CVE-2021-41829Public exploitNetwork attack vector

Backup decryption via build-derived encryption key

Published Sep 30, 2021 · Updated Aug 4, 2024

Cryptographic key weakness in Zoho ManageEngine Remote Access Plus before 10.1.2121.1 allows attackers to decrypt stolen backups. The DCBackupRestore JAR derives the backup-encryption credential from the application build number, producing the same predictable value for every installation of a build. Exploitation requires an encrypted backup and exposes its database, server configuration, enterprise system details, user data, and patch-status information.

CVSS severity7.5
High
EPSS probability3.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cryptographic key weakness in Zoho ManageEngine Remote Access Plus before 10.1.2121.1 allows attackers to decrypt stolen backups. The DCBackupRestore JAR derives the backup-encryption credential from the application build number, producing the same predictable value for every installation of a build. Exploitation requires an encrypted backup and exposes its database, server configuration, enterprise system details, user data, and patch-status information.

The record

CVE
CVE-2021-41829
Published
Sep 30, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-330, T1140
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 30, 2021CVE 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/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 exploitPublished

Weakness, pattern, technique

CWE-330Use of Insufficiently Random Values
T1140Deobfuscate/Decode Files

Public exploit references

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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