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Fencer Intel
high 7.5

CVE-2020-6097 json

An exploitable denial of service vulnerability exists in the atftpd daemon functionality of atftp 0.7.git20120829-3.1+b1.

published 6y ago modified 4mo ago also EUVD-2020-27251

cvss
7.5
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

An exploitable denial of service vulnerability exists in the atftpd daemon functionality of atftp 0.7.git20120829-3.1+b1. A specially crafted sequence of RRQ-Multicast requests trigger an assert() call resulting in denial-of-service. An attacker can send a sequence of malicious packets to trigger this vulnerability.

Patch / fix

  • atftp Debian 14, Debian 13, Debian 12 0.7.git20120829-3.2

debian advisories DEBIAN-CVE-2020-6097

  • atftp Ubuntu 20.04 LTS 0.7.git20120829-3.1ubuntu0.1
  • atftp Ubuntu Pro 16.04 LTS 0.7.git20120829-3.1~0.16.04.1+esm1
  • atftp Ubuntu Pro 18.04 LTS 0.7.git20120829-3.1~0.18.04.1+esm1

ubuntu advisories UBUNTU-CVE-2020-6097

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

  • atftp openSUSE Tumbleweed 0.7.5-1.1
  • atftp openSUSE Leap 15.2 0.7.2-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:10636-1openSUSE-SU-2020:1736-1

  • atftp Arch Linux 0.7.2-3

arch linux advisories AVG-1395

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Exploit prediction

2.15% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • talosintelligence.com https://talosintelligence.com/vulnerability_reports/TALOS-2020-1029 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • n/a atftpd

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.