CVE-2021-39070Network attack vector

Unauthenticated account impersonation via undisclosed authentication flaw

Published Feb 2, 2022 · Updated Sep 16, 2024

Authentication bypass in IBM Security Verify Access 10.0.0.0, 10.0.1.0, and 10.0.2.0 allows remote attackers to impersonate any user. IBM has not published the affected request handler, validation failure, or credential-processing operation within the Advanced Access Control authentication service. The service must be enabled, but no prior account or user interaction is required; successful exploitation grants access as any system user.

CVSS severity9.8
Critical
EPSS probability1.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in IBM Security Verify Access 10.0.0.0, 10.0.1.0, and 10.0.2.0 allows remote attackers to impersonate any user. IBM has not published the affected request handler, validation failure, or credential-processing operation within the Advanced Access Control authentication service. The service must be enabled, but no prior account or user interaction is required; successful exploitation grants access as any system user.

The record

CVE
CVE-2021-39070
Published
Feb 2, 2022
Updated
Sep 16, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 2, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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

9.8IBM CorporationCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.5IBM CorporationCVSS:3.0/UI:N/PR:N/AC:L/A:H/I:H/AV:N/C:H/S:U/RL:O/RC:C/E:U

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

No sourced classifications are available.

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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