CVE-2023-23397Microsoft Outlook Elevation of Privilege Vulnerability
- 9.8CriticalCVSS base score
- 97.2%Exploitation in 30 daysEPSS · top 0.1% of all CVEs
- YesKnown exploitedin CISA's KEV since 14 Mar 2023
- YesPublic exploitsa reference or SSVC says so
Description
Microsoft Outlook Elevation of Privilege Vulnerability
Exploited in the wild
CISA lists this vulnerability in its Known Exploited Vulnerabilities catalog as Microsoft Office Outlook Privilege Escalation Vulnerability.
- Added
- 14 Mar 2023
- Fix due (US federal)
- 4 Apr 2023
- Used by ransomware
- Not known
Apply updates per vendor instructions.
ENISA's EU Vulnerability Database lists it as exploited, from CISA's KEV, since 14 Mar 2023.
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. CISA's SSVC rates its exploitation: it is being exploited.
Timeline
ID reserved
By microsoft
- 2 months later
· 2 months later
Published
Added to CISA KEV
Known exploited in the wild
- 3 years later
· 3 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C |
| NVDNVD · Analyzed | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 97.2% · top 0.1% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: active · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
Microsoft · Microsoft Office LTSC 2021
- affected 16.0.1 – < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Outlook 2016
- affected 16.0.0.0 – < 16.0.5387.1000
Microsoft · Microsoft 365 Apps for Enterprise
- affected 16.0.1 – < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Office 2019
- affected 19.0.0 – < https://aka.ms/OfficeSecurityReleases
Microsoft · Microsoft Outlook 2013 Service Pack 1
- affected 15.0.0.0 – < 15.0.5537.1000
References
References2
- Microsoft Outlook Elevation of Privilege Vulnerability (opens in a new tab)vendor-advisoryx_transferred
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-23397 (opens in a new tab)government-resource
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- CISA KEV catalog (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2023-27497 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2023-23397)Record last updated .