CVE-2023-35311
Microsoft Outlook Security Feature Bypass Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 1 August 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
Microsoft Outlook Security Feature Bypass Vulnerability
- CVSS 3.1
- 8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 15.52% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 11 July 2023 · due 1 August 2023
- Weakness
- CWE-367
- Affected
- microsoft/365 apps · microsoft/office 2019 · microsoft/office 2021 · microsoft/outlook
- Source
- secure@microsoft.com
EPSS 15.5% since 30 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions or discontinue use of the product if updates are unavailable. https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311; https://nvd.nist.gov/vuln/detail/CVE-2023-35311
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311Patch, Vendor Advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-35311US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.