CVE-2021-23133

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

0.47% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 38.6% 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

Analyzed. NVD last modified this record on 2026-07-30.

Red Hat severity

Moderate. 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

2021-04-22 18:00Z5 YR AGO

Last updated

2024-09-16 19:04Z1 YR AGO

Reserved

2021-01-06

Assigning CNA

palo_alto

Record state

PUBLISHED

Severity

Medium (CVSS 6.7)

CNA CVSS vector

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

Weaknesses

• CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')Class

Data version

5.1

Document digest

0a3ed7e0c9c9bbc0a4eac4e5f889a889d401b42515478ce7fef846c4f68cff52

• www.openwall.comhttps://www.openwall.com/lists/oss-security/2021/04/18/2x_refsource_MISC
• git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b166a20b07382b8bc1dcee2a448715c9c2c81b5bx_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-8cd093f639https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PAEQ3H6HKNO6KUCGRZVYSFSAGEUX23JL/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-e6b4847979https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CUX2CA63453G34C6KYVBLJXJXEARZI2X/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-a963f04012https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XZASHZVCOFJ4VU2I3BN5W5EPHWJQ7QWX/vendor-advisoryx_refsource_FEDORA
• www.openwall.com[oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp socketshttp://www.openwall.com/lists/oss-security/2021/05/10/1mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp socketshttp://www.openwall.com/lists/oss-security/2021/05/10/2mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp socketshttp://www.openwall.com/lists/oss-security/2021/05/10/4mailing-listx_refsource_MLIST
• www.openwall.com[oss-security] 20210510 Re: CVE-2021-23133: Linux kernel: race condition in sctp socketshttp://www.openwall.com/lists/oss-security/2021/05/10/3mailing-listx_refsource_MLIST
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210611-0008/x_refsource_CONFIRM
• lists.debian.org[debian-lts-announce] 20210623 [SECURITY] [DLA 2689-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlmailing-listx_refsource_MLIST
• lists.debian.org[debian-lts-announce] 20210623 [SECURITY] [DLA 2690-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlmailing-listx_refsource_MLIST