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CVE-2022-28733

Status: ModifiedHigh (8.1)—

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

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

GNU — Grub2

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2022-28733",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2022-28733",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-10-24T19:49:29.972519Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@ubuntu.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 8.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.9,
        "exploitabilityScore": 2.2
      },
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          "confidentialityImpact": "HIGH"
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  "affected": [
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      "source": "security@ubuntu.com",
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          "vendor": "GNU Project",
          "product": "GNU GRUB",
          "versions": [
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              "version": "0",
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              "versionType": "semver"
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          "packageName": "grub2"
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  "published": "2023-07-20T01:15:10.140",
  "references": [
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      "tags": [
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      "source": "security@ubuntu.com"
    },
    {
      "url": "https://security.netapp.com/advisory/ntap-20230825-0002/",
      "source": "security@ubuntu.com"
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    {
      "url": "https://www.openwall.com/lists/oss-security/2022/06/07/5",
      "tags": [
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      "source": "security@ubuntu.com"
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      "tags": [
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security@ubuntu.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-191"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-191"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-06-17T04:38:56.200",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "criteria": "cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "2.06-3",
              "versionStartIncluding": "2.00"
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          "operator": "OR"
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  "sourceIdentifier": "security@ubuntu.com"
}