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CVE-2021-42377

CRITICALCVSS 9.8/10EPSS 3.38%

Last modified

CVE-2021-42377 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.38% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
3.38%

87.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
BusyboxBusybox1.33.0
BusyboxBusybox1.33.1
FedoraprojectFedora33
FedoraprojectFedora34
NetappCloud BackupAll versions
NetappHci Management NodeAll versions
NetappSolidfireAll versions
NetappH300s FirmwareAll versions
NetappH500s FirmwareAll versions
NetappH700s FirmwareAll versions
NetappH300e FirmwareAll versions
NetappH500e FirmwareAll versions
NetappH700e FirmwareAll versions
NetappH410s FirmwareAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-42377?
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.
How severe is CVE-2021-42377?
CVE-2021-42377 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.38% probability of exploitation in the next 30 days.
How do I fix CVE-2021-42377?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-42377?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST