{"id":"CVE-2021-22555","aliases":["A-184847809","PUB-A-184847809"],"url":"https://o3.security/vulnerability/CVE-2021-22555","summary":null,"details":"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":"2021-07-07T12:15:08.453Z","modified":"2026-03-15T22:39:10.716531Z","cvss":{"score":7.8,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.78684,"percentile":0.9956,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":17,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-22555"},{"type":"ADVISORY","url":"http://packetstormsecurity.com/files/163528/Linux-Kernel-Netfilter-Heap-Out-Of-Bounds-Write.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20210805-0010/"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=9fa492cdc160cd27ce1046cb36f47d3b2b1efa21"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/net/netfilter/x_tables.c?id=b29c457a6511435960115c0f548c4360d5f4801d"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/164155/Kernel-Live-Patch-Security-Notice-LSN-0081-1.html"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/164437/Netfilter-x_tables-Heap-Out-Of-Bounds-Write-Privilege-Escalation.html"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html"},{"type":"EVIDENCE","url":"https://github.com/google/security-research/security/advisories/GHSA-xxx5-8mvq-3528"},{"type":"EVIDENCE","url":"http://packetstormsecurity.com/files/163878/Kernel-Live-Patch-Security-Notice-LSN-0080-1.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-15T22:39:10.716531Z"}}