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» CVE-2023-35311
Microsoft Outlook Security Feature Bypass Vulnerability
NVD Status： Analyzed ，CVE State: published
Threat Intelligence & Risk Assessment for CVE-2023-35311
Conclusion & alert: CVE-2023-35311 is rated Active Exploitation (79.1/100) : CVSS High severity, with medium exploitation likelihood (EPSS 0.47%).Core evidence: CISA KEV confirms active exploitation (added 2023-07-11) affecting Microsoft / Outlook. a weakness (CWE-367) Unauthenticated remote administrative access may be possible.Mandatory action: The CISA remediation deadline has passed—treat as an emergency patch priority.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
CISA KEV Record for CVE-2023-35311
Name : Microsoft Outlook Security Feature Bypass Vulnerability · CISA KEV detail
Exploit added : 2023-07-11
Action due : 2023-08-01
Required action : Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
Exploit prediction scoring system (EPSS) score for CVE-2023-35311
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
#
Date
Old EPSS score
New EPSS score
Delta (New - Old)
1
2025-11-21
4.00%
0.47%
-3.53%
2
2025-11-18
0.47%
4.00%
+3.53%
3
2025-10-29
—
0.47%
—
Full EPSS history
(31 records total)
Common vulnerability scoring system (CVSS) metrics for CVE-2023-35311
CVSS metrics for this CVE.
Base score
Version
Severity
Vector
Exploitability
Impact
Score source
8.8
3.1
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
2.8
5.9
[email protected]
7.5
3.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
1.6
5.9
[email protected]
7.5
3.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
1.6
5.9
134c704f-9b21-4f2e-91b3-4a467353bcc0
Weakness enumeration for CVE-2023-35311
Affected software / configurations for CVE-2023-35311
References for CVE-2023-35311
cvelogic
Threat Intelligence