How severe is CVE-2015-9241?

No CVSS score has been assigned to CVE-2015-9241 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2015-9241?

CVE-2015-9241 affects the following packages: hapi (npm). Ecosystems affected: npm.

How do I fix CVE-2015-9241?

Update hapi to 11.1.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-9241 is resolved across your whole dependency graph.

How do I detect CVE-2015-9241 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hapi, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2015-9241 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2015-9241 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2015-9241, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2015-9241?

CVE-2015-9241 has an EPSS (Exploit Prediction Scoring System) score of 2.1%, placing it in the 81th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2015-9241?

CVE-2015-9241 is classified as Uncontrolled Resource Consumption (CWE-400), Improper Input Validation (CWE-20). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2015-9241 published, and has it been updated?

CVE-2015-9241 was published on June 7, 2018 and was last updated on November 8, 2023. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2015-9241 — hapi

Fix: jfhbrook/node-ecstatic#179

CVE-2015-9241 is a Uncontrolled Resource Consumption vulnerability in hapi. 1 public exploit reference exists, so weaponization risk is real. A fix is available for hapi — see the affected versions and patch details below.

Denial of Service in hapi

Published

Jun 7, 2018

Updated

Nov 8, 2023

Affected

1 pkg

Patched

1 / 1

Exploits

1 known

Exploitation data as of Oct 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

2.1%probability of exploitation in next 30 days

Lower Risk-0.03%

Lower risk than most CVEs81th percentile — riskier than 81% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, a proxy for how much of the ecosystem is exposed.

hapinpm

57Kdownloads / week

Description

Versions of hapi prior to 11.1.3 are affected by a denial of service vulnerability.

The vulnerability is triggered when certain input is passed into the If-Modified-Since or Last-Modified headers.

This causes an 'illegal access' exception to be raised, and instead of sending a HTTP 500 error back to the sender, hapi will continue to hold the socket open until timed out (default node timeout is 2 minutes).

Recommendation

Update to v11.1.3 or later

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`hapi`	all versions	11.1.3`npm install hapi@11.1.3`

Affected Products

1 product · 1 configurations

Application

hapihapijs

< 11.1.3

range

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Certain input passed into the If-Modified-Since or Last-Modified headers…

github.comNVDOct 2019

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for hapi, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update hapi to 11.1.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2015-9241 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

Versions of `hapi` prior to 11.1.3 are affected by a denial of service vulnerability. The vulnerability is triggered when certain input is passed into the If-Modified-Since or Last-Modified headers. This causes an 'illegal access' exception to be raised, and instead of sending a HTTP 500 error back to the sender, hapi will continue to hold the socket open until timed out (default node timeout is 2 minutes). ## Recommendation Update to v11.1.3 or later

O3 Security · Impact-Aware SCA

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