CVE-2020-4682Network attack vector

Remote code execution via unsafe client deserialization

Published Jan 28, 2021 · Updated Sep 16, 2024

Unsafe deserialization in IBM MQ Java and JMS client libraries 7.5 through 9.2 allows remote attackers to execute arbitrary code. The libraries unsafely deserialize trusted data; IBM has not published the entry point, accepted object types, or gadget path. Network access requires no authentication, but IBM rates exploitation as high complexity; successful exploitation executes code on the affected system.

CVSS severity8.1
High
EPSS probability7.79%
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 IBM MQ Java and JMS client libraries 7.5 through 9.2 allows remote attackers to execute arbitrary code. The libraries unsafely deserialize trusted data; IBM has not published the entry point, accepted object types, or gadget path. Network access requires no authentication, but IBM rates exploitation as high complexity; successful exploitation executes code on the affected system.

The record

CVE
CVE-2020-4682
Published
Jan 28, 2021
Updated
Sep 16, 2024
Vendor
IBM
Product
IBM MQ
Classifications
CWE-502
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 28, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.5.0
  2. Affected versionversion=8.0.0
  3. Affected versionversion=9.0.0
  4. Affected versionversion=9.1.0
  5. Affected versionversion=9.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

IBM · IBM MQversion=7.5.0; version=8.0.0; version=9.0.0; version=9.1.0; version=9.2.0

Published CVSS scores

8.1IBM CorporationCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0NIST NVDAV:N/AC:L/Au:N/C:C/I:C/A:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data

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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