Outlook
Summary iPlain-English security verdict for Outlook, generated from its current health score, actively-exploited vulnerabilities, and latest supported version.
Outlook currently scores 20/100 — critical, with active exploitation. 5 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2023-23397. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
Disclosure trend iNew CVEs published for Outlook each year (NVD). A higher bar means more disclosures that year — more scrutiny, not necessarily less safe.
Patch priority — what to act on iThe issues to fix first — actively exploited (CISA KEV) first, then by exploitation probability (EPSS), then severity. Each row's "→ fixed in" is the earliest version that patches it; "see advisory" means no fixed version is published.
Most urgent first — actively exploited, then likeliest to be exploited.
CVE-2023-23397 CRITICAL exploited Improper input validation EPSS 97% → see advisory CVE-2015-1641 HIGH exploited Out-of-bounds write EPSS 97% → see advisory CVE-2017-11774 HIGH exploited Memory corruption EPSS 60% → see advisory CVE-2007-0671 HIGH exploited EPSS 42% → see advisory CVE-2023-35311 HIGH exploited CWE-367 EPSS 15% → see advisory CVE-2004-0204 HIGH EPSS 73% → see advisory CVE-2006-4868 HIGH Memory corruption EPSS 59% → see advisory CVE-2010-0266 HIGH Code injection EPSS 54% → see advisory CVE-2001-0538 HIGH EPSS 53% → see advisory CVE-2004-0200 HIGH EPSS 49% → see advisory CVE-2004-0121 HIGH CWE-88 EPSS 48% → see advisory CVE-2006-0002 HIGH EPSS 46% → see advisoryGet alerted about Outlook
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Frequently asked
Is Outlook safe and patched?
Outlook currently scores 20/100 — critical, with active exploitation. 5 of its known vulnerabilities are being actively exploited in the wild (CISA KEV), including CVE-2023-23397. Upgrade immediately and review your exposure to the actively-exploited CVEs below.
What should I do about Outlook now?
Review the patch-priority list, apply the available fixes (or move to the latest release), and confirm against Microsoft's official advisory. Some issues are under active exploitation, so treat this as urgent.
Why is Outlook listed on IsItPatched?
Outlook was added automatically because CISA's Known Exploited Vulnerabilities (KEV) catalog flagged it as actively exploited in the wild. IsItPatched tracks its known CVEs, severity (CVSS), exploitation probability (EPSS) and KEV status from public data; its version and lifecycle mapping is verified over time.
lifecycle unknown — needs latest supported version
Informational only, from public data (NVD · CISA KEV · EPSS · endoflife.date), and can lag or miss vendor-specific fixes. Always confirm against Microsoft's official advisory before you patch or upgrade.