yasm 1.3.0 libyasm/expr.c yasm_expr_get_intnum null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability was found in yasm 1.3.0. It has been rated as problematic. This vulnerability affects the function yasm_expr_get_intnum of the file libyasm/expr.c. Performing a manipulation results in null pointer dereference. This vulnerability is known as CVE-2021-33454. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in yasm 1.3.0. This affects the function yasm_expr_get_intnum of the file libyasm/expr.c. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

An issue was discovered in yasm version 1.3.0. There is a NULL pointer dereference in yasm_expr_get_intnum() in libyasm/expr.c.

The weakness was published 07/26/2022 as 166. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2021-33454 since 05/20/2021. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 256753 (Linux Distros Unpatched Vulnerability : CVE-2021-33454), 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 (256753). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 256753
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-33454

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/20/2021 🔍
07/26/2022 +432 days 🔍
07/26/2022 +0 days 🔍
08/28/2025 +1129 days 🔍

Sourcesinfo

Product: github.com

Advisory: 166
Status: Confirmed

CVE: CVE-2021-33454 (🔍)
GCVE (CVE): GCVE-0-2021-33454
GCVE (VulDB): GCVE-100-205065

Entryinfo

Created: 07/26/2022 18:51
Updated: 08/28/2025 04:00
Changes: 07/26/2022 18:51 (39), 08/27/2022 11:49 (11), 08/28/2025 04:00 (16)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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