CVE-2021-33806

Name: CVE-2021-33806
Creator: NVD / NIST
Published: 2021-06-03T12:15:07.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.98%

Last modified Jun 17, 2026

CVE-2021-33806 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 2.98% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.98%

85.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-502

Affected Software

Vendor	Product	Versions
Bdew	Bdlib	< 1.16.1.7

References

https://bdew.netRelease Notes, Vendor Advisory
https://github.com/bdew-minecraft/bdlib/commit/447210530ceec72fb3374efecb0930ed359d2297Patch, Third Party Advisory
https://vuln.ryotak.me/advisories/46Third Party Advisory
https://www.curseforge.com/minecraft/mc-mods/bdlib/files/3331330Product, Third Party Advisory
https://bdew.netRelease Notes, Vendor Advisory
https://github.com/bdew-minecraft/bdlib/commit/447210530ceec72fb3374efecb0930ed359d2297Patch, Third Party Advisory
https://vuln.ryotak.me/advisories/46Third Party Advisory
https://www.curseforge.com/minecraft/mc-mods/bdlib/files/3331330Product, Third Party Advisory

Timeline

Published: Jun 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33806?

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 severe is CVE-2021-33806?

CVE-2021-33806 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.98% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33806?

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.

Are you affected by CVE-2021-33806?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST