speex: stack-based buffer overflow in speexenc.c via a crafted WAV file
Published Nov 10, 2021
5.5
MEDIUMCVSS 3.1
EPSS 0.72%
Description
A stack buffer overflow in speexenc.c of Speex v1.2 allows attackers to cause a denial of service (DoS) via a crafted WAV file. NOTE: the vendor states "I cannot reproduce it" and it "is a demo program.
Affected products
No data.
No data.
Red Hat Enterprise Linux 6
speex
Out of support scope
Red Hat Enterprise Linux 7
speex
Out of support scope
Red Hat Enterprise Linux 8
speex
Will not fix
Red Hat Enterprise Linux 9
speex
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | speex | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | speex | Out of support scope | n/a |
| Red Hat Enterprise Linux 8 | speex | Will not fix | n/a |
| Red Hat Enterprise Linux 9 | speex | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 0.72% (0.00719) | 52.25th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.70% (0.00696) | 47.97th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.15% (0.00153) | 33.46th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.07% (0.00073) | 33.69th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.07% (0.00069) | 30.40th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.07% (0.00069) | 28.38th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00044) | 10.56th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Jan 6, 2022 | 2.28% (0.02283) | 51.78th | v1 |
| Jan 5, 2022 | 0.52% (0.00518) | 31.20th | v5 (v2026.06.15) |
| Nov 11, 2021 | 0.52% (0.00518) | 30.65th | v1 |
References (5)
- https://access.redhat.com/security/cve/CVE-2020-23904 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024253 Issue Tracking
- https://github.com/xiph/speex/issues/14 x_refsource_MISCExploitIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2020-23904
- https://www.cve.org/CVERecord?id=CVE-2020-23904
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2020-23904 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2024253 | Issue Tracking | |
| https://github.com/xiph/speex/issues/14 | x_refsource_MISCExploitIssue TrackingThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2020-23904 | ||
| https://www.cve.org/CVERecord?id=CVE-2020-23904 |
Change history (0)
No recorded changes yet.