How severe is CVE-2021-28927?

CVE-2021-28927 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-28927 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-28927?

CVE-2021-28927 affects Libretro Retroarch. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-28927?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-28927 published?

CVE-2021-28927 was published on 2021-04-07 and last updated on 2026-07-09.

CVE-2021-28927

CVE-2021-28927 is a high-severity vulnerability in Libretro Retroarch with a CVSS 3.x base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 4.6
EPSS exploit prediction: 2% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-78
Affected product: Libretro Retroarch
Published: 2021-04-07
Last modified: 2026-07-09

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.

Frequently asked questions

What is CVE-2021-28927?: 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.
How severe is CVE-2021-28927?: CVE-2021-28927 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-28927 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-28927?: CVE-2021-28927 affects Libretro Retroarch. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-28927?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-28927 published?: CVE-2021-28927 was published on 2021-04-07 and last updated on 2026-07-09.

References

Affected products (1)

cpe:2.3:a:libretro:retroarch:*:*:*:*:*:*:*:*

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