HOMEVULNERABILITIESCVE-2020-36533
CRITICAL

CVE-2020-36533

CWE-287Published: June 7, 2022· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

A vulnerability was found in Klapp App and classified as problematic. This issue affects some unknown processing of the JSON Web Token Handler. The manipulation leads to weak authentication. The attack may be initiated remotely.

NVD Source

Technical Analysis

CVE-2020-36533 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.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

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

klapp1 product(s)
app
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

ADVISORYhttps://vuldb.com/?id.160763
ADVISORYhttps://www.modzero.com/modlog/archives/2020/09/07/knapp_daneben_ist_auch_vorbei/index.html
ADVISORYhttps://vuldb.com/?id.160763
ADVISORYhttps://www.modzero.com/modlog/archives/2020/09/07/knapp_daneben_ist_auch_vorbei/index.html

All References (4)

→
https://vuldb.com/?id.160763Third Party Advisory · VDB Entry
→
https://www.modzero.com/modlog/archives/2020/09/07/knapp_daneben_ist_auch_vorbei/index.htmlExploit · Third Party Advisory
→
https://vuldb.com/?id.160763Third Party Advisory · VDB Entry
→
https://www.modzero.com/modlog/archives/2020/09/07/knapp_daneben_ist_auch_vorbei/index.htmlExploit · Third Party Advisory

Quick Facts

CVE IDCVE-2020-36533
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-287
CISA KEVNo
Affected1 vendor(s)
PublishedJun 7, 2022

Related CVEs (CWE-287)

CVE-2025-44005
10.0
CVE-2011-4051
10.0
CVE-2026-56191
10.0
CVE-2011-1519
10.0
CVE-2013-1080
10.0
CVE-2026-41070
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-36533 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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