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CVE-2021-42375

MEDIUM
5.5
CVSS Score
Published: November 15, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 04:09 AM UTC
19 products affected across 3 vendorsFedoraCloud BackupH700S Firmware

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Severity
MEDIUM5.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

An incorrect handling of a special element in Busybox's ash applet leads to denial of service when processing a crafted shell command, due to the shell mistaking specific characters for reserved characters. This may be used for DoS under rare conditions of filtered command input.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

BusyBox· Busybox
95%
v < 1.34.01.33.1
Affected range stops below 1.34.0, so it looks safe — our inference, not a vendor statement
Fedora· Fedora Projectrpm
95%
3334
Cloud Backup· NetAppdrupal
95%
All versions
H300E Firmware· NetAppdrupal
95%
All versions
netapp-h300e (same device)
H300S Firmware· NetAppdrupal
95%
All versions
netapp-h300s (same device)
H410S Firmware· NetAppdrupal
95%
All versions
netapp-h410s (same device)
H500E Firmware· NetAppdrupal
95%
All versions
netapp-h500e (same device)
H500S Firmware· NetAppdrupal
95%
All versions
netapp-h500s (same device)
H700E Firmware· NetAppdrupal
95%
All versions
netapp-h700e (same device)
H700S Firmware· NetAppdrupal
95%
All versions
netapp-h700s (same device)

References (5)

Source: [email protected]
https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog
Third Party Advisory
Source: [email protected]
https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/
Vendor Advisory
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/
Third Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20211223-0002/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.5MEDIUMCISA-ADP
Attack Vector
LOCAL
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-159NVD-CWE-Other

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