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CVE-2021-22555

Known Exploited (CISA KEV)HIGH
8.3
CVSS Severity Score
EPSS Score56.0610%
EPSS Percentile90.86th
PublishedJul 7, 2021
Last ModifiedOct 27, 2025

Vulnerability Description

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

Affected Platforms (CPE)

💻
Netapp

C400 Firmware

All versions
💻
Netapp

C250 Firmware

All versions
💻
Netapp

H410c Firmware

All versions
💻
Netapp

H300s Firmware

All versions
💻
Netapp

H500s Firmware

All versions
💻
Netapp

H700s Firmware

All versions
💻
Netapp

H410s Firmware

All versions
💻
Linux

Linux Kernel

>= 2.6.19 and < 4.4.267
💻
Linux

Linux Kernel

>= 4.5 and < 4.9.267
💻
Linux

Linux Kernel

>= 4.10 and < 4.14.231
💻
Linux

Linux Kernel

>= 4.15 and < 4.19.188
💻
Linux

Linux Kernel

>= 4.20 and < 5.4.113
💻
Linux

Linux Kernel

>= 5.5 and < 5.10.31
💻
Linux

Linux Kernel

>= 5.11 and < 5.12
💻
Brocade

Fabric Operating System

All versions
💻
Netapp

Fas 8300 Firmware

All versions
💻
Netapp

Fas 8700 Firmware

All versions
💻
Netapp

Aff A400 Firmware

All versions
💻
Netapp

Aff A250 Firmware

All versions
💻
Netapp

Aff 500f Firmware

All versions
💻
Netapp

H610c Firmware

All versions
💻
Netapp

H610s Firmware

All versions
💻
Netapp

H615c Firmware

All versions
📦
Netapp

Cloud Backup

All versions
📦
Netapp

Hci Management Node

All versions
📦
Netapp

Solidfire

All versions
📦
Netapp

Solidfire Baseboard Management Controller

All versions

References & Advisories

🔗 http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html
🔗 http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html
🔗 http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html
🔗 http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html
🔗 http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
🔗 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21
🔗 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d
🔗 https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528

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