HOMEVULNERABILITIESCVE-2018-1000656
HIGH

CVE-2018-1000656

CWE-20Published: August 20, 2018· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

The Pallets Project flask version Before 0.12.3 contains a CWE-20: Improper Input Validation vulnerability in flask that can result in Large amount of memory usage possibly leading to denial of service. This attack appear to be exploitable via Attacker provides JSON data in incorrect encoding. This vulnerability appears to have been fixed in 0.12.3. NOTE: this may overlap CVE-2019-1010083.

NVD Source

Technical Analysis

CVE-2018-1000656 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

netapp3 product(s)
active iqhyper converged infrastructureontap select deploy utility
palletsprojects1 product(s)
flask
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/pallets/flask/pull/2691
PATCHhttps://security.netapp.com/advisory/ntap-20190221-0001/
PATCHhttps://github.com/pallets/flask/pull/2691
PATCHhttps://security.netapp.com/advisory/ntap-20190221-0001/
ADVISORYhttps://github.com/pallets/flask/releases/tag/0.12.3
ADVISORYhttps://github.com/pallets/flask/releases/tag/0.12.3

All References (10)

→
https://github.com/pallets/flask/pull/2691Issue Tracking · Patch · Third Party Advisory
→
https://github.com/pallets/flask/releases/tag/0.12.3Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/08/msg00025.html
→
https://security.netapp.com/advisory/ntap-20190221-0001/Patch · Third Party Advisory
→
https://usn.ubuntu.com/4378-1/
→
https://github.com/pallets/flask/pull/2691Issue Tracking · Patch · Third Party Advisory
→
https://github.com/pallets/flask/releases/tag/0.12.3Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/08/msg00025.html
→
https://security.netapp.com/advisory/ntap-20190221-0001/Patch · Third Party Advisory
→
https://usn.ubuntu.com/4378-1/

Quick Facts

CVE IDCVE-2018-1000656
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-20
CISA KEVNo
Affected2 vendor(s)
PublishedAug 20, 2018

Related CVEs (CWE-20)

CVE-2025-34060
10.0
CVE-2003-1425
10.0
CVE-2024-22476
10.0
CVE-2025-23202
10.0
CVE-2023-41917
10.0
CVE-2007-6176
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2018-1000656 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2018-1000656·NVD