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Fencer Vulns
high 8.8

CVE-2021-25684 json

apport can be stalled by reading a FIFO

published 2021-06-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-12576

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits
0
none known

Summary

It was discovered that apport in data/apport did not properly open a report file to prevent hanging reads on a FIFO.

Patch / fix

  • Canonical apport 2.20.1-0ubuntu2.30, 2.20.9-0ubuntu7.23, 2.20.11-0ubuntu27.16, 2.20.11-0ubuntu50.5
  • apport Ubuntu 16.04 LTS 2.20.1-0ubuntu2.30
  • apport Ubuntu 18.04 LTS 2.20.9-0ubuntu7.23
  • apport Ubuntu 20.04 LTS 2.20.11-0ubuntu27.16
  • apport Ubuntu Pro 14.04 LTS 2.14.1-0ubuntu3.29+esm6

ubuntu advisories UBUNTU-CVE-2021-25684

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

Exploit prediction

0.57% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/ubuntu/+source/apport/+bug/1912326 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • Canonical apport

Classification

Weakness
  • CWE-20 Improper Input Validation

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.