CVE-2021-22555 Report - Details, Severity, & Advisories
Twingate Team
•
Jul 4, 2024
What is CVE-2021-22555?
CVE-2021-22555 is a high-severity vulnerability affecting Linux-based systems since version 2.6.19-rc1. This heap out-of-bounds write vulnerability in the net/netfilter/x_tables.c component of the Linux kernel allows an attacker to gain privileges or cause a Denial of Service (DoS) through user namespace. It is crucial for organizations to address this issue to protect their infrastructure.
Who is impacted by this?
CVE-2021-22555 affects users running Linux kernel versions from 2.6.19-rc1 to 5.12, including various software like Brocade Fabric Operating System, NetApp FAS 8300 Firmware, and NetApp AFF A400 Firmware. This vulnerability can allow an attacker to gain privileges or cause a denial of service, putting a wide range of Linux-based systems at risk.
What to do if CVE-2021-22555 affected you
If you're affected by the CVE-2021-22555 vulnerability, it's important to take action to protect your system. To do this, follow these steps:
Update your Linux kernel to the latest version containing the patch for this vulnerability.
Limit access to the affected system and restrict user privileges to reduce potential impact.
Monitor your system for signs of compromise or unusual activity.
Follow best practices for system hardening and user access control.
Is this in CISA’s Known Exploited Vulnerabilities Catalog?
CVE-2021-22555 is not listed in CISA's Known Exploited Vulnerabilities Catalog. This vulnerability, known as Linux Kernel Netfilter Heap Out-Of-Bounds Write, was added to relevant sources on July 16, 2021. There is no specified due date or required action mentioned in the sources.
Weakness Enumeration
The weakness enumeration for this vulnerability is categorized as CWE-787, an out-of-bounds write issue affecting the Linux kernel's netfilter subsystem.
Learn More
For comprehensive information on this vulnerability, consult the NVD page and the sources listed below.
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CVE-2021-22555 Report - Details, Severity, & Advisories
Twingate Team
•
Jul 4, 2024
What is CVE-2021-22555?
CVE-2021-22555 is a high-severity vulnerability affecting Linux-based systems since version 2.6.19-rc1. This heap out-of-bounds write vulnerability in the net/netfilter/x_tables.c component of the Linux kernel allows an attacker to gain privileges or cause a Denial of Service (DoS) through user namespace. It is crucial for organizations to address this issue to protect their infrastructure.
Who is impacted by this?
CVE-2021-22555 affects users running Linux kernel versions from 2.6.19-rc1 to 5.12, including various software like Brocade Fabric Operating System, NetApp FAS 8300 Firmware, and NetApp AFF A400 Firmware. This vulnerability can allow an attacker to gain privileges or cause a denial of service, putting a wide range of Linux-based systems at risk.
What to do if CVE-2021-22555 affected you
If you're affected by the CVE-2021-22555 vulnerability, it's important to take action to protect your system. To do this, follow these steps:
Update your Linux kernel to the latest version containing the patch for this vulnerability.
Limit access to the affected system and restrict user privileges to reduce potential impact.
Monitor your system for signs of compromise or unusual activity.
Follow best practices for system hardening and user access control.
Is this in CISA’s Known Exploited Vulnerabilities Catalog?
CVE-2021-22555 is not listed in CISA's Known Exploited Vulnerabilities Catalog. This vulnerability, known as Linux Kernel Netfilter Heap Out-Of-Bounds Write, was added to relevant sources on July 16, 2021. There is no specified due date or required action mentioned in the sources.
Weakness Enumeration
The weakness enumeration for this vulnerability is categorized as CWE-787, an out-of-bounds write issue affecting the Linux kernel's netfilter subsystem.
Learn More
For comprehensive information on this vulnerability, consult the NVD page and the sources listed below.
Rapidly implement a modern Zero Trust network that is more secure and maintainable than VPNs.
CVE-2021-22555 Report - Details, Severity, & Advisories
Twingate Team
•
Jul 4, 2024
What is CVE-2021-22555?
CVE-2021-22555 is a high-severity vulnerability affecting Linux-based systems since version 2.6.19-rc1. This heap out-of-bounds write vulnerability in the net/netfilter/x_tables.c component of the Linux kernel allows an attacker to gain privileges or cause a Denial of Service (DoS) through user namespace. It is crucial for organizations to address this issue to protect their infrastructure.
Who is impacted by this?
CVE-2021-22555 affects users running Linux kernel versions from 2.6.19-rc1 to 5.12, including various software like Brocade Fabric Operating System, NetApp FAS 8300 Firmware, and NetApp AFF A400 Firmware. This vulnerability can allow an attacker to gain privileges or cause a denial of service, putting a wide range of Linux-based systems at risk.
What to do if CVE-2021-22555 affected you
If you're affected by the CVE-2021-22555 vulnerability, it's important to take action to protect your system. To do this, follow these steps:
Update your Linux kernel to the latest version containing the patch for this vulnerability.
Limit access to the affected system and restrict user privileges to reduce potential impact.
Monitor your system for signs of compromise or unusual activity.
Follow best practices for system hardening and user access control.
Is this in CISA’s Known Exploited Vulnerabilities Catalog?
CVE-2021-22555 is not listed in CISA's Known Exploited Vulnerabilities Catalog. This vulnerability, known as Linux Kernel Netfilter Heap Out-Of-Bounds Write, was added to relevant sources on July 16, 2021. There is no specified due date or required action mentioned in the sources.
Weakness Enumeration
The weakness enumeration for this vulnerability is categorized as CWE-787, an out-of-bounds write issue affecting the Linux kernel's netfilter subsystem.
Learn More
For comprehensive information on this vulnerability, consult the NVD page and the sources listed below.
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