8.8
HIGH
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 :

June 2, 2022, 2:41 p.m.

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

2.8
Public PoC/Exploit Available at Github

CVE-2021-21974 has a 15 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

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
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

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).

All CVE - PoC in GitHub

poc proofofconcept tester allcve cvegithub cvenew cvepoc cveupdate

Updated: 2 months, 3 weeks ago
5 stars 2 fork 2 watcher
Born at : March 22, 2024, 3:58 p.m. This repo has been linked 928 different CVEs too.

None

Updated: 8 months, 1 week ago
1 stars 0 fork 0 watcher
Born at : March 11, 2024, 1:21 p.m. This repo has been linked 930 different CVEs too.

Nmap NSE script for cve-2021-21974

Lua

Updated: 1 year, 1 month 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.

None

Updated: 1 year, 7 months ago
0 stars 2 fork 2 watcher
Born at : April 8, 2023, 6:19 a.m. This repo has been linked 923 different CVEs too.

None

Updated: 1 year, 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.

None

Updated: 9 months, 1 week 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.

ESXi EZ - A custom scanner that takes list of IPs either in JSON, CSV or individually and checks for infection CVE-2021-21974

Python

Updated: 11 months, 2 weeks ago
2 stars 0 fork 0 watcher
Born at : Feb. 8, 2023, 10:46 a.m. This repo has been linked 1 different CVEs too.

Analysis of the ransom demands from Shodan results

Shell Python

Updated: 1 year, 9 months ago
2 stars 0 fork 0 watcher
Born at : Feb. 4, 2023, 9:23 p.m. This repo has been linked 1 different CVEs too.

None

Updated: 1 year, 9 months ago
0 stars 0 fork 0 watcher
Born at : Jan. 31, 2023, 3:37 a.m. This repo has been linked 14 different CVEs too.

None

Updated: 9 months ago
2 stars 2 fork 2 watcher
Born at : Nov. 25, 2022, 5:43 p.m. This repo has been linked 930 different CVEs too.

None

Updated: 4 months, 3 weeks ago
8 stars 1 fork 1 watcher
Born at : June 21, 2022, 7:45 a.m. This repo has been linked 943 different CVEs too.

POC集合,框架nday漏洞利用

Updated: 2 months, 2 weeks ago
373 stars 49 fork 49 watcher
Born at : April 4, 2022, 5:54 a.m. This repo has been linked 105 different CVEs too.

POC for CVE-2021-21974 VMWare ESXi RCE Exploit

Python

Updated: 2 months, 3 weeks ago
173 stars 41 fork 41 watcher
Born at : May 25, 2021, 5:14 p.m. This repo has been linked 1 different CVEs too.

Python / scapy module implementing SRVLOC/SLP protocol and scans for enabled OpenSLP services.

cve-2019-5544 cve-2020-3992 slp openslp srvloc cve-2021-21974

Python

Updated: 2 months, 3 weeks ago
45 stars 11 fork 11 watcher
Born at : Dec. 1, 2020, 1:49 p.m. This repo has been linked 3 different CVEs too.

Collection of quality safety articles. Awesome articles.

dns pentest list security sec hacking src bug-bounty fuzz xss research github waf java hacker redteam bounty-hunters web cloud awesome

Updated: 2 months, 1 week ago
2013 stars 464 fork 464 watcher
Born at : Aug. 31, 2017, 1:46 p.m. This repo has been linked 14 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.

  • 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 month, 3 weeks 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 (3 months, 3 weeks 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 (5 months, 2 weeks ago)

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 [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:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810217:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810218:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810219:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810220:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810221:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810222:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810223:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810224:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810225:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810226:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810227:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810228:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810229:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810230:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810231:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810232:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810233:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201810234:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201811001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201901001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201901401:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201901402:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201901403:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201903001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904001:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904201:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904201-ug:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904202:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904202-ug:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904203:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904203-ug:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904204:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904204-ug:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904205:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904205-ug:*:*:*:*:*:* *cpe:2.3:o:vmware:esxi:6.7:670-201904206:*:*:*:*:*:* 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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.
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.

Exploit Prediction

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

93.14 }} 0.28%

score

0.99099

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability