usn-8423-1
Vulnerability from osv_ubuntu
Published
2026-06-11 18:54
Modified
2026-06-17 22:06
Summary
lwip vulnerabilities
Details

It was discovered that lwIP contained a buffer overflow in the EAP authentication handling code. An attacker could possibly use this issue to trigger a buffer overflow, resulting in arbitrary code execution or a denial of service. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-8597)

It was discovered that lwIP incorrectly handled certain ICMPv6 or 6LoWPAN packets. An attacker could possibly use this issue to trigger a buffer overflow, resulting in information disclosure. This issue only affected Ubuntu 20.04 LTS. (CVE-2020-22283, CVE-2020-22284)

It was discovered that lwIP did not properly validate certain SNMPv3 authentication parameters. An attacker could possibly use this issue to trigger a stack-based buffer overflow, resulting in arbitrary code execution or a denial of service. (CVE-2026-8836)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-8597",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-22283",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2020-22284",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-8836",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblwip0",
            "binary_version": "2.1.2+dfsg1-4ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "lwip",
        "purl": "pkg:deb/ubuntu/lwip@2.1.2+dfsg1-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.2+dfsg1-4ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.2-3",
        "2.1.2-5.1",
        "2.1.2+dfsg1-1",
        "2.1.2+dfsg1-4"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-8836",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblwip0",
            "binary_version": "2.1.3+dfsg1-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "lwip",
        "purl": "pkg:deb/ubuntu/lwip@2.1.3+dfsg1-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.3+dfsg1-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.2+dfsg1-8",
        "2.1.2+dfsg1-9",
        "2.1.3+dfsg1-1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-8836",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblwip0t64",
            "binary_version": "2.2.0+dfsg1-6.1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "lwip",
        "purl": "pkg:deb/ubuntu/lwip@2.2.0+dfsg1-6.1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.0+dfsg1-6.1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.3+dfsg1-2",
        "2.1.3+dfsg1-4",
        "2.2.0+dfsg1-2",
        "2.2.0+dfsg1-3",
        "2.2.0+dfsg1-4",
        "2.2.0+dfsg1-5",
        "2.2.0+dfsg1-6",
        "2.2.0+dfsg1-6.1",
        "2.2.0+dfsg1-6.1build1",
        "2.2.0+dfsg1-6.1build2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-8836",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblwip0t64",
            "binary_version": "2.2.1+dfsg1-4ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "lwip",
        "purl": "pkg:deb/ubuntu/lwip@2.2.1+dfsg1-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.1+dfsg1-4ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.2.1+dfsg1-2",
        "2.2.1+dfsg1-3",
        "2.2.1+dfsg1-4"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that lwIP contained a buffer overflow in the EAP\nauthentication handling code. An attacker could possibly use this issue\nto trigger a buffer overflow, resulting in arbitrary code execution or a\ndenial of service. This issue only affected Ubuntu 20.04 LTS.\n(CVE-2020-8597)\n\nIt was discovered that lwIP incorrectly handled certain ICMPv6 or\n6LoWPAN packets. An attacker could possibly use this issue to trigger a\nbuffer overflow, resulting in information disclosure. This issue only\naffected Ubuntu 20.04 LTS. (CVE-2020-22283, CVE-2020-22284)\n\nIt was discovered that lwIP did not properly validate certain SNMPv3\nauthentication parameters. An attacker could possibly use this issue to\ntrigger a stack-based buffer overflow, resulting in arbitrary code\nexecution or a denial of service. (CVE-2026-8836)",
  "id": "USN-8423-1",
  "modified": "2026-06-17T22:06:46Z",
  "published": "2026-06-11T18:54:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8423-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-8597"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-22283"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-22284"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-8836"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "lwip vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-8597",
    "UBUNTU-CVE-2020-22283",
    "UBUNTU-CVE-2020-22284",
    "UBUNTU-CVE-2026-8836"
  ]
}



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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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