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Fencer Vulns
medium 5.3

CVE-2021-46671 json

options.c in atftp before 0.7.5 reads past the end of an array, and consequently discloses server-side /etc/group data to a remote client.

published 2022-02-04 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33347

cvss
5.3
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 69%
public exploits
0
none known

Summary

options.c in atftp before 0.7.5 reads past the end of an array, and consequently discloses server-side /etc/group data to a remote client.

Patch / fix

  • atftp_project atftp 0.7.5
  • atftp Debian 14, Debian 13, Debian 12 0.7.git20210915-1

debian advisories DEBIAN-CVE-2021-46671

  • 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-2021-46671

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 SLES for SAP 12 SP5, SLES 12 SP5 0.7.0-160.14.1

suse advisories SUSE-SU-2022:0881-1

Exploit prediction

1.27% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.debian.org https://bugs.debian.org/1004974 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

References

Sources

Fencer Vulns 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.