CVE-2021-32276

Exp

An issue was discovered in faad2 through 2.10.0. A NULL pointer dereference exists in the function get_sample() located in output.c. It allows an attacker to cause Denial of Service.

Published: 2021-09-20 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-32276 is rated Exploit Available (50/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.13%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2021-32276

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2021-32276

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 0.32% 0.13% -0.19%
2 2025-11-18 0.12% 0.32% +0.20%
3 2025-03-30 — 0.12% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-32276

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2021-32276

OS Trackers for CVE-2021-32276

vendor priority summary link
alpine medium CVE-2021-32276: 1 source package rows (faad2); 12 state rows across 8 repos (3.11-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 5. https://security.alpinelinux.org/vuln/CVE-2021-32276
debian not yet assigned CVE-2021-32276 not yet assigned priority: Debian including 1 source packages (faad2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2021-32276
ubuntu medium CVE-2021-32276 medium priority: Ubuntu including 3 source packages (faad2, welle.io, xine-lib), 45 status rows across 15 suites (bionic, focal, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 15, ignored 12, needs-triage 7, not-affected 7, released 4. https://ubuntu.com/security/CVE-2021-32276

Affected software / configurations for CVE-2021-32276

Vendor Product Version Raw CPE
faad2_project faad2 <= 2.10.0 cpe:2.3:a:faad2_project:faad2:*:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

References for CVE-2021-32276

URL Tags
https://github.com/knik0/faad2/issues/58 Exploit Issue Tracking Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00020.html Mailing List Third Party Advisory
https://www.debian.org/security/2022/dsa-5109 Third Party Advisory
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