CVE intelligence and bounded remediation

CVE-2023-35311 — Microsoft Outlook Security Feature Bypass Vulnerability

High CVSS 8.8 CISA KEV

Microsoft Outlook Security Feature Bypass Vulnerability

Severity
High
CVSS
8.8 (3.1)
Published
2023-07-11
CISA KEV
Known exploited
Ecosystem
windows/system
Weaknesses
CWE-367

Affected products

  • microsoft / 365_apps
  • microsoft / office / 2019
  • microsoft / office_long_term_servicing_channel / 2021
  • microsoft / outlook / 2013
  • microsoft / outlook / 2016

Showing 5 representative product identities from 6 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Race condition, TOCTOU, and lifecycle synchronization

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Check exposure

  • Map concurrent actors, shared state, lock boundaries, signals, callbacks, retries, and check-then-use sequences in the affected path.
  • Determine whether untrusted users can influence timing, object names, filesystem state, or repeated state transitions.
  • Identify clustered and multi-process behavior that repository-local tests may not represent.

Remediate safely

  • Make the sensitive state transition atomic or protect it with a consistently ordered synchronization primitive.
  • Perform authorization and invariant checks on the same authoritative object and transaction used for the operation.
  • Use unique private resources, safe ownership transfer, and idempotent operations; add deterministic concurrency regression tests.

Authoritative sources

Complete CVE record and remediation plan

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