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CVE Record

CVE-2021-23408: Prototype Pollution

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.

MediumCVSS 5.4Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-23408 is a prototype pollution flaw in GraphHopper's Java web bundle URL parser. A crafted URL could alter shared object properties in affected versions, creating limited confidentiality or availability risk. The CVSS rating is medium, and the provided sources do not show active exploitation.

Executive priority

Treat as a moderate remediation item. It is not KEV-listed, but internet-facing systems using affected GraphHopper components should be scheduled for upgrade in the next normal security maintenance window.

Technical view

The affected package is com.graphhopper:graphhopper-web-bundle before 3.2, and 4.0-pre1 before 4.0. The URL parser could accept constructor or __proto__ payloads that modify Object.prototype. The CVSS vector indicates network reachability, low attack complexity, no privileges, required user interaction, low confidentiality impact, no integrity impact, and low availability impact.

Likely exposure

Exposure is most likely where an application includes affected graphhopper-web-bundle versions and processes user-controlled or link-controlled URLs through the GraphHopper web interface or related URL parsing code.

Exploitation context

The source bundle marks CISA KEV as false, and no cited source states active exploitation. Risk depends on whether vulnerable URL parsing is reachable by untrusted users or crafted links.

Researcher notes

The evidence supports affected version ranges and vulnerability class, but not real-world exploitation. Avoid assuming remote code execution or data modification beyond the CVSS impacts. Validate reachability of the URL parser before assigning operational urgency.

Mitigation direction

  • Upgrade graphhopper-web-bundle to a non-affected release, such as 3.2 or later.
  • If using 4.0-pre1, move to 4.0 or later.
  • Review Snyk and GraphHopper release guidance before deploying changes.
  • Prioritize externally reachable applications that parse user-supplied URLs.

Validation and detection

  • Inventory Maven or build dependencies for com.graphhopper:graphhopper-web-bundle.
  • Confirm deployed versions are not before 3.2 or 4.0-pre1 before 4.0.
  • Identify routes or UI flows that parse user-controlled GraphHopper URLs.
  • Check dependency scanners for CVE-2021-23408 or SNYK-JAVA-COMGRAPHHOPPER-1320114.
Prepared
Confidence
high
Sources
6

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-23408 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.4 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.4CVSS 3.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L2.82.5Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.4Medium
CVSS 3.1 vector shape for CVE-2021-23408Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/acom.graphhopper:graphhopper-web-bundleunspecified, 4.0-pre1, unspecifiedListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.