CVE-2021-38166

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.31% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 24.4% of scored records. A rank, not a probability.

NVD base score

7.8 (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:U/C:H/I:H/A:H

NVD analysis status

Analyzed. NVD last modified this record on 2026-10-08.

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

2021-08-07 17:50Z5 YR AGO

Last updated

2026-10-08 21:03Z20 DAYS AGO

Reserved

2021-08-07

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-190Integer Overflow or WraparoundBase
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

4fc1dde83be9b2d62096ebf367f437f6c59dbf61cfb6cdc6eaa5c1999cc18579

• lore.kernel.orghttps://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu%40gmail.com/x_refsource_MISC
• git.kernel.orghttps://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-b22606e88bhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GUVLBJKZMWA3E3YXSH4SZ7BOYGJP4GXP/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-f35f45a76fhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UL6CH5M5PRLMA3KPBX4LPUO6Z73GRISO/vendor-advisoryx_refsource_FEDORA
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210909-0001/x_refsource_CONFIRM
• www.debian.orgDSA-4978https://www.debian.org/security/2021/dsa-4978vendor-advisoryx_refsource_DEBIAN