VDB-207324 · CVE-2021-33844 · Nessus 270546

SoX WAV File wav.c startread divide by zero

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.9	$0-$5k	0.00

Summaryinfo

A vulnerability described as problematic has been identified in SoX. The impacted element is the function startread of the file wav.c of the component WAV File Handler. The manipulation results in divide by zero. This vulnerability is cataloged as CVE-2021-33844. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in SoX (unknown version). Affected is the function startread of the file wav.c of the component WAV File Handler. The manipulation with an unknown input leads to a divide by zero vulnerability. CWE is classifying the issue as CWE-369. The product divides a value by zero. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was shared 08/26/2022. The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2021-33844 since 06/04/2021. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 270546 (Amazon Linux 2 : sox, --advisory ALAS2-2025-3032 (ALAS-2025-3032)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (270546). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.3
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Divide by zero
CWE: CWE-369 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 270546
Nessus Name: Amazon Linux 2 : sox, --advisory ALAS2-2025-3032 (ALAS-2025-3032)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/04/2021 🔍
08/26/2022 +448 days 🔍
08/26/2022 +0 days 🔍
10/17/2025 +1148 days 🔍

Sourcesinfo

Advisory: access.redhat.com
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-33844 (🔍)
GCVE (CVE): GCVE-0-2021-33844
GCVE (VulDB): GCVE-100-207324

Entryinfo

Created: 08/26/2022 09:23
Updated: 10/17/2025 17:20
Changes: 08/26/2022 09:23 (39), 10/02/2022 07:58 (11), 06/27/2025 21:53 (15), 10/17/2025 17:20 (2)
Complete: 🔍
Cache ID: 216::103