CVE-2021-26910

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

0.44% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 36.8% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

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

2021-02-08 19:56Z5 YR AGO

Last updated

2024-08-03 20:33Z2 YR AGO

Reserved

2021-02-08

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

• CWE-367Time-of-check Time-of-use (TOCTOU) Race ConditionBase

Data version

5.1

Document digest

b58b4c0e598cd3a0708cdc8d6b4c508c59098a22cd602b8088451192844fca6e

• github.comhttps://github.com/netblue30/firejail/commit/97d8a03cad19501f017587cc4e47d8418273834bx_refsource_MISC
• unparalleled.euhttps://unparalleled.eu/publications/2021/advisory-unpar-2021-0.txtx_refsource_MISC
• unparalleled.euhttps://unparalleled.eu/blog/2021/20210208-rigged-race-against-firejail-for-local-root/x_refsource_MISC
• github.comhttps://github.com/netblue30/firejail/releases/tag/0.9.64.4x_refsource_MISC
• www.openwall.com[oss-security] 20210209 Re: [cve-pending] Firejail: root privilege escalation in OverlayFS codehttp://www.openwall.com/lists/oss-security/2021/02/09/1mailing-listx_refsource_MLIST
• www.debian.orgDSA-4849https://www.debian.org/security/2021/dsa-4849vendor-advisoryx_refsource_DEBIAN
• lists.debian.org[debian-lts-announce] 20210211 [SECURITY] [DLA 2554-1] firejail security updatehttps://lists.debian.org/debian-lts-announce/2021/02/msg00015.htmlmailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202105-19https://security.gentoo.org/glsa/202105-19vendor-advisoryx_refsource_GENTOO