VDB-188921 · CVE-2021-40394 · TALOS-2021-1404

Gerbv 2.7.0 RS-274X Aperture Macro Variable out-of-bounds write

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.
6.1	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Gerbv 2.7.0. It has been classified as critical. The impacted element is an unknown function of the component RS-274X Aperture Macro Variable Handler. The manipulation leads to out-of-bounds write. This vulnerability is documented as CVE-2021-40394. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Gerbv 2.7.0. This issue affects an unknown code block of the component RS-274X Aperture Macro Variable Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability.

The weakness was released 12/22/2021 as TALOS-2021-1404. The advisory is shared at talosintelligence.com. The identification of this vulnerability is CVE-2021-40394 since 09/01/2021. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 259372 (Linux Distros Unpatched Vulnerability : CVE-2021-40394), 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 (259372). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Gerbv

Version

2.7.0

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.1

VulDB Base Score: 6.3
VulDB Temp Score: 6.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

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

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 259372
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-40394

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

09/01/2021 🔍
12/22/2021 +112 days 🔍
12/22/2021 +0 days 🔍
08/31/2025 +1348 days 🔍

Sourcesinfo

Advisory: TALOS-2021-1404
Status: Not defined

CVE: CVE-2021-40394 (🔍)
GCVE (CVE): GCVE-0-2021-40394
GCVE (VulDB): GCVE-100-188921

Entryinfo

Created: 12/22/2021 22:25
Updated: 08/31/2025 11:30
Changes: 12/22/2021 22:25 (37), 12/26/2021 08:15 (1), 08/31/2025 11:30 (16)
Complete: 🔍
Cache ID: 216::103

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