9.0
CRITICAL
CVE-2021-30481
Steam Vulnerability: Buffer Overflow in Source Engine Game Installation
Description

Valve Steam through 2021-04-10, when a Source engine game is installed, allows remote authenticated users to execute arbitrary code because of a buffer overflow that occurs for a Steam invite after one click.

INFO

Published Date :

April 10, 2021, 7:15 p.m.

Last Modified :

Nov. 21, 2024, 6:04 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

6.0

Exploitability Score :

2.3
Public PoC/Exploit Available at Github

CVE-2021-30481 has a 8 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-2021-30481 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 Valvesoftware steam_client
1 Valve steam
: Total Affected Vendor : 2 | Products : 2
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-2021-30481.

URL Resource
https://news.ycombinator.com/item?id=26762170 Issue Tracking Third Party Advisory
https://twitter.com/floesen_/status/1337107178096881666 Third Party Advisory
https://twitter.com/the_secret_club/status/1380868759129296900 Exploit Third Party Advisory
https://www.youtube.com/watch?v=rNQn--9xR1Q Exploit Third Party Advisory
https://news.ycombinator.com/item?id=26762170 Issue Tracking Third Party Advisory
https://twitter.com/floesen_/status/1337107178096881666 Third Party Advisory
https://twitter.com/the_secret_club/status/1380868759129296900 Exploit Third Party Advisory
https://www.youtube.com/watch?v=rNQn--9xR1Q Exploit Third Party Advisory

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
JHVIW/jhviw.github.io

Combination of all kinds of projects I have hosted via github.io

cheats counter-strike-2 cs2 research-paper research-project

HTML JavaScript CSS Python

Updated: 1 day ago
0 stars 0 fork 0 watcher
Born at : May 31, 2024, 9:43 a.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: 2 months 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: 1 month, 2 weeks 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
MBRzealand/CVSS

CVSS - Sårbarhed i metermål

Updated: 1 year, 11 months ago
0 stars 0 fork 0 watcher
Born at : Sept. 1, 2023, 9:12 a.m. This repo has been linked 1 different CVEs too.
Profile Photo
WhooAmii/POC_to_review

None

Updated: 2 months, 2 weeks ago
2 stars 2 fork 2 watcher
Born at : Nov. 25, 2022, 5:43 p.m. This repo has been linked 935 different CVEs too.
Profile Photo
soosmile/POC

None

Updated: 4 months, 1 week ago
9 stars 1 fork 1 watcher
Born at : June 21, 2022, 7:45 a.m. This repo has been linked 944 different CVEs too.
Profile Photo
tzwlhack/Vulnerability

None

Updated: 2 weeks, 3 days ago
85 stars 19 fork 19 watcher
Born at : Oct. 13, 2021, 4:56 a.m. This repo has been linked 175 different CVEs too.
Profile Photo
floesen/CVE-2021-30481

https://nvd.nist.gov/vuln/detail/CVE-2021-30481

Python Assembly

Updated: 5 months, 1 week ago
55 stars 8 fork 8 watcher
Born at : April 17, 2021, 1:29 a.m. This repo has been linked 1 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-2021-30481 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-30481 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 https://news.ycombinator.com/item?id=26762170
    Added Reference https://twitter.com/floesen_/status/1337107178096881666
    Added Reference https://twitter.com/the_secret_club/status/1380868759129296900
    Added Reference https://www.youtube.com/watch?v=rNQn--9xR1Q
  • CVE Modified by [email protected]

    May. 14, 2024

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

    Feb. 07, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:valvesoftware:steam:*:*:*:*:*:*:*:* versions from (including) 2021-04-10 OR *cpe:2.3:a:valvesoftware:steam_client:*:*:*:*:*:*:*:* versions from (including) 2021-04-10
  • Initial Analysis by [email protected]

    Apr. 21, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:S/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
    Changed Reference Type https://news.ycombinator.com/item?id=26762170 No Types Assigned https://news.ycombinator.com/item?id=26762170 Issue Tracking, Third Party Advisory
    Changed Reference Type https://twitter.com/floesen_/status/1337107178096881666 No Types Assigned https://twitter.com/floesen_/status/1337107178096881666 Third Party Advisory
    Changed Reference Type https://twitter.com/the_secret_club/status/1380868759129296900 No Types Assigned https://twitter.com/the_secret_club/status/1380868759129296900 Exploit, Third Party Advisory
    Changed Reference Type https://www.youtube.com/watch?v=rNQn--9xR1Q No Types Assigned https://www.youtube.com/watch?v=rNQn--9xR1Q Exploit, Third Party Advisory
    Added CWE NIST CWE-120
    Added CPE Configuration OR *cpe:2.3:a:valvesoftware:steam:*:*:*:*:*:*:*:* versions up to (including) 2021-04-10
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-2021-30481 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-2021-30481 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-92: Forced Integer Overflow Forced Integer Overflow CAPEC-100: Overflow Buffers Overflow Buffers
Exploit Prediction

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

10.98 }} -0.32%

score

0.93089

percentile

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