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Fencer Vulns
medium 5.4

CVE-2021-23408 json

Prototype Pollution

published 2021-07-21 5 y ago modified 2026-07-08 4 mo ago also GHSA-qhxh-9hhx-6p7v , EUVD-2021-1845

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

This affects the package com.graphhopper:graphhopper-web-bundle before 3.2, from 4.0-pre1 and before 4.0. The URL parser could be tricked into adding or modifying properties of Object.prototype using a constructor or __proto__ payload.

Patch / fix

  • maven com.graphhopper:graphhopper-web-bundle 3.2
  • n/a com.graphhopper:graphhopper-web-bundle 3.2, 4.0

Exploit prediction

1.40% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JAVA-COMGRAPHHOPPER-1320114 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
NVD 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

Affected packages

ecosystem package affected fixed in
maven com.graphhopper:graphhopper-web-bundle
<3.2
3.2

Affected products

  • n/a com.graphhopper:graphhopper-web-bundle

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.