CVE-2021-28927

Name: CVE-2021-28927
Creator: NVD / NIST
Published: 2021-04-07T15:15:13.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.50%

Last modified Jun 17, 2026

CVE-2021-28927 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. The text-to-speech engine in libretro RetroArch for Windows 1.9.0 passes unsanitized input to PowerShell through platform_win32.c via the accessibility_speak_windows function, which allows attackers who have write access on filesystems that are used by RetroArch to execute code via command injection using specially a crafted file and directory names.. EPSS estimates a 1.50% chance of exploitation in the next 30 days.

Description

The text-to-speech engine in libretro RetroArch for Windows 1.9.0 passes unsanitized input to PowerShell through platform_win32.c via the accessibility_speak_windows function, which allows attackers who have write access on filesystems that are used by RetroArch to execute code via command injection using specially a crafted file and directory names.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.50%

71.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-78

Affected Software

Vendor	Product	Versions
Libretro	Retroarch	>= 1.9.0, <= 1.9.4

References

http://libretro.comExploit, Vendor Advisory
http://retroarch.comProduct, Vendor Advisory
https://github.com/libretro/RetroArch/blob/d3dc3ee989ec6a4903c689907ffc47027f71f776/frontend/drivers/platform_win32.cPatch, Third Party Advisory
https://labs.bishopfox.com/advisories/retroarch-for-windows-version-1.9.0Exploit, Third Party Advisory
http://libretro.comExploit, Vendor Advisory
http://retroarch.comProduct, Vendor Advisory
https://github.com/libretro/RetroArch/blob/d3dc3ee989ec6a4903c689907ffc47027f71f776/frontend/drivers/platform_win32.cPatch, Third Party Advisory
https://labs.bishopfox.com/advisories/retroarch-for-windows-version-1.9.0Exploit, Third Party Advisory

Timeline

Published: Apr 7, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28927?

How severe is CVE-2021-28927?

CVE-2021-28927 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28927?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28927?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST