CVE-2023-23397 (GCVE-0-2023-23397)
Vulnerability from cvelistv5 – Published: 2023-03-14 16:55 – Updated: 2025-10-21 23:15Title
Microsoft Outlook Elevation of Privilege Vulnerability
Summary
Microsoft Outlook Elevation of Privilege Vulnerability
Severity
9.8 (Critical)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-20 - Improper Input Validation
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisory |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
5 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft Office LTSC 2021 |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Outlook 2016 |
Affected:
16.0.0.0 , < 16.0.5387.1000
(custom)
|
|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Office 2019 |
Affected:
19.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
|
| Microsoft | Microsoft Outlook 2013 Service Pack 1 |
Affected:
15.0.0.0 , < 15.0.5537.1000
(custom)
|
Date Public
2023-03-14 07:00
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cc16449c-9d00-4401-b0af-4bfaf155e5cb
Exploited: Yes
Timestamps
First Seen: 2023-03-14
Asserted: 2023-03-14
Scope
Notes: KEV entry: Microsoft Office Outlook Privilege Escalation Vulnerability | Affected: Microsoft / Office | Description: Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user. | Required action: Apply updates per vendor instructions. | Due date: 2023-04-04 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-23397, https://msrc.microsoft.com/blog/2023/03/microsoft-mitigates-outlook-elevation-of-privilege-vulnerability/, ; https://nvd.nist.gov/vuln/detail/CVE-2023-23397
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-294 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Office |
| Due Date | 2023-04-04 |
| Date Added | 2023-03-14 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Office Outlook Privilege Escalation Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:27 UTC
| Updated: 2026-02-06 07:17 UTC
KEVintel KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 5f030014-4694-4d47-98a4-cf4c589db0e4
Exploited: Yes
Timestamps
First Seen: 2023-03-14
Asserted: 2023-03-14
Scope
Notes: KEVIntel entry: Microsoft Outlook Elevation of Privilege Vulnerability | Affected: Microsoft / Microsoft Office LTSC 2021, Microsoft Outlook 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Outlook 2013 Service Pack 1 | CVSS: 9.8 (CRITICAL) | EPSS: 0.97408 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | Microsoft Outlook Elevation of Privilege Vulnerability |
| Vendor | Microsoft |
| Product | Microsoft Office LTSC 2021, Microsoft Outlook 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 2019, Microsoft Outlook 2013 Service Pack 1 |
| Added Date | 2023-03-14T00:00:00.000Z |
| Cvss Score | 9.8 |
| Epss Score | 0.97408 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.9989 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-19 12:46 UTC
| Updated: 2026-06-19 12:46 UTC
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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