CVE-2021-20833Network attack vector

Communication interception via improper certificate validation

Published Oct 13, 2021 · Updated Aug 3, 2024

Improper certificate validation in SNKRDUNK TCG & Sneakers App before 2.2.0 allows man-in-the-middle attackers to read or alter TLS traffic. The iOS client's TLS handling accepts a crafted server certificate without properly authenticating the server, exposing specific encrypted exchanges to interception and modification. An attacker must control the network path, such as through a malicious Wi-Fi access point; the documented impact is limited to communication confidentiality and integrity.

CVSS severity4.8
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in SNKRDUNK TCG & Sneakers App before 2.2.0 allows man-in-the-middle attackers to read or alter TLS traffic. The iOS client's TLS handling accepts a crafted server certificate without properly authenticating the server, exposing specific encrypted exchanges to interception and modification. An attacker must control the network path, such as through a malicious Wi-Fi access point; the documented impact is limited to communication confidentiality and integrity.

The record

CVE
CVE-2021-20833
Published
Oct 13, 2021
Updated
Aug 3, 2024
Vendor
SODA, Inc.
Product
SNKRDUNK TCG & Sneakers App
Classifications
CWE-295, CAPEC-459, CAPEC-475, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=versions prior to 2.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SODA, Inc. · SNKRDUNK TCG & Sneakers Appversion=versions prior to 2.2.0

Published CVSS scores

4.8JPCERT/CCCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0JPCERT/CCAV:N/AC:H/Au:N/C:P/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
CAPEC-459Creating a Rogue Certification Authority Certificate
CAPEC-475Signature Spoofing by Improper Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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