CVE-2021-30481
CRITICALCVSS 9/10EPSS 3.50%
Last modified
CVE-2021-30481 is a critical-severity vulnerability rated 9/10 on the CVSS scale. Valve Steam before 2021-04-17, 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.. EPSS estimates a 3.50% chance of exploitation in the next 30 days.
Description
Valve Steam before 2021-04-17, 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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Valvesoftware | Steam Client | <= 2021-04-10 |
References
- https://news.ycombinator.com/item?id=26762170Issue Tracking, Third Party Advisory
- https://twitter.com/floesen_/status/1337107178096881666Third Party Advisory
- https://twitter.com/the_secret_club/status/1380868759129296900Exploit, Third Party Advisory
- https://www.youtube.com/watch?v=rNQn--9xR1QExploit, Third Party Advisory
- https://news.ycombinator.com/item?id=26762170Issue Tracking, Third Party Advisory
- https://twitter.com/floesen_/status/1337107178096881666Third Party Advisory
- https://twitter.com/the_secret_club/status/1380868759129296900Exploit, Third Party Advisory
- https://www.youtube.com/watch?v=rNQn--9xR1QExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-30481?
Valve Steam before 2021-04-17, 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.
How severe is CVE-2021-30481?
CVE-2021-30481 has a CVSS score of 9/10 (CRITICAL severity). The EPSS model estimates a 3.50% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30481?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-30481?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST