USN-8248-2 (UBUNTU-CVE-2021-33450)

Vulnerability from osv_ubuntu – Published: 2026-05-08 14:22 – Updated: 2026-05-08 14:22 – Source website
VLAI
Summary
nasm regression
Details

USN-8248-1 fixed vulnerabilities in NASM. Unfortunately the update introduced a regression which could cause NASM to crash. This update fixes the problem by reverting the fix for CVE-2021-33450 and CVE-2021-33452 in Ubuntu 24.04 LTS.

We apologize for the inconvenience.

Original advisory details:

Daisy Chen discovered that NASM was vulnerable to a heap buffer overflow when handling certain input. An attacker could possibly use this issue to cause NASM to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-31722)

It was discovered that NASM incorrectly handled memory allocation. An attacker could possibly use this issue to cause NASM to use excessive resources, leading to a denial of service. This issue only affected Ubuntu 24.04 LTS. (CVE-2021-33452, CVE-2021-33450)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-33450",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-33452",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "nasm",
            "binary_version": "2.16.01-1ubuntu0.1~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "nasm",
        "purl": "pkg:deb/ubuntu/nasm@2.16.01-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.16.01-1ubuntu0.1~esm2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.16.01-1",
        "2.16.01-1build1",
        "2.16.01-1ubuntu0.1~esm1"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-8248-1 fixed vulnerabilities in NASM. Unfortunately the update\nintroduced a regression which could cause NASM to crash. This update fixes\nthe problem by reverting the fix for CVE-2021-33450 and CVE-2021-33452 in\nUbuntu 24.04 LTS.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Daisy Chen discovered that NASM was vulnerable to a heap buffer overflow\n when handling certain input. An attacker could possibly use this issue  to\n cause NASM to crash, resulting in a denial of service, or  possibly\n execute arbitrary code. (CVE-2023-31722)\n\n It was discovered that NASM incorrectly handled memory allocation.  An\n attacker could possibly use this issue to cause NASM to use  excessive\n resources, leading to a denial of service. This issue  only affected\n Ubuntu 24.04 LTS. (CVE-2021-33452, CVE-2021-33450)",
  "id": "USN-8248-2",
  "modified": "2026-05-08T14:22:34Z",
  "published": "2026-05-08T14:22:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8248-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33450"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-33452"
    },
    {
      "type": "REPORT",
      "url": "https://launchpad.net/bugs/2151861"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "nasm regression",
  "upstream": [
    "UBUNTU-CVE-2021-33450",
    "UBUNTU-CVE-2021-33452"
  ]
}



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