CVE-2021-44677Network attack vector

Remote code execution via unsafe .NET Remoting deserialization

Published Dec 6, 2021 · Updated Aug 4, 2024

Deserialization in Veritas Enterprise Vault 14.1.2 and earlier allows remote authenticated users to execute code via .NET Remoting. The EVExchangeWebServicesProxy service reconstructs objects from attacker-supplied command data received through a dynamically assigned .NET Remoting TCP port. Exploitation requires RDP access through Remote Desktop Users membership, knowledge of runtime connection details, and an improperly configured server firewall.

CVSS severity9.8
Critical
EPSS probability1.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Veritas Enterprise Vault 14.1.2 and earlier allows remote authenticated users to execute code via .NET Remoting. The EVExchangeWebServicesProxy service reconstructs objects from attacker-supplied command data received through a dynamically assigned .NET Remoting TCP port. Exploitation requires RDP access through Remote Desktop Users membership, knowledge of runtime connection details, and an improperly configured server firewall.

The record

CVE
CVE-2021-44677
Published
Dec 6, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 6, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8VeritasCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

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-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

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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