Deserialization in Minecraft
CVE-2021-33790
The RebornCore library before 4.7.3 allows remote code execution because it deserializes untrusted data in ObjectInputStream.readObject as part of reborncore.common.network.ExtendedPacketBuffer. An attacker can instantiate any class on the classpath with any data. A class usable for exploitation might or might not be present, depending on what Minecraft modifications are installed.
Vulnerability class: Insecure Deserialization
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.curseforge.com/minecraft/mc-mods/reborncore (Product, Third Party Advisory)
- vuln.ryotak.me/advisories/45 (Third Party Advisory)
- github.com/TechReborn/RebornCore/security/advisories/GHSA-r7pg-4xrf-7mrm (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-33790?
- CVE-2021-33790 is a critical-severity vulnerability in Minecraft, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2021-05-31.
- How severe is CVE-2021-33790?
- Critical severity. CVSS v3 base score is 9.8 out of 10.