CVE-2021-1732

Microsoft Win32k: Privilege Escalation

As of , CVE-2021-1732 in Microsoft Win32k is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch this week.

Exploited
Yes: CISA listed it on 3 November 2021
US federal deadline
17 November 202114 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Known
EPSS score
0.78Higher than 99% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
Not availableCISA listed it before 4 February 2022, where the EPSS files we read begin.
Public exploit
1 Metasploit module
Fix
No vendor link in CISA's entry

What CISA says to do

Apply updates per vendor instructions.

CISA's required action

What the flaw is

Microsoft Win32k contains an unspecified vulnerability that allows for privilege escalation.

CISA's description

Windows Win32k Elevation of Privilege Vulnerability

The CVE record's description, from microsoft

CVE published
25 February 2021
Assigned by
microsoft
CVSS
7.8 High (CVSS 3.1, from the CNA)
CWE-787
Out-of-bounds Write
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.

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

  • Metasploit: Win32k ConsoleControl Offset Confusionexploit module, rank average

Win32k: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2014-4113Privilege EscalationMicrosoft Win32kPatch this weekMetasploit module; EPSS 0.87; verified Exploit-DB entry0.87
CVE-2018-8120Privilege EscalationMicrosoft Win32kPatch this weekRansomware use; Metasploit module; EPSS 0.73; verified Exploit-DB entry0.73
CVE-2015-1701Privilege EscalationMicrosoft Win32kPatch this weekRansomware use; Metasploit module; EPSS 0.56; verified Exploit-DB entry0.56
CVE-2018-8453Privilege EscalationMicrosoft Win32kPatch this weekRansomware use; Metasploit module; EPSS 0.70; verified Exploit-DB entry0.70
CVE-2013-3660Privilege EscalationMicrosoft Win32kPatch this weekMetasploit module; verified Exploit-DB entry0.39
CVE-2022-21882Privilege EscalationMicrosoft Win32kPatch this weekRansomware use; Metasploit module; EPSS 0.590.59
CVE-2019-1458Privilege EscalationMicrosoft Win32kPatch this weekRansomware use; Metasploit module; EPSS 0.740.74
CVE-2019-0808Privilege EscalationMicrosoft Win32kPatch this weekMetasploit module; EPSS 0.530.53
CVE-2020-1054Privilege EscalationMicrosoft Win32kPatch this weekMetasploit module; EPSS 0.540.54
CVE-2016-7255Privilege EscalationMicrosoft Win32kPatch this weekRansomware use; EPSS 0.810.81

All 25 entries for Win32k

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