CVE-2021-44207Known exploitationPublic exploitNetwork attack vector

Remote code execution via shared ViewState keys

Published Dec 21, 2021 · Updated Oct 21, 2025

Hard-coded credentials in Acclaim USAHERDS 7.4.0.1 and earlier allow remote attackers to execute code through crafted ASP.NET ViewState data. The application reuses static ValidationKey and DecryptionKey values across installations, letting a forged ViewState pass the MAC check and reach server-side deserialization. Exploitation is unauthenticated but requires the shared keys to be obtained through a separate flaw or another channel, and successful exploitation grants code execution on the application server.

CVSS severity8.1
High
EPSS probability17.58%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in Acclaim USAHERDS 7.4.0.1 and earlier allow remote attackers to execute code through crafted ASP.NET ViewState data. The application reuses static ValidationKey and DecryptionKey values across installations, letting a forged ViewState pass the MAC check and reach server-side deserialization. Exploitation is unauthenticated but requires the shared keys to be obtained through a separate flaw or another channel, and successful exploitation grants code execution on the application server.

The record

CVE
CVE-2021-44207
Published
Dec 21, 2021
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-798, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2021Exploitation reportedAPT41 exploitation of USAHERDS
  2. Dec 21, 2021CVE publishedPublication date reported by the CVE source.
  3. Oct 21, 2025Record 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

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
8.1NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1190Exploit Public-Facing Application

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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