CVE-2021-28831

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 ImpactpartialSuccessful exploitation gives limited 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

2.71% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 85.7% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

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

2021-03-19 04:01Z5 YR AGO

Last updated

2025-12-17 21:57Z10 MO AGO

Reserved

2021-03-19

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

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

Weaknesses

• CWE-755Improper Handling of Exceptional ConditionsClass
• CWE-763Release of Invalid Pointer or ReferenceBase

Data version

5.2

Document digest

fb8865d0bca73a68e1b6daa45b2373893d5ef1740aceeb676e369fb0c82916ed

• git.busybox.nethttps://git.busybox.net/busybox/commit/?id=f25d254dfd4243698c31a4f3153d4ac72aa9e9bdx_refsource_MISC
• lists.fedoraproject.orgFEDORA-2021-e82915eee1https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZASBW7QRRLY5V2R44MQ4QQM4CZIDHM2U/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-d20c8a4730https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z7ZIFKPRR32ZYA3WAA2NXFA3QHHOU6FJ/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2021-2024803354https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UDQGJRECXFS5EZVDH2OI45FMO436AC4/vendor-advisoryx_refsource_FEDORA
• lists.debian.org[debian-lts-announce] 20210401 [SECURITY] [DLA 2614-1] busybox security updatehttps://lists.debian.org/debian-lts-announce/2021/04/msg00001.htmlmailing-listx_refsource_MLIST
• security.gentoo.orgGLSA-202105-09https://security.gentoo.org/glsa/202105-09vendor-advisoryx_refsource_GENTOO
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20250509-0005/
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/01/msg00012.html