CVE-2019-0540

Excel Viewer vulnerability

CVSS

5.5

EPSS

12.8%

EPSS pct

96th

Exploited

No known

A security feature bypass vulnerability exists when Microsoft Office does not validate URLs.An attacker could send a victim a specially crafted file, which could trick the victim into entering credentials, aka 'Microsoft Office Security Feature Bypass Vulnerability'.

Affected vendor

Microsoft

Affected product

Excel Viewer

CVSS vector

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Weakness type (CWE)

CWE-601 — Open Redirect

Published

2019-03-05

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable with local access, low attack complexity, requiring no privileges, user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 12.8% reflects a moderate probability of exploitation activity in the wild over the next 30 days, placing it above 96% of all scored CVEs.

Check your external exposure to CVE-2019-0540

Confirm whether Microsoft Excel Viewer is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2019-0540.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-0540

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2019-0540 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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