CVE-2020-37277

mediumpriority · track · 26EPSS 0.005 · 45 %ileUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.53% (45th) EPSS
CVSS 6.5 · medium
Is it mine?
1 products
Check your exposure
Who says so?
1 sources
osv

EPSS · scored 2026-10-27

PocketMine-MP versions before 3.15.4 contain a denial of service vulnerability in the InventoryTransaction component's findResultItem() method. Malicious clients can send specially crafted InventoryTransactionPackets with multiple conflicting pathways to cause exponential processing complexity, freezing the server.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.1
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.9–7.1

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hprimary · disclosure@vulncheck.comexploitability 2.8 · impact 3.6
v4.07.1highCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · disclosure@vulncheck.com
v4.04.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400US
04

affected products (1)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • GHSA-8jq6-w5cg-wm45Exploitable inventory component chaining in PocketMine-MP2020-11-11ghsa · osvUS

    ### Impact Specially crafted `InventoryTransactionPacket`s sent by malicious clients were able to exploit the behaviour of `InventoryTransaction->findResultItem()` and cause it to take an abnormally long time to execute (causing an apparent server freeze). The affected code is intended to compact conflicting `InventoryActions` which are in the same `InventoryTransaction` by flattening them into a single action. When multiple pathways to a result existed, the complexity of this flattening became exponential. The problem was fixed by bailing when ambiguities are detected. **At the time of writing, this exploit is being used in the wild by attackers to deny service to servers.** ### Patches Upgrade to 3.15.4 or newer. ### Workarounds No practical workarounds are possible, short of backporting the fix or implementing checks in a plugin listening to `DataPacketReceiveEvent`. ### References c368ebb5e74632bc622534b37cd1447b97281e20 ### For more information If you have any questions or comments about this advisory: * Email us at [team@pmmp.io](mailto:team@pmmp.io)

06

sources

Which sources assert this record, and when.

osvNVDCVE.orgMITRE
published 2026-09-06modified 2026-10-08
07

references (3) nvd

External citations — patches, advisories, analysis.

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