CVE-2022-28733
No exploitation reported by the sources we read.
- Published2023-07-20
- Fixed in2.06-3
- WeaknessCWE-191
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2023-07-2001:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-28733?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-28733?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.x | ≥ 2.00, < 2.06-3 | 2.06-3 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- grub2-toolsAlmaLinux:9all versions · fixed in 1:2.06-27.el9_0.7.almaand 14 other packages
- grub2-toolsAlmaLinux:8all versions · fixed in 1:2.02-123.el8_6.8.almaand 16 other packages
- shim-x64AlmaLinux:9all versions · fixed in 15.6-1.el9.almaand 2 other packages
- shim-x64AlmaLinux:8all versions · fixed in 15.6-1.el8.almaand 3 other packages
Fix
- Update Gnu grub2 to 2.06-3
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2023-07-20
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2022-28733?
Is CVE-2022-28733 actively exploited?
What is the CVSS score for CVE-2022-28733?
Running grub2-tools? Hear about its next vulnerability
Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.