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8.8
HIGH CVSS 3.1
CVE-2021-21974
VMware ESXi OpenSLP Remote Code Execution Heap Overflow
Description

OpenSLP as used in ESXi (7.0 before ESXi70U1c-17325551, 6.7 before ESXi670-202102401-SG, 6.5 before ESXi650-202102101-SG) has a heap-overflow vulnerability. A malicious actor residing within the same network segment as ESXi who has access to port 427 may be able to trigger the heap-overflow issue in OpenSLP service resulting in remote code execution.

INFO

Published Date :

Feb. 24, 2021, 5:15 p.m.

Last Modified :

Nov. 21, 2024, 5:49 a.m.

Remotely Exploit :

No

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-21974 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Vmware esxi
2 Vmware cloud_foundation
: Total Affected Vendor : 1 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
Solution
This information is provided by the 3rd party feeds.
  • Apply the appropriate patch as referenced in the vendor advisory.
Public PoC/Exploit Available at Github

CVE-2021-21974 has a 25 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-21974.

URL Resource
http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html Exploit Third Party Advisory VDB Entry
https://www.vmware.com/security/advisories/VMSA-2021-0002.html Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-250/ Third Party Advisory VDB Entry
http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html Exploit Third Party Advisory VDB Entry
https://www.vmware.com/security/advisories/VMSA-2021-0002.html Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-250/ Third Party Advisory VDB Entry
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-21974 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-21974 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
RicheByte/forensicEngine

Forensics and Post-Ex: Coverin' Tracks and Diggin' Deep After the breach what next?

Python Shell

Updated: 1 week, 1 day ago
2 stars 0 fork 0 watcher
Born at : Oct. 12, 2025, 4:34 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
P3gEcTH8uJiYFVKb7lIn/awesome-list

Forked from https://github.com/0xor0ne/awesome-list.git

Updated: 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Oct. 10, 2025, 9:01 a.m. This repo has been linked 102 different CVEs too.
Profile Photo
kolaarionvull/awesome-list

Forked from https://github.com/0xor0ne/awesome-list.git

Updated: 2 weeks, 6 days ago
1 stars 0 fork 0 watcher
Born at : Oct. 6, 2025, 2:32 p.m. This repo has been linked 102 different CVEs too.
Profile Photo
abirasecurity/CVE-2021-21974_vuln_dectection

CVE-2021-21974 Vulnerability Detection Tool Safe PoC that identifies vulnerable SLP implementations without exploitation

Python

Updated: 1 month, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Sept. 4, 2025, 5:29 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
zhanpengliu-tencent/medium-cve

None

Updated: 2 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Aug. 15, 2025, 9:07 a.m. This repo has been linked 310 different CVEs too.
Profile Photo
Jalexander798/JA_Tools-Cybersecurity-Resource-2

None

Updated: 3 months ago
0 stars 0 fork 0 watcher
Born at : July 25, 2025, 7:02 p.m. This repo has been linked 96 different CVEs too.
Profile Photo
bachkhoasoft/awesome-list-ks

None

Updated: 4 months ago
0 stars 0 fork 0 watcher
Born at : June 29, 2025, 6:30 a.m. This repo has been linked 94 different CVEs too.
Profile Photo
cc8700619/poc

None

Updated: 4 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : June 10, 2025, 6:57 a.m. This repo has been linked 105 different CVEs too.
Profile Photo
mercylessghost/CVE-2021-21974

None

Python

Updated: 9 months, 2 weeks ago
0 stars 0 fork 0 watcher
Born at : Jan. 10, 2025, 6 p.m. This repo has been linked 1 different CVEs too.
Profile Photo
NaInSec/CVE-PoC-in-GitHub

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 4 months, 4 weeks ago
12 stars 3 fork 3 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 931 different CVEs too.
Profile Photo
zecool/cve

None

Updated: 4 months, 1 week ago
2 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 935 different CVEs too.
Profile Photo
hateme021202/cve-2021-21974

Nmap NSE script for cve-2021-21974

Lua

Updated: 2 years ago
0 stars 0 fork 0 watcher
Born at : Oct. 19, 2023, 2:03 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
whoforget/CVE-POC

None

Updated: 2 years, 7 months ago
0 stars 2 fork 2 watcher
Born at : April 8, 2023, 6:19 a.m. This repo has been linked 928 different CVEs too.
Profile Photo
chosenonehacks/Red-Team-tools-and-usefull-links

None

Updated: 2 years, 7 months ago
0 stars 0 fork 0 watcher
Born at : March 27, 2023, 6:53 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
k0mi-tg/CVE-POC

None

Updated: 1 year, 8 months ago
20 stars 3 fork 3 watcher
Born at : Feb. 14, 2023, 6:10 p.m. This repo has been linked 921 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-21974 vulnerability anywhere in the article.

