CVE-2021-21381

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.54% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 74.4% of scored records. A rank, not a probability.

NVD base score

8.2 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-03-11 00:00Z5 YR AGO

Last updated

2024-08-03 18:09Z2 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

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

Weaknesses

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
• CWE-284Improper Access ControlPillar

Data version

5.1

Document digest

8260b8679ad349bda9faffbeebbc7fa36ade99dafc0edde94261797334d31b03

• github.comhttps://github.com/flatpak/flatpak/security/advisories/GHSA-xgh4-387p-hqpp
• github.comhttps://github.com/flatpak/flatpak/pull/4156
• github.comhttps://github.com/flatpak/flatpak/commit/8279c5818425b6812523e3805bbe242fb6a5d961
• github.comhttps://github.com/flatpak/flatpak/commit/a7401e638bf0c03102039e216ab1081922f140ae
• github.comhttps://github.com/flatpak/flatpak/commit/eb7946bb6248923d8c90fe9b84425fef97ae580d
• github.comhttps://github.com/flatpak/flatpak/releases/tag/1.10.2
• www.debian.orgDSA-4868https://www.debian.org/security/2021/dsa-4868vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-26ad138ffahttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WXNVFOIB6ZP4DGOVKAM25T6OIEP3YLGV/vendor-advisory
• lists.fedoraproject.orgFEDORA-2021-fe7decc595https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MXXLXC2DPJ45HSMTI5MZYHMYEGQN6AA/vendor-advisory
• security.gentoo.orgGLSA-202312-12https://security.gentoo.org/glsa/202312-12vendor-advisory