CVE-2022-28733

Name: CVE-2022-28733
Creator: NVD / NIST
Published: 2023-07-20T01:15:10.14+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 1.28%

Last modified Jun 17, 2026

CVE-2022-28733 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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. EPSS estimates a 1.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

1.28%

66.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Gnu	Grub2	>= 2.00, < 2.06-3

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733Third Party Advisory
https://security.netapp.com/advisory/ntap-20230825-0002/
https://www.openwall.com/lists/oss-security/2022/06/07/5Mailing List, Third Party Advisory
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28733Third Party Advisory
https://security.netapp.com/advisory/ntap-20230825-0002/
https://www.openwall.com/lists/oss-security/2022/06/07/5Mailing List, Third Party Advisory

Timeline

Published: Jul 20, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-28733?

How severe is CVE-2022-28733?

CVE-2022-28733 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 1.28% probability of exploitation in the next 30 days.

How do I fix CVE-2022-28733?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-28733?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST