CVE-2023-35311

Microsoft Outlook: Security Feature Bypass

As of , CVE-2023-35311 in Microsoft Outlook is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 11 July 2023
US federal deadline
1 August 202321 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.16Higher than 96% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
No score that dayThe EPSS file of the day CISA listed it has no score for it.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
Vendor advice: msrc.microsoft.comLinks below, from CISA's entry.

What CISA says to do

Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.

CISA's required action

What the flaw is

Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt.

CISA's description

Microsoft Outlook Security Feature Bypass Vulnerability

The CVE record's description, from microsoft

CVE published
11 July 2023
Assigned by
microsoft
CVSS
8.8 High (CVSS 3.1, from the CNA)
CWE-367
Time-of-check Time-of-use (TOCTOU) Race Condition
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.

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