CVE-2017-14158 — Scrapy 1.4 allows remote attackers to cause a denial of service (memory consumption) via large files because arbitrarily many files are read into memory, which is especially problematic if the files are then individually written in a separate thread to a slow storage resource, as demonstrated by interaction between dataReceived (in core/downloader/handlers/http11.py) and S3FilesStore

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HIGH

Scrapy 1.4 allows remote attackers to cause a denial of service (memory consumption) via large files because arbitrarily many files are read into memory, which is especially problematic if the files are then individually written in a separate thread to a slow storage resource, as demonstrated by interaction between dataReceived (in core/downloader/handlers/http11.py) and S3FilesStore

Published Sep 5, 2017

7.5

HIGH

CVSS 3.0

EPSS 2.57%

Description

Scrapy 1.4 allows remote attackers to cause a denial of service (memory consumption) via large files because arbitrarily many files are read into memory, which is especially problematic if the files are then individually written in a separate thread to a slow storage resource, as demonstrated by interaction between dataReceived (in core/downloader/handlers/http11.py) and S3FilesStore.

Affected products

Remediation

No remediation recorded yet.

Metrics

2.57% 0.02573

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.02573

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v5

Table of values (13 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	2.57% (0.02573)	84.62th	v5 (v2026.06.15)
Jul 24, 2026	2.66% (0.02655)	84.07th	v5 (v2026.06.15)
Jul 20, 2024	0.24% (0.00235)	62.03th	v3 (v2023.03.01)
Jul 16, 2023	0.24% (0.00235)	60.66th	v3 (v2023.03.01)
Mar 7, 2023	0.22% (0.00218)	57.94th	v3 (v2023.03.01)
Mar 6, 2023	1.05% (0.01055)	52.13th	v2 (v2022.01.01)
Sep 17, 2022	1.05% (0.01055)	50.47th	v2 (v2022.01.01)
Apr 1, 2022	1.05% (0.01055)	48.43th	v2 (v2022.01.01)
Feb 4, 2022	1.05% (0.01055)	27.52th	v2 (v2022.01.01)
Feb 3, 2022	0.98% (0.00976)	26.54th	v1
Jan 6, 2022	0.98% (0.00976)	25.91th	v1
Sep 1, 2021	0.98% (0.00976)	61.78th	v1
Apr 14, 2021	0.98% (0.00976)	0.00th	v1

Weaknesses (1)

CWE-400

Uncontrolled Resource Consumption

References (6)

http://blog.csdn.net/wangtua/article/details/75228728
x_refsource_MISCExploitThird Party Advisory
https://github.com/advisories/GHSA-h7wm-ph43-c39p
Advisory
https://github.com/pypa/advisory-database/blob/8b7a4d62a95e8f605e5dfb4e0b4f299e6403dc12/vulns/scrapy/PYSEC-2017-83.yaml
https://github.com/pypa/advisory-database/tree/main/vulns/scrapy/PYSEC-2017-83.yaml
https://github.com/scrapy/scrapy/issues/482
x_refsource_MISCIssue TrackingThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2017-14158

Link	Providers	Tags
http://blog.csdn.net/wangtua/article/details/75228728		x_refsource_MISCExploitThird Party Advisory
https://github.com/advisories/GHSA-h7wm-ph43-c39p		Advisory
https://github.com/pypa/advisory-database/blob/8b7a4d62a95e8f605e5dfb4e0b4f299e6403dc12/vulns/scrapy/PYSEC-2017-83.yaml
https://github.com/pypa/advisory-database/tree/main/vulns/scrapy/PYSEC-2017-83.yaml
https://github.com/scrapy/scrapy/issues/482		x_refsource_MISCIssue TrackingThird Party Advisory
https://nvd.nist.gov/vuln/detail/CVE-2017-14158