CVE-2021-21261

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

0.57% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 44.9% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-01-14 19:40Z5 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 7.3)

CNA CVSS vector

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

Weaknesses

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
• CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')Class

Data version

5.1

Document digest

4c1a125600a9cffbaada59d3d04662a84fa3b0fec7528825546efe25c15a6903

• github.comhttps://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2x_refsource_CONFIRM
• github.comhttps://github.com/flatpak/flatpak/releases/tag/1.8.5x_refsource_MISC
• www.debian.orgDSA-4830https://www.debian.org/security/2021/dsa-4830vendor-advisoryx_refsource_DEBIAN
• github.comhttps://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486x_refsource_MISC
• github.comhttps://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8bx_refsource_MISC
• github.comhttps://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4x_refsource_MISC
• github.comhttps://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eabax_refsource_MISC
• security.gentoo.orgGLSA-202101-21https://security.gentoo.org/glsa/202101-21vendor-advisoryx_refsource_GENTOO