CVE-2021-22555

HighCVSS 7.8/10Known exploited (CISA KEV)Last modified Oct 13, 2026

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

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-787

Affected software

VendorProductVersions
n/aLinux Kernel>= 2.6.19-rc1, < unspecified

References

Timeline

Published
Jul 7, 2021
Last modified
Oct 13, 2026
Added to CISA KEV
Oct 6, 2025
NVD status
Analyzed

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CVE-2021-22555: High severity, CVSS 7.8 | Vulnix