CVE-2023-35311 (GCVE-0-2023-35311)
Vulnerability from cvelistv5 – Published: 2023-07-11 17:03 – Updated: 2025-10-21 23:05Title
Microsoft Outlook Security Feature Bypass Vulnerability
Summary
Microsoft Outlook Security Feature Bypass Vulnerability
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-04 17:53 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
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
6 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
guessed | |
| Microsoft | Microsoft Office LTSC 2021 |
Affected:
16.0.1 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
guessed | |
| Microsoft | Microsoft Office 2019 |
Affected:
19.0.0 , < https://aka.ms/OfficeSecurityReleases
(custom)
|
guessed | |
| Microsoft | Microsoft Outlook 2016 |
Affected:
16.0.0.0 , < 16.0.5404.1000
(custom)
|
guessed | |
| Microsoft | Microsoft Outlook 2013 |
Affected:
14.0.0 , < 15.0.5571.1000
(custom)
|
guessed | |
| Microsoft | Microsoft Outlook 2013 Service Pack 1 |
Affected:
15.0.0.0 , < 15.0.5571.1000
(custom)
|
guessed |
Date Public
2023-07-11 07:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f56611e9-2960-4084-a7c1-249e89de3dbd
Exploited: Yes
Timestamps
First Seen: 2023-07-11
Asserted: 2023-07-11
Scope
Notes: KEV entry: Microsoft Outlook Security Feature Bypass Vulnerability | Affected: Microsoft / Outlook | Description: Microsoft Outlook contains a security feature bypass vulnerability that allows an attacker to bypass the Microsoft Outlook Security Notice prompt. | Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable. | Due date: 2023-08-01 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-35311; https://nvd.nist.gov/vuln/detail/CVE-2023-35311
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-367 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Outlook |
| Due Date | 2023-08-01 |
| Date Added | 2023-07-11 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Outlook Security Feature Bypass Vulnerability |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 12:26 UTC
| Updated: 2026-02-06 07:17 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 330812e3-4bed-46d7-9490-a7128051521d
Exploited: Yes
Timestamps
First Seen: 2023-07-11
Asserted: 2023-07-11
Scope
Notes: KEVIntel entry: Microsoft Outlook Security Feature Bypass Vulnerability | Affected: Microsoft / Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office 2019, Microsoft Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2013 Service Pack 1 | CVSS: 8.8 (HIGH) | 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 Security Feature Bypass Vulnerability |
| Vendor | Microsoft |
| Product | Microsoft 365 Apps for Enterprise, Microsoft Office LTSC 2021, Microsoft Office 2019, Microsoft Outlook 2016, Microsoft Outlook 2013, Microsoft Outlook 2013 Service Pack 1 |
| Added Date | 2023-07-11T00:00:00.000Z |
| Cvss Score | 8.8 |
| Epss Score | None |
| Cvss Severity | HIGH |
| Epss Percentile | None |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 14:05 UTC
| Updated: 2026-07-10 06:14 UTC
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"redhat_vex": {
"current_release_date": "2026-03-27T11:30:58+00:00",
"cve": "CVE-2023-35311",
"id": "CVE-2023-35311",
"initial_release_date": "2023-07-11T07:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "Microsoft Outlook Security Feature Bypass Vulnerability",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-35311.json",
"version": "3"
},
"vulnrichment": {
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\"custom\"}], \"platforms\": [\"ARM64-based Systems\"]}], \"datePublic\": \"2023-07-11T07:00:00.000Z\", \"references\": [{\"url\": \"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-35311\", \"name\": \"Microsoft Outlook Security Feature Bypass Vulnerability\", \"tags\": [\"vendor-advisory\"]}], \"descriptions\": [{\"lang\": \"en-US\", \"value\": \"Microsoft Outlook Security Feature Bypass Vulnerability\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en-US\", \"type\": \"CWE\", \"cweId\": \"CWE-367\", \"description\": \"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:microsoft:365_apps:*:*:*:*:enterprise:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"https://aka.ms/OfficeSecurityReleases\", \"versionStartIncluding\": \"16.0.1\"}, {\"criteria\": \"cpe:2.3:a:microsoft:office_long_term_servicing_channel:*:*:*:*:*:*:*:*\", \"vulnerable\": 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"cveMetadata": "{\"cveId\": \"CVE-2023-35311\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-21T23:05:43.274Z\", \"dateReserved\": \"2023-06-14T23:09:47.613Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2023-07-11T17:03:27.227Z\", \"assignerShortName\": \"microsoft\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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