VDB-170379 · CVE-2021-21974 · VMSA-2021-0002

VMware ESXi OpenSLP heap-based overflow

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.
8.8	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in VMware ESXi. Affected by this vulnerability is an unknown functionality of the component OpenSLP. Performing a manipulation results in heap-based overflow. This vulnerability is cataloged as CVE-2021-21974. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as critical has been found in VMware ESXi (Virtualization Software) (version now known). This affects some unknown processing of the component OpenSLP. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability.

The weakness was shared 02/25/2021 as VMSA-2021-0002. It is possible to read the advisory at zerodayinitiative.com. This vulnerability is uniquely identified as CVE-2021-21974. Access to the local network is required for this attack to succeed. No form of authentication is needed for exploitation. Technical details are unknown but a public exploit is available.

The exploit is shared for download at packetstormsecurity.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k.

Applying a patch is able to eliminate this problem.

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

Productinfo

Type

Virtualization Software

Vendor

VMware

Name

ESXi

License

commercial

Website

Vendor: https://www.vmware.com/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.8

VulDB Base Score: 9.8
VulDB Temp Score: 8.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (VMware): 8.8
Vendor Vector (VMware): 🔍

Researcher Base Score: 8.8
Researcher Vector: 🔍

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
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Workaround: kb.vmware.com

Timelineinfo

01/04/2021 🔍
02/25/2021 +52 days 🔍
02/25/2021 +0 days 🔍
07/03/2024 +1224 days 🔍

Sourcesinfo

Vendor: vmware.com

Advisory: VMSA-2021-0002
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-21974 (🔍)
GCVE (CVE): GCVE-0-2021-21974
GCVE (VulDB): GCVE-100-170379
scip Labs: https://www.scip.ch/en/?labs.20060413

Entryinfo

Created: 02/25/2021 06:45
Updated: 07/03/2024 19:29
Changes: 02/25/2021 06:45 (37), 03/05/2021 00:43 (5), 02/09/2023 08:34 (40), 07/03/2024 19:29 (21)
Complete: 🔍
Cache ID: 216:9F3:103