CVSS v3
7.8
HIGH
EPSS Score
85.2%
exploit probability
CISA KEV
Yes
known exploited
Exploitation
—
SSVC status
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
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
Yes. CVE-2021-22555 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 10/27/2025.
CVE-2021-22555 has a CVSS v3 base score of 7.8 (HIGH severity).
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Ranked by exploit probability (EPSS).