How severe is CVE-2021-29506?

CVE-2021-29506 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-29506 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-29506?

CVE-2021-29506 affects Graphhopper. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-29506?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-29506 published?

CVE-2021-29506 was published on 2021-05-13 and last updated on 2026-06-17.

CVE-2021-29506

CVE-2021-29506 is a medium-severity vulnerability in Graphhopper with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (69th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Graphhopper
Published: 2021-05-13
Last modified: 2026-06-17

Description

GraphHopper is an open-source Java routing engine. In GrassHopper from version 2.0 and before version 2.4, there is a regular expression injection vulnerability that may lead to Denial of Service. This has been patched in 2.4 and 3.0 See this pull request for the fix: https://github.com/graphhopper/graphhopper/pull/2304

Frequently asked questions

What is CVE-2021-29506?: GraphHopper is an open-source Java routing engine. In GrassHopper from version 2.0 and before version 2.4, there is a regular expression injection vulnerability that may lead to Denial of Service. This has been patched in 2.4 and 3.0 See this pull request for the fix: https://github.com/graphhopper/graphhopper/pull/2304
How severe is CVE-2021-29506?: CVE-2021-29506 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-29506 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (69th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-29506?: CVE-2021-29506 affects Graphhopper. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-29506?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-29506 published?: CVE-2021-29506 was published on 2021-05-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:graphhopper:graphhopper:*:*:*:*:*:*:*:*

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