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Fencer Vulns
medium 5.5

CVE-2021-33844 json

A floating point exception (divide-by-zero) issue was discovered in SoX in functon startread() of wav.c file.

published 2022-08-25 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20518

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

A floating point exception (divide-by-zero) issue was discovered in SoX in functon startread() of wav.c file. An attacker with a crafted wav file, could cause an application to crash.

Patch / fix

  • sox Debian 13, Debian 12 14.4.2+git20190427-3.1

debian advisories DEBIAN-CVE-2021-33844

  • sox Ubuntu 18.04 LTS 14.4.2-3ubuntu0.18.04.2
  • sox Ubuntu 20.04 LTS 14.4.2+git20190427-2+deb11u1build0.20.04.1
  • sox Ubuntu 22.04 LTS 14.4.2+git20190427-2+deb11u1build0.22.04.1
  • sox Ubuntu Pro 14.04 LTS 14.4.1-3ubuntu1.1+esm2
  • sox Ubuntu Pro 16.04 LTS 14.4.1-5+deb8u4ubuntu0.1+esm1

ubuntu advisories UBUNTU-CVE-2021-33844

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

  • sox openSUSE Tumbleweed 14.4.2-8.1
  • sox Package Hub 15 SP5, openSUSE Leap 15.5 14.4.2-bp155.3.3.1
  • sox Package Hub 15 SP4, openSUSE Leap 15.4 14.4.2-bp154.2.3.1

opensuse advisories openSUSE-SU-2024:13359-1openSUSE-SU-2023:0329-1openSUSE-SU-2023:0328-1

  • sox Alpine 3.24, Alpine 3.23, Alpine 3.22 +4 more 14.4.2-r10

alpine advisories ALPINE-CVE-2021-33844

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2021-33844 updated cvss 3.3

SoX: divide by zero crash in wav.c

  • Red Hat Enterprise Linux AI (RHEL AI) sox
    affected: no fix available “Fix deferred”
  • Red Hat Enterprise Linux 5 sox Red Hat Enterprise Linux 7 sox
    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

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • sourceforge.net https://sourceforge.net/p/sox/bugs/349/ 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

Affected products

  • n/a SoX (Sound eXchange)

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.