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CVE-2021-42385

A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the evaluate function

Published: Nov 15, 2021Updated: Nov 3, 2025 Sources: CVE List NVD BDU csafCWE-416
NVD MITRE
7.2CVSSHIGH
EPSS Score
2.7%
Top 16.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Multiple vulnerabilities have been identified in the BIOS of the SIMATIC S7-1500 TM MFP before V1.3.0. Siemens has released a new version for SIMATIC S7-1500 TM MFP - BIOS and recommends to update to the latest version.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-416

Affected Products

busyboxbusybox
Embedded
Operating Systems / linux-distro
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
ОС ОН «Стрелец»АО «Концерн ВНИИНС»
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
busyboxoss-projectOperating Systemsaka busybox utilities
fedoraprojectoss-projectUSOperating Systemsaka fedora project
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ао «концерн вниинс»commercialRUOperating Systemsaka ao konsern vniins
ооо «ред софт»commercialRUOperating Systemsaka red soft
and 3 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://cert-portal.siemens.com/productcert/csaf/ssa-831302.json
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/html/ssa-831302.html
cert-portal.siemens.com
https://cert-portal.siemens.com/productcert/pdf/ssa-831302.pdf
cert-portal.siemens.com
and 23 more references View all →

Timeline

Published
Nov 15, 2021
Last Updated
Nov 3, 2025

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