CVE-2021-42791Network attack vector

Kerberos ticket theft via unauthorized push notifications

Published Jan 28, 2022 · Updated Aug 4, 2024

Broken access control in VeridiumAD 2.5.3.0 allows remote authenticated users to obtain another user's Kerberos TGT via a push request. The login push-notification HTTP request accepts any enrolled target and attacker-controlled notification text without enforcing authorization. A valid VeridiumAD account and the target user's acceptance are required; acceptance gives the requester the target user's login ticket.

CVSS severity7.3
High
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Broken access control in VeridiumAD 2.5.3.0 allows remote authenticated users to obtain another user's Kerberos TGT via a push request. The login push-notification HTTP request accepts any enrolled target and attacker-controlled notification text without enforcing authorization. A valid VeridiumAD account and the target user's acceptance are required; acceptance gives the requester the target user's login ticket.

The record

CVE
CVE-2021-42791
Published
Jan 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-444, T1558
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
4.9NIST NVDAV:N/AC:M/Au:S/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
T1558Steal or Forge Kerberos Tickets

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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