CVE-2020-27583Public exploitNetwork attack vector

Unauthenticated code execution via JReport RMI deserialization

Published Jan 21, 2021 · Updated Aug 4, 2024

Deserialization in IBM InfoSphere Information Server 8.5.0.0 allows remote attackers to execute arbitrary code through JReport RMI. The JReport service exposes a Java RMI registry whose Registry.bind() method deserializes a crafted parameter without validating its type, allowing a Commons Collections gadget payload to issue host commands. The service must be enabled and reachable on port 58611; successful commands run with the web service's privileges, observed as root in the published test.

CVSS severity9.8
Critical
EPSS probability3.69%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in IBM InfoSphere Information Server 8.5.0.0 allows remote attackers to execute arbitrary code through JReport RMI. The JReport service exposes a Java RMI registry whose Registry.bind() method deserializes a crafted parameter without validating its type, allowing a Commons Collections gadget payload to issue host commands. The service must be enabled and reachable on port 58611; successful commands run with the web service's privileges, observed as root in the published test.

The record

CVE
CVE-2020-27583
Published
Jan 21, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 21, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5NIST NVDAV:N/AC:L/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1210Exploitation of Remote Services

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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