CVE catalog

CVE-2020-21674

libarchive affected and fixed versions

Heap-based buffer overflow in archive_string_append_from_wcs() (archive_string.c) in libarchive-3.4.1dev allows remote attackers to cause a denial of service (out-of-bounds write in heap memory resulting into a crash) via a crafted archive file. NOTE: this only affects users who downloaded the development code from GitHub. Users of the product's official releases are unaffected.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: Jan 1, 2020, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.08% · Oct 27, 2026

Projects and upstream resources

[libarchive][Source-reported homepage]

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 / release	Package	Version	Status	Source
Debiantrixie	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debiantrixie	libarchive	`3.7.4-4+deb13u1`	Not affected	[CVE-2020-21674]
Debiansid	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debiansid	libarchive	`3.8.10-2`	Not affected	[CVE-2020-21674]
Debianforky	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debianforky	libarchive	`3.8.9-1`	Not affected	[CVE-2020-21674]
Debianbookworm-security	libarchive	`3.6.2-1+deb12u5`	Not affected	[CVE-2020-21674]
Debianbookworm	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debianbookworm	libarchive	`3.6.2-1+deb12u4`	Not affected	[CVE-2020-21674]
UnknownRelease not reported	libarchive	Not reported	UnknownSource applicability is not established	Provider not reported

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	libarchive	Not reported	UnknownSource applicability is not established	Provider not reported
Debianbookworm	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debianbookworm	libarchive	`3.6.2-1+deb12u4`	Not affected	[CVE-2020-21674]
Debianbookworm-security	libarchive	`3.6.2-1+deb12u5`	Not affected	[CVE-2020-21674]
Debianforky	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debianforky	libarchive	`3.8.9-1`	Not affected	[CVE-2020-21674]
Debiansid	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debiansid	libarchive	`3.8.10-2`	Not affected	[CVE-2020-21674]
Debiantrixie	libarchive	Not reported	Not affectedDistribution reports not affected	[CVE-2020-21674]
Debiantrixie	libarchive	`3.7.4-4+deb13u1`	Not affected	[CVE-2020-21674]

Original provider fields

{
  "package_releases": [
    {
      "name": "libarchive",
      "status": "not affected",
      "release": "sid",
      "version": "3.8.10-2"
    },
    {
      "name": "libarchive",
      "status": "not affected",
      "release": "forky",
      "version": "3.8.9-1"
    },
    {
      "name": "libarchive",
      "status": "not affected",
      "release": "trixie",
      "version": "3.7.4-4+deb13u1"
    },
    {
      "name": "libarchive",
      "status": "not affected",
      "release": "bookworm",
      "version": "3.6.2-1+deb12u4"
    },
    {
      "name": "libarchive",
      "status": "not affected",
      "release": "bookworm-security",
      "version": "3.6.2-1+deb12u5"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": [
    {
      "name": "libarchive",
      "fixed_version": "0",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libarchive13]Unknown
Source package: [libarchive]
Details (4)
- 3.6.2-1+deb12u4 · amd64 · bookworm
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u4 · arm64 · bookworm
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · libarchive · debian · bookworm
[libarchive-dev]Unknown
Source package: [libarchive]
Details (4)
- 3.6.2-1+deb12u4 · amd64 · bookworm
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u4 · arm64 · bookworm
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · libarchive · debian · bookworm
[libarchive-tools]Unknown
Source package: [libarchive]
Details (4)
- 3.6.2-1+deb12u4 · amd64 · bookworm
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u4 · arm64 · bookworm
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · amd64 · bookworm-security
  Not affected
  dsa · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · arm64 · bookworm-security
  Not affected
  dsa · libarchive · debian · bookworm

Observed: Oct 23, 2026, 5:48:58 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [Red Hat security advisories and VEX]