{"id":"CVE-2022-28733","url":"https://www.cyber-defence.io/tools/cve/CVE-2022-28733","generatedAt":"2026-10-27T21:08:31.683Z","title":"Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value.","description":"Integer underflow in grub_net_recv_ip4_packets; A malicious crafted IP packet can lead to an integer underflow in grub_net_recv_ip4_packets() function on rsm->total_len value. Under certain circumstances the total_len value may end up wrapping around to a small integer number which will be used in memory allocation. If the attack succeeds in such way, subsequent operations can write past the end of the buffer.","published":"2023-07-20T01:15:10.000Z","lastModified":"2026-06-17T04:38:56.000Z","status":"Modified","sourceIdentifier":"security@ubuntu.com","cvss":{"version":"3.1","score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-191"],"affected":["gnu/grub2"],"epss":{"score":0.01273,"percentile":0.69687,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733","tags":["Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://security.netapp.com/advisory/ntap-20230825-0002/","source":"security@ubuntu.com"},{"url":"https://www.openwall.com/lists/oss-security/2022/06/07/5","tags":["Mailing List","Third Party Advisory"],"source":"security@ubuntu.com"},{"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20230825-0002/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.openwall.com/lists/oss-security/2022/06/07/5","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2022-28733","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}