CVE-2020-12835Public exploitNetwork attack vector

Code execution via malicious RMI license responses

Published May 20, 2020 · Updated Aug 4, 2024

Unsafe deserialization in SmartBear ReadyAPI SoapUI Pro 3.2.5 allows attackers to execute code via a malicious RMI license server. During floating-license checkout, the client deserializes JRMP return objects from an unauthenticated server, allowing classpath gadget chains to run. Exploitation requires a configured network floating license and a network position from which the legitimate server can be impersonated; successful code runs in the ReadyAPI client process.

CVSS severity9.8
Critical
EPSS probability12.97%
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 SmartBear ReadyAPI SoapUI Pro 3.2.5 allows attackers to execute code via a malicious RMI license server. During floating-license checkout, the client deserializes JRMP return objects from an unauthenticated server, allowing classpath gadget chains to run. Exploitation requires a configured network floating license and a network position from which the legitimate server can be impersonated; successful code runs in the ReadyAPI client process.

The record

CVE
CVE-2020-12835
Published
May 20, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2020CVE 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 NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/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.

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-502Deserialization of Untrusted Data
T1203Exploitation for Client Execution

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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