CVE-2021-42377
9.8
CRITICAL · CVSS 3.1 · EPSS 3.6% (pctl 89)
In your normal cycle
Critical by CVSS (9.8), but no sign of active exploitation.
Description
An attacker-controlled pointer free in Busybox's hush applet leads to denial of service and possible code execution when processing a crafted shell command, due to the shell mishandling the &&& string. This may be used for remote code execution under rare conditions of filtered command input.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 3.62% — more likely to be exploited than 89% of all CVEs |
| Weakness | CWE-590 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2021-11-15 |
| Last modified | 2026-06-17 |
Affected (19)
| Vendor | Product |
|---|---|
| busybox | busybox |
| fedoraproject | fedora |
| netapp | cloud backup |
| netapp | h300e |
| netapp | h300e firmware |
| netapp | h300s |
| netapp | h300s firmware |
| netapp | h410s |
| netapp | h410s firmware |
| netapp | h500e |
| netapp | h500e firmware |
| netapp | h500s |
| netapp | h500s firmware |
| netapp | h700e |
| netapp | h700e firmware |
| netapp | h700s |
| netapp | h700s firmware |
| netapp | hci management node |
| netapp | solidfire |
References
- https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
- https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
- https://security.netapp.com/advisory/ntap-20211223-0002/
- https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
- https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
- https://security.netapp.com/advisory/ntap-20211223-0002/
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