CVE-2023-23397
Microsoft Office: Outlook Privilege Escalation
As of , CVE-2023-23397 in Microsoft Office 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 14 March 2023
- US federal deadline
- 4 April 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
- 0.97Higher than 99% 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.
CISA's required action
What the flaw is
Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user.
CISA's description
Microsoft Outlook Elevation of Privilege Vulnerability
The CVE record's description, from microsoft
- CVE published
- 14 March 2023
- Assigned by
- microsoft
- CVSS
- 9.8 Critical (CVSS 3.1, from the CNA)
- CWE-20
- Improper Input Validation
- CWE-294
- Authentication Bypass by Capture-replay
- CISA SSVC, exploitation
- active
- CISA SSVC, automatable
- no
- CISA SSVC, technical impact
- total
Timeline
- The CVE record was published.
- CISA added it to its list of exploited vulnerabilities.
- The US federal deadline to fix it.
Office: other exploited entries
| Vulnerability | Product | Our group | Listed | Deadline | EPSS |
|---|---|---|---|---|---|
| CVE-2010-3333Stack-based Buffer Overflow | Microsoft Office | Patch this weekMetasploit module; EPSS 0.89; verified Exploit-DB entry | 0.89 | ||
| CVE-2016-3235OLE DLL Side Loading | Microsoft Office | Patch this weekMetasploit module; verified Exploit-DB entry | 0.43 | ||
| CVE-2017-11882Memory Corruption | Microsoft Office | Patch this weekRansomware use; Metasploit module; EPSS 0.99 | 0.99 | ||
| CVE-2026-21509Security Feature Bypass | Microsoft Office | Patch this weekEPSS 0.71 | 0.71 | ||
| CVE-2009-0556PowerPoint Code Injection | Microsoft Office | Patch this weekEPSS 0.67 | 0.67 | ||
| CVE-2009-0563Buffer Overflow | Microsoft Office | Patch this weekEPSS 0.63 | 0.63 | ||
| CVE-2013-1331Buffer Overflow | Microsoft Office | Patch this weekEPSS 0.80 | 0.80 | ||
| CVE-2012-1856MSCOMCTL.OCX Remote Code Execution | Microsoft Office | Patch this weekEPSS 0.72 | 0.72 | ||
| CVE-2015-2545Malformed EPS File | Microsoft Office | Patch this weekEPSS 0.86 | 0.86 | ||
| CVE-2016-7193Memory Corruption | Microsoft Office | Patch this weekEPSS 0.58 | 0.58 |
Read further
- CVE recordcve.org
- NVD entrynvd.nist.gov
- CISA's catalogcisa.gov
- EPSS for this CVEapi.first.org