CVE-2021-25631

denylist of executable filename extensions possible to bypass under windows

HIGH

8.8

CVSS Score

Published: May 3, 2021 at 11:10 AM UTC

Updated: June 17, 2026 at 03:42 AM UTC

2 products affected across 2 vendorsLibreofficeLibreOffice

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Severity

HIGH8.8

Exploit prediction

EPSS 5%

Description

In the LibreOffice 7-1 series in versions prior to 7.1.2, and in the 7-0 series in versions prior to 7.0.5, the denylist can be circumvented by manipulating the link so it doesn't match the denylist but results in ShellExecute attempting to launch an executable type.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Libreoffice · Libreoffice

95%

7.0.0 ≤ v < 7.0.57.1.0 ≤ v < 7.1.2

Affected range stops below 7.0.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement

LibreOffice · Document

60%

7.0 ≤ v < 7.0.57.1 ≤ v < 7.1.27.0 7.1

Affected range stops below 7.0.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.1.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://www.libreoffice.org/about-us/security/advisories/cve-2021-25631/

References (2)

x_refsource_MISCExploitThird Party Advisory

Source: [email protected]

https://positive.security/blog/url-open-rce#open-libreoffice

x_refsource_MISCVendor Advisory

Source: [email protected]

https://www.libreoffice.org/about-us/security/advisories/cve-2021-25631/

CVSS

8.8HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-184NVD-CWE-Other

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