CVE catalog

CVE-2020-21687

nasm affected and fixed versions

[CVE catalog]

Buffer Overflow vulnerability in scan function in stdscan.c in nasm 2.15rc0 allows remote attackers to cause a denial of service via crafted asm file.

Severity
Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Published
Source
[NVD] · [CVE record]
EPSS
0.44% · Oct 27, 2026

Projects and upstream resources

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / releasePackageVersionStatusSource
Debiantrixienasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debiantrixienasm2.16.03-1Fixed[CVE-2020-21687]
Debiansidnasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debiansidnasm3.01-1Fixed[CVE-2020-21687]
Debianforkynasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debianforkynasm3.01-1Fixed[CVE-2020-21687]
Debianbookwormnasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debianbookwormnasm2.16.01-1Fixed[CVE-2020-21687]

Showing 8 fix observations. All 9 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
UnknownRelease not reportednasm2.15.04-1UnknownSource applicability is not establishedProvider not reported
Debianbookwormnasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debianbookwormnasm2.16.01-1Fixed[CVE-2020-21687]
Debianforkynasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debianforkynasm3.01-1Fixed[CVE-2020-21687]
Debiansidnasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debiansidnasm3.01-1Fixed[CVE-2020-21687]
Debiantrixienasm2.15.04-1FixedDistribution-reported fixed boundary[CVE-2020-21687]
Debiantrixienasm2.16.03-1Fixed[CVE-2020-21687]
Original provider fields
{
  "package_releases": [
    {
      "name": "nasm",
      "status": "fixed",
      "release": "sid",
      "version": "3.01-1"
    },
    {
      "name": "nasm",
      "status": "fixed",
      "release": "forky",
      "version": "3.01-1"
    },
    {
      "name": "nasm",
      "status": "fixed",
      "release": "trixie",
      "version": "2.16.03-1"
    },
    {
      "name": "nasm",
      "status": "fixed",
      "release": "bookworm",
      "version": "2.16.01-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "2.15.04-1"
    },
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "2.15.04-1"
    },
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "2.15.04-1"
    },
    {
      "bug": null,
      "name": "nasm",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "2.15.04-1"
    }
  ],
  "distribution_packages": [
    {
      "name": "nasm",
      "fixed_version": "2.15.04-1",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [nasm]Unknown
    Details (2)

    • 2.16.01-1 · amd64 · bookworm

      Fixed · Fixed: 2.15.04-1

      dsa · nasm · debian · bookworm; dsa · nasm · debian · 12

    • 2.16.01-1 · arm64 · bookworm

      Fixed · Fixed: 2.15.04-1

      dsa · nasm · debian · bookworm; dsa · nasm · debian · 12

[Debian 13 (Trixie)]

  • [nasm]Unknown
    Details (2)

    • 2.16.03-1 · amd64 · trixie

      Fixed · Fixed: 2.15.04-1

      dsa · nasm · debian · 13

    • 2.16.03-1 · arm64 · trixie

      Fixed · Fixed: 2.15.04-1

      dsa · nasm · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]