  • cloudsecurityalliance.org
ESXi Ransomware: The Growing Threat to Virtualized Environments

Originally published by ValiCyber. Written by Nathan Montierth. Ransomware has reshaped the cybersecurity landscape, and a disturbing new trend is emerging: the targeting of ESXi environments. As the ... Read more

Published Date: Jun 23, 2025 (4 months, 1 week ago)
  • Dark Reading
Keep Tier-One Applications Out of Virtual Environments

Morey Haber, Chief Security Officer, BeyondTrustSeptember 25, 20245 Min ReadSource: Panther Media via Alamy Stock PhotoCOMMENTARYFor at least the past 20 years, virtual machines and enterprise-ready h ... Read more

Published Date: Sep 25, 2024 (1 year, 1 month ago)
  • Help Net Security
VMware ESXi auth bypass zero-day exploited by ransomware operators (CVE-2024-37085)

Ransomware operators have been leveraging CVE-2024-37085, an authentication bypass vulnerability affecting Active Directory domain-joined VMware ESXi hypervisors, to gain full administrative access to ... Read more

Published Date: Jul 30, 2024 (1 year, 3 months ago)
  • Google Cloud
Ransomware Rebounds: Extortion Threat Surges in 2023, Attackers Rely on Publicly Available and Legitimate Tools

Written by: Bavi Sadayappan, Zach Riddle, Jordan Nuce, Joshua Shilko, Jeremy Kennelly A version of this blog post was published to the Mandiant Advantage portal on April 18, 2024. Executive Summary In ... Read more

Published Date: Jun 03, 2024 (1 year, 4 months ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-21974 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html
    Added Reference https://www.vmware.com/security/advisories/VMSA-2021-0002.html
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-250/
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CPE Deprecation Remap by [email protected]

    Jun. 02, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:vmware:esxi:7.0.0:u1:*:*:*:*:*:* OR *cpe:2.3:o:vmware:esxi:7.0.0:update_1:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Jun. 02, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:vmware:esxi:7.0.0:u1a:*:*:*:*:*:* OR *cpe:2.3:o:vmware:esxi:7.0.0:update_1a:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Jun. 02, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:vmware:esxi:7.0.0:u1b:*:*:*:*:*:* OR *cpe:2.3:o:vmware:esxi:7.0.0:update_1b:*:*:*:*:*:*
  • Modified Analysis by [email protected]

    May. 27, 2022

    Action Type Old Value New Value
    Changed Reference Type http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html No Types Assigned http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html Exploit, Third Party Advisory, VDB Entry
  • CVE Modified by [email protected]

    Jun. 03, 2021

    Action Type Old Value New Value
    Added Reference http://packetstormsecurity.com/files/162957/VMware-ESXi-OpenSLP-Heap-Overflow.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Mar. 04, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.vmware.com/security/advisories/VMSA-2021-0002.html No Types Assigned https://www.vmware.com/security/advisories/VMSA-2021-0002.html Vendor Advisory
    Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-250/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-250/ Third Party Advisory, VDB Entry
    Added CWE NIST CWE-787
    Added CPE Configuration OR *cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 3.0 up to (excluding) 3.10.1.2 *cpe:2.3:a:vmware:cloud_foundation:*:*:*:*:*:*:*:* versions from (including) 4.0 up to (excluding) 4.2
    Added CPE Configuration OR *cpe:2.3:o:vmware:esxi:6.5:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:2:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201701001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201703001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201703002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201704001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707101:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707102:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707103:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707201:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707202:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707203:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707204:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707205:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707206:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707207:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707208:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707209:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707210:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707211:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707212:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707213:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707214:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707215:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707216:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707217:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707218:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707219:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707220:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201707221:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201710001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201712001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201803001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201806001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201808001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201810001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201810002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201811001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201811002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201811301:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201901001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201903001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201905001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201908001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201910001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-20191004001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201911001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201911401:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201911402:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912101:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912102:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912103:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912104:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912301:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912401:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912402:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912403:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-201912404:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202005001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202006001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202007001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202010001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202011001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202011002:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.5:650-202102001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:-:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201806001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201807001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201808001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810101:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810102:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810103:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810201:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810202:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810203:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810204:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810205:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810206:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810207:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810208:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810209:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810210:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810211:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810212:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810213:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810214:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810215:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810216:*:*:*:*:*:* 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  • CVE Modified by [email protected]

    Feb. 24, 2021

    Action Type Old Value New Value
    Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-250/ [No Types Assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 8.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 5.8
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

48.35 }} -2.30%

score

0.97591

percentile