CVE-2021-36981Public exploitNetwork attack vector

Authenticated code execution via unfiltered Java deserialization

Published Aug 31, 2021 · Updated Aug 4, 2024

Unsafe deserialization in SerNet verinice before 1.22.2 allows remote authenticated users to execute arbitrary code on the server. The commandServiceHttpInvoker endpoint passes request bytes to ObjectInputStream.readObject without a class filter, enabling C3P0 gadget execution. Any verinice.PRO account, including a non-admin account, can reach the flaw and execute commands with the server process's rights, exposing files and database data.

CVSS severity8.8
High
EPSS probability6.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in SerNet verinice before 1.22.2 allows remote authenticated users to execute arbitrary code on the server. The commandServiceHttpInvoker endpoint passes request bytes to ObjectInputStream.readObject without a class filter, enabling C3P0 gadget execution. Any verinice.PRO account, including a non-admin account, can reach the flaw and execute commands with the server process's rights, exposing files and database data.

The record

CVE
CVE-2021-36981
Published
Aug 31, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 31, 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 privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.0NIST NVDAV:N/AC:L/Au:S/C:C/I:C/A:C
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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.

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 exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

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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