CVE-2021-33790

moderate-risk
Published 2021-05-31

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.

Do I need to act?

~
5.4% chance of exploitation in next 30 days
EPSS score — moderate exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (1)

Reborncore

Affected Vendors

Techreborn

References (6)

Third Party Advisory https://github.com/TechReborn/RebornCore/security/advisories/GHSA-r7pg-4xrf-7mrm
Third Party Advisory https://vuln.ryotak.me/advisories/45
Product https://www.curseforge.com/minecraft/mc-mods/reborncore
Third Party Advisory https://github.com/TechReborn/RebornCore/security/advisories/GHSA-r7pg-4xrf-7mrm
Third Party Advisory https://vuln.ryotak.me/advisories/45
Product https://www.curseforge.com/minecraft/mc-mods/reborncore
45
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 8/34 · Low
Exposure 5/34 · Minimal