What is the CVSS score of CVE-2021-22555?

CVE-2021-22555 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 78.7%.

Is there a public PoC exploit available for CVE-2021-22555?

Yes, a public proof-of-concept exploit is available for CVE-2021-22555. Prioritise patching immediately. EPSS: 78.7%.

Is there a patch available for CVE-2021-22555?

Yes, a patch is available for CVE-2021-22555. Update the affected software to the latest version immediately.

C400 Firmware CVE-2021-22555

HIGH

Out-of-bounds Write (CWE-787)

2021-07-07 cve-coordination@google.com

Buffer Overflow Memory Corruption C400 Firmware C250 Firmware H410c Firmware H300s Firmware H500s Firmware H700s Firmware H410s Firmware Linux Kernel Fabric Operating System Fas 8300 Firmware Fas 8700 Firmware Aff A400 Firmware Aff A250 Firmware Aff 500F Firmware H610C Firmware H610S Firmware H615C Firmware Cloud Backup Hci Management Node Solidfire Solidfire Baseboard Management Controller

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Jul 14, 2026 - 04:22 CISA

CVE Published

Jul 07, 2021 - 12:15 nvd

HIGH 7.8

DescriptionNVD

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

AnalysisAI

A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. Rated high severity (CVSS 7.8), this vulnerability is low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Write (CWE-787), which allows attackers to write data beyond allocated buffer boundaries leading to code execution or crashes. 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 products include: Netapp C400 Firmware, Netapp C250 Firmware, Netapp H410C Firmware, Netapp H300S Firmware, Netapp H500S Firmware.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate write boundaries, use memory-safe languages, enable compiler protections (ASLR, stack canaries).