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Fencer Intel
medium 5.5

CVE-2020-3810 json

Missing input validation in the ar/tar implementations of APT before version 2.1.2 could result in denial of service when processing specia…

published 6y ago modified 4mo ago also EUVD-2020-25075

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
0
none known

Summary

Missing input validation in the ar/tar implementations of APT before version 2.1.2 could result in denial of service when processing specially crafted deb files.

Patch / fix

  • debian apt 2.1.2
  • apt Debian 14, Debian 13, Debian 12 2.1.2

debian advisories DEBIAN-CVE-2020-3810

  • apt Ubuntu 16.04 LTS 1.2.32ubuntu0.1
  • apt Ubuntu 18.04 LTS 1.6.12ubuntu0.1
  • apt Ubuntu 20.04 LTS 2.0.2ubuntu0.1
  • apt Ubuntu Pro 14.04 LTS 1.0.1ubuntu2.24+esm1

ubuntu advisories UBUNTU-CVE-2020-3810

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2020-3810 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-3810 updated cvss 5.5

apt: missing input validation in the ar/tar implementations leads to DoS

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/Debian/apt/issues/111 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • Debian apt

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.