CVE-2022-28733

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2023-07-20. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.1Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
67.1%
KEV
Not listed

Published

July 20, 2023

Last Modified

November 21, 2024

References (6)

Vendor Advisories for CVE-2022-28733(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntushim-signed (1.51.3+15.7-0ubuntu1) @ jammy2026-05-23ubuntu
redhatgrub2-1:2.02-0.87.el7_9.112022-12-08redhat
redhatredhat-virtualization-host-0:4.5.1-202207170705_8.62022-07-21redhat
redhatgrub2-1:2.02-99.el8_4.92022-06-16redhat
redhatgrub2-1:2.06-27.el9_0.72022-06-16redhat
redhatgrub2-1:2.02-123.el8_6.82022-06-16redhat
redhatgrub2-1:2.02-87.el8_1.102022-06-16redhat
redhatgrub2-1:2.02-87.el8_2.102022-06-16redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 12× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 111 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2022-28733?
CVE-2022-28733 is a high vulnerability published on July 20, 2023. Integer underflow in grubnetrecvip4packets; A malicious crafted IP packet can lead to an integer underflow in grubnetrecvip4packets() function on rsm->totallen value. Under certain circumstances the totallen value may end up wrapping around to a small integer number which will be used in memory…
When was CVE-2022-28733 disclosed?
CVE-2022-28733 was first published in the National Vulnerability Database on July 20, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-28733 actively exploited?
CVE-2022-28733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2022-28733?
CVE-2022-28733 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2022-28733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-28733, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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