Vulnerability Monitor

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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

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.3, indicating it requires adjacent network access but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 36 products from netapp, from netapp, from netapp and 33 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-07-07T12:15:08.453

Last Modified

2025-10-27T17:06:32.497

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 8.3 (HIGH)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:P

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: PARTIAL

Exploitability Score

3.9

Impact Score

6.4

Weaknesses

Type: Secondary
CWE-787
Type: Primary
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	netapp	c400_firmware	-	Yes
Hardware	netapp	c400	-	No
Operating System	netapp	c250_firmware	-	Yes
Hardware	netapp	c250	-	No
Operating System	netapp	h410c_firmware	-	Yes
Hardware	netapp	h410c	-	No
Operating System	netapp	h300s_firmware	-	Yes
Hardware	netapp	h300s	-	No
Operating System	netapp	h500s_firmware	-	Yes
Hardware	netapp	h500s	-	No
Operating System	netapp	h700s_firmware	-	Yes
Hardware	netapp	h700s	-	No
Operating System	netapp	h410s_firmware	-	Yes
Hardware	netapp	h410s	-	No
Operating System	linux	linux_kernel	< 4.4.267	Yes
Operating System	linux	linux_kernel	< 4.9.267	Yes
Operating System	linux	linux_kernel	< 4.14.231	Yes
Operating System	linux	linux_kernel	< 4.19.188	Yes
Operating System	linux	linux_kernel	< 5.4.113	Yes
Operating System	linux	linux_kernel	< 5.10.31	Yes
Operating System	linux	linux_kernel	< 5.12	Yes
Operating System	brocade	fabric_operating_system	-	Yes
Operating System	netapp	fas_8300_firmware	-	Yes
Hardware	netapp	fas_8300	-	No
Operating System	netapp	fas_8700_firmware	-	Yes
Hardware	netapp	fas_8700	-	No
Operating System	netapp	aff_a400_firmware	-	Yes
Hardware	netapp	aff_a400	-	No
Operating System	netapp	aff_a250_firmware	-	Yes
Hardware	netapp	aff_a250	-	No
Operating System	netapp	aff_500f_firmware	-	Yes
Hardware	netapp	aff_500f	-	No
Operating System	netapp	h610c_firmware	-	Yes
Hardware	netapp	h610c	-	No
Operating System	netapp	h610s_firmware	-	Yes
Hardware	netapp	h610s	-	No
Operating System	netapp	h615c_firmware	-	Yes
Hardware	netapp	h615c	-	No
Application	netapp	cloud_backup	-	Yes
Application	netapp	hci_management_node	-	Yes
Application	netapp	solidfire	-	Yes
Application	netapp	solidfire_baseboard_management_controller	*	Yes

References

http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html Third Party Advisory, VDB Entry ([email protected])
http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html Exploit, Third Party Advisory, VDB Entry ([email protected])
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 Mailing List, Patch, Vendor Advisory ([email protected])
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d Mailing List, Patch, Vendor Advisory ([email protected])
https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 Exploit, Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20210805-0010/ Third Party Advisory ([email protected])
http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21 Mailing List, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d Mailing List, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20210805-0010/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22555 US Government Resource (134c704f-9b21-4f2e-91b3-4a467353bcc0)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For netapp's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.