CVE-2021-21261 describes a sandbox escape vulnerability in Flatpak versions 0.11.4 through 1.8.4 and 1.9.x, affecting the flatpak-portal service. A malicious or compromised Flatpak application can leverage this flaw to execute arbitrary code on the host system by manipulating environment variables passed to non-sandboxed processes. This vulnerability carries a high CVSS score of 8.8, indicating a local attack vector with low complexity, allowing for high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation, public exploit code, or significant community discussion, the vulnerability is patched in Flatpak versions 1.8.5 and 1.10.0.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 0.11.4, < 1.8.5CPE matchmatch criteria | cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:* | ||
>= 1.9.1, < 1.10.0CPE matchmatch criteria | cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:* | ||
10.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
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