm RPC is not unnecessarily reachable from untrusted network segments.
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.
CWE-416: 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-2023-35300 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
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.