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Fencer Vulns
medium 5.5

CVE-2020-23903 json

A Divide by Zero vulnerability in the function static int read_samples of Speex v1.2 allows attackers to cause a denial of service (DoS) vi…

published 2021-11-10 4 y ago modified 2026-06-17 4 mo ago also EUVD-2020-16640

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

A Divide by Zero vulnerability in the function static int read_samples of Speex v1.2 allows attackers to cause a denial of service (DoS) via a crafted WAV file.

Patch / fix

  • speex Debian 14, Debian 13, Debian 12 1.2~rc1.2-2

debian advisories DEBIAN-CVE-2020-23903

  • speex Ubuntu 18.04 LTS 1.2~rc1.2-1ubuntu2.1
  • speex Ubuntu 20.04 LTS 1.2~rc1.2-1.1ubuntu1.20.04.1
  • speex Ubuntu 22.04 LTS 1.2~rc1.2-1.1ubuntu3
  • speex Ubuntu Pro 16.04 LTS 1.2~rc1.2-1ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2020-23903

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

  • speex RHEL 9 1.2.0-11.el9

red hat advisories RHSA-2022:7979

  • speex SLE Module for Package Hub 15 SP3, SLE Module for Package Hub 15 SP2, SLE Module for Basesystem 15 SP3 +1 more 1.2-3.3.1
  • speex SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.1.999_1.2rc1-24.3.1

suse advisories SUSE-SU-2021:3860-1SUSE-SU-2021:3858-1

  • speex openSUSE Tumbleweed 1.2-2.1
  • speex openSUSE Leap 15.2 1.2-lp152.4.3.1
  • speex openSUSE Leap 15.3 1.2-3.3.1

opensuse advisories openSUSE-SU-2024:11632-1openSUSE-SU-2021:1538-1openSUSE-SU-2021:3860-1

  • speex AlmaLinux 9 1.2.0-11.el9

almalinux advisories ALSA-2022:7979

  • speex Rocky Linux 9 1.2.0-11.el9

rocky linux advisories RLSA-2022:7979

  • speex Arch Linux 1.2.1-1

arch linux advisories AVG-2544

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-2020-23903 updated cvss 5.5

speex: divide by zero in read_samples() via crafted WAV file

  • Red Hat Enterprise Linux 6 speex, speex-tools Red Hat Enterprise Linux 7 speex, speex-tools
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 speex
    affected: no fix available “Fix deferred”
  • Red Hat CodeReady Linux Builder (v. 9) speex-devel 1.2.0-11.el9, speex-debuginfo 1.2.0-11.el9, speex-debugsource 1.2.0-11.el9, speex-tools-debuginfo 1.2.0-11.el9 Red Hat Enterprise Linux AppStream (v. 9) speex 1.2.0-11.el9
    fixed: vendor fix RHSA-2022:7979

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

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/xiph/speex/issues/13 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

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.