CVE-2021-22555
Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE
- Published
- Jul 7, 2021
- Updated
- Dec 30, 2025
- Assigning CNA
- Evidence observed
- Jul 15, 2021
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:HHigh · next 30 days
- Percentile
- 99.6%
- Model date
- Oct 19, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
CISA Known Exploited
This CVE appears in the CISA Known Exploited Vulnerabilities catalog.
Summary
A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space
Sources
modules/exploits/linux/local/netfilter_xtables_heap_oob_write_priv_esc.rb
Metasploit Framework modulesDeclared conditions
- platform: Linux($.exploit_linux/local/netfilter_xtables_heap_oob_write_priv_esc.platform)
- verification: check_declared($.exploit_linux/local/netfilter_xtables_heap_oob_write_priv_esc.check)
- kernel-exploitsExploit
Various kernel exploits
Containerized reproducer for CVE-2021-22555 Linux privilege escalation, with seccomp mitigation profiles and deployment guidance for Kubernetes and OpenShift clusters.
- CVE-2021-22555Exploit
This repo hosts TUKRU's Linux Privilege Escalation exploit (CVE-2021-22555). It demonstrates gaining root privileges via a vulnerability. Tested on Ubuntu 5.8.0-48-generic and COS 5.4.89+. Use responsibly and ethically.
- CVE-2021-22555-PipeVersionExploit
CVE-2021-22555 exploit rewritten with pipe primitive
Proof-of-concept exploit for CVE-2021-22555, a Linux kernel heap out-of-bounds write vulnerability leading to local privilege escalation.
- CVE-2021-22555-ExploitExploit
CVE-2021-22555 Exploit
Heap overflow exploit for CVE-2021-22555 achieving local privilege escalation to root on Ubuntu 20.04 with kernel 5.8.0-48.
Linux kernel privilege escalation exploit for CVE-2021-22555. Provides a proof-of-concept to demonstrate the vulnerability and achieve root access on affected systems.
- CVE-2021-22555Exploit
Linux kernel heap overflow exploit for CVE-2021-22555 enabling local privilege escalation through Netfilter subsystem vulnerability.
- cve-2021-22555Exploit
Exploit for CVE-2021-22555, a Linux kernel heap out-of-bounds write vulnerability leading to local privilege escalation.
- CVE-2021-22555Exploit
Linux kernel heap-based privilege escalation exploit for CVE-2021-22555, targeting netfilter subsystem to achieve local root access.
- netsec-projectExploit
Script of Network Security Project - Attack on CVE-2021-22555
- CVE-2021-22555Exploit
Linux Kernel 2.6.19 < 5.9 - 'Netfilter Local Privilege Escalation'
- kernel-exploit-factoryResearch
Linux kernel CVE exploit analysis report and relative debug environment. You don't need to compile Linux kernel and configure your environment anymore.
TheFloW · linux · Jul 15, 2021
Responsible use
Use vulnerability information only on systems you own or are authorized to test. Kitploit links to public research metadata and does not store exploit code or malicious payloads.