HOMEVULNERABILITIESCVE-2020-36632
CRITICAL

CVE-2020-36632

CWE-1321Published: December 25, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A vulnerability, which was classified as critical, was found in hughsk flat up to 5.0.0. This affects the function unflatten of the file index.js. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). It is possible to initiate the attack remotely. Upgrading to version 5.0.1 is able to address this issue. The name of the patch is 20ef0ef55dfa028caddaedbcb33efbdb04d18e13. It is recommended to upgrade the affected component. The identifier VDB-216777 was assigned to this vulnerability.

NVD Source

Risk Analysis

This vulnerability allows for prototype pollution in the flat component, which can be triggered remotely. Given its critical CVSS score of 9.8, it poses a significant risk to application integrity and availability.

There is no known public exploit for this vulnerability, and it is not listed in the CISA KEV catalog.

Recommended Action

Upgrade the flat component to version 5.0.1 to resolve the issue.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2020-36632 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 complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

flat_project1 product(s)
flat
Source: NVD CPE · 1 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/hughsk/flat/commit/20ef0ef55dfa028caddaedbcb33efbdb04d18e13
PATCHhttps://github.com/hughsk/flat/pull/106
PATCHhttps://github.com/hughsk/flat/commit/20ef0ef55dfa028caddaedbcb33efbdb04d18e13
PATCHhttps://github.com/hughsk/flat/pull/106
ADVISORYhttps://github.com/hughsk/flat/issues/105
ADVISORYhttps://github.com/hughsk/flat/releases/tag/5.0.1
ADVISORYhttps://vuldb.com/?ctiid.216777
ADVISORYhttps://vuldb.com/?id.216777
ADVISORYhttps://github.com/hughsk/flat/issues/105
ADVISORYhttps://github.com/hughsk/flat/releases/tag/5.0.1
ADVISORYhttps://vuldb.com/?ctiid.216777
ADVISORYhttps://vuldb.com/?id.216777

All References (12)

→
https://github.com/hughsk/flat/commit/20ef0ef55dfa028caddaedbcb33efbdb04d18e13Patch · Third Party Advisory
→
https://github.com/hughsk/flat/issues/105Issue Tracking · Third Party Advisory
→
https://github.com/hughsk/flat/pull/106Patch · Third Party Advisory
→
https://github.com/hughsk/flat/releases/tag/5.0.1Release Notes · Third Party Advisory
→
https://vuldb.com/?ctiid.216777Third Party Advisory
→
https://vuldb.com/?id.216777Third Party Advisory
→
https://github.com/hughsk/flat/commit/20ef0ef55dfa028caddaedbcb33efbdb04d18e13Patch · Third Party Advisory
→
https://github.com/hughsk/flat/issues/105Issue Tracking · Third Party Advisory
→
https://github.com/hughsk/flat/pull/106Patch · Third Party Advisory
→
https://github.com/hughsk/flat/releases/tag/5.0.1Release Notes · Third Party Advisory
→
https://vuldb.com/?ctiid.216777Third Party Advisory
→
https://vuldb.com/?id.216777Third Party Advisory

Quick Facts

CVE IDCVE-2020-36632
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-1321
CISA KEVNo
Affected1 vendor(s)
PublishedDec 25, 2022

Related CVEs (CWE-1321)

CVE-2023-26121
10.0
CVE-2026-25150
10.0
CVE-2021-23449
10.0
CVE-2026-25881
10.0
CVE-2021-23594
10.0
CVE-2024-38999
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-36632 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.
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