Vulnerability Intelligence Report
Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE
CVE-2021-22555
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
CISA KEV
SSVC: Active Exploitation
CVSS Base Score
8.3
HIGH
Exploitability:1.7
Impact Score:6.1
EPSS Probability:78.68%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-787 ↗CWE-787 Out-of-bounds Write
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| netapp | c400_firmware | all |
| netapp | c400 | all |
| netapp | c250_firmware | all |
| netapp | c250 | all |
| netapp | h410c_firmware | all |
| netapp | h410c | all |
| netapp | h300s_firmware | all |
| netapp | h300s | all |
| netapp | h500s_firmware | all |
| netapp | h500s | all |
| netapp | h700s_firmware | all |
| netapp | h700s | all |
| netapp | h410s_firmware | all |
| netapp | h410s | all |
| linux | linux_kernel | all |
| brocade | fabric_operating_system | all |
| netapp | fas_8300_firmware | all |
| netapp | fas_8300 | all |
| netapp | fas_8700_firmware | all |
| netapp | fas_8700 | all |
| netapp | aff_a400_firmware | all |
| netapp | aff_a400 | all |
| netapp | aff_a250_firmware | all |
| netapp | aff_a250 | all |
| netapp | aff_500f_firmware | all |
| netapp | aff_500f | all |
| netapp | h610c_firmware | all |
| netapp | h610c | all |
| netapp | h610s_firmware | all |
| netapp | h610s | all |
| netapp | h615c_firmware | all |
| netapp | h615c | all |
| netapp | cloud_backup | all |
| netapp | hci_management_node | all |
| netapp | solidfire | all |
| netapp | solidfire_baseboard_management_controller | all |
Threat Intelligence Signals
CISA KEV
ACTIVE IN CATALOG
EPSS Score
78.684%
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Google LLC · Vendor · USA |
| Reserved | 2021-01-05T00:00:00 |
| Published | 2021-07-07T11:20:10 |
| Patch Date | 2021-07-04 |
| Last Updated | 2025-12-30T20:32:33 |
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