PatchTheCVECVE-2021-33806: The BDew BdLib library before 1.16.1.7 for Minecraft allows remote code execution because it deserializes untr
CVE-2021-33806 is a critical-severity flaw (CVSS 9.8) affecting bdlib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The BDew BdLib library before 1.16.1.7 for Minecraft allows remote code execution because it deserializes untrusted data in ObjectInputStream.readObject as part of its use of Java serialization.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.0% (top 13%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2021-06-03 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-33806?
bdlib: upgrade to 1.16.1.7. Exact commands for each OS are on this page.
Is CVE-2021-33806 being exploited?
CVE-2021-33806 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-33806 affect?
CVE-2021-33806 affects bdlib. Severity is critical (CVSS 9.8). The BDew BdLib library before 1.16.1.7 for Minecraft allows remote code execution because it deserializes untrusted data in ObjectInputStream.readObject as part of its use of Java serialization.
How urgent is CVE-2021-33806?
Priority 61/100. Critical severity; Remotely exploitable, no login, no user action