Vulnerability Details : CVE-2021-22555

Public exploit exists!
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
Published 2021-07-07 12:15:08
Updated 2022-03-31 19:15:33
Source Google Inc.
View at NVD,   CVE.org
Vulnerability category: Memory CorruptionDenial of service

Products affected by CVE-2021-22555

Exploit prediction scoring system (EPSS) score for CVE-2021-22555

EPSS FAQ
0.28%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 68 %
Percentile, the proportion of vulnerabilities that are scored at or less

Metasploit modules for CVE-2021-22555

  • Netfilter x_tables Heap OOB Write Privilege Escalation
    Disclosure Date: 2021-07-07
    First seen: 2022-12-23
    exploit/linux/local/netfilter_xtables_heap_oob_write_priv_esc
    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. Kernels up to 5.11 (including) are vulnerable.

CVSS scores for CVE-2021-22555

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.6
 MEDIUM AV:L/AC:L/Au:N/C:P/I:P/A:P
3.9
6.4
 NIST
8.3
 HIGH CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
1.6
6.0
 Google Inc.
7.8
 HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
 NIST

CWE ids for CVE-2021-22555

  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • cve-coordination@google.com (Secondary)
    • nvd@nist.gov (Primary)

References for CVE-2021-22555

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