CVE-2021-3352Network attack vector

Unauthorized user-data access via improper token handling

Published Aug 13, 2021 · Updated Aug 3, 2024

MiContact Center Business SDK from 8.0.0.0 through 8.1.4.1 and 9.0.0.0 through 9.3.1.0 allows remote attackers to view and modify user data without authorization. The SDK improperly handles access tokens, allowing unauthenticated requests to be accepted for protected user-data operations. Exploitation requires network reachability to the SDK interface; successful attacks affect confidentiality and integrity, with no availability impact reported.

CVSS severity9.1
Critical
EPSS probability1.04%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

MiContact Center Business SDK from 8.0.0.0 through 8.1.4.1 and 9.0.0.0 through 9.3.1.0 allows remote attackers to view and modify user data without authorization. The SDK improperly handles access tokens, allowing unauthenticated requests to be accepted for protected user-data operations. Exploitation requires network reachability to the SDK interface; successful attacks affect confidentiality and integrity, with no availability impact reported.

The record

CVE
CVE-2021-3352
Published
Aug 13, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
6.4NVDAV:N/AC:L/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

T1528Steal Application Access Token

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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