VDB-207067 · CVE-2021-3839 · Nessus 276164

DPDK vhost Library vhost_user_set_inflight_fd 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.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability was found in DPDK. It has been rated as critical. This vulnerability affects the function vhost_user_set_inflight_fd of the component vhost Library. This manipulation causes out-of-bounds write. This vulnerability is tracked as CVE-2021-3839. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability has been found in DPDK (version unknown) and classified as problematic. Affected by this vulnerability is the function vhost_user_set_inflight_fd of the component vhost Library. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is:

A flaw was found in the vhost library in DPDK. Function vhost_user_set_inflight_fd() does not validate `msg->payload.inflight.num_queues`, possibly causing out-of-bounds memory read/write. Any software using DPDK vhost library may crash as a result of this vulnerability.

The weakness was disclosed 08/24/2022 as 6442c329b9d2ded0f44b27d2016aaba8ba5844c5. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-3839 since 09/29/2021. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 276164 (TencentOS Server 4: dpdk (TSSA-2025:0071)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 6442c329b9d2ded0f44b27d2016aaba8ba5844c5 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (276164). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

DPDK

License

open-source

Website

Product: https://github.com/DPDK/dpdk/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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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
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Nessus ID: 276164
Nessus Name: TencentOS Server 4: dpdk (TSSA-2025:0071)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 6442c329b9d2ded0f44b27d2016aaba8ba5844c5

Timelineinfo

09/29/2021 🔍
08/24/2022 +329 days 🔍
08/24/2022 +0 days 🔍
11/24/2025 +1188 days 🔍

Sourcesinfo

Product: github.com

Advisory: 6442c329b9d2ded0f44b27d2016aaba8ba5844c5
Status: Confirmed

CVE: CVE-2021-3839 (🔍)
GCVE (CVE): GCVE-0-2021-3839
GCVE (VulDB): GCVE-100-207067

Entryinfo

Created: 08/24/2022 09:31
Updated: 11/24/2025 07:46
Changes: 08/24/2022 09:31 (41), 09/25/2022 09:39 (11), 11/24/2025 07:46 (16)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.