CVE-2020-36239Network attack vector

Unauthenticated code execution via Ehcache RMI deserialization

Published Jul 29, 2021 · Updated Oct 17, 2024

Missing authentication in Atlassian Jira Data Center products allows remote attackers to execute code through the Ehcache RMI service. The service on port 40001 and potentially its object port accepts serialized calls without authenticating the connecting node. Any attacker able to reach those cluster ports can deserialize a crafted object in the Jira process and execute arbitrary code; older releases can allocate the object port randomly.

CVSS severity9.8
Critical
EPSS probability49.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Atlassian Jira Data Center products allows remote attackers to execute code through the Ehcache RMI service. The service on port 40001 and potentially its object port accepts serialized calls without authenticating the connecting node. Any attacker able to reach those cluster ports can deserialize a crafted object in the Jira process and execute arbitrary code; older releases can allocate the object port randomly.

The record

CVE
CVE-2020-36239
Published
Jul 29, 2021
Updated
Oct 17, 2024
Vendor
Atlassian
Product
Jira Software Data Center
Classifications
CWE-862, CWE-306, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 17, 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?

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

  1. Affected versionversion=6.3.0 <unspecified
  2. Affected versionversion=8.14.0 <unspecified
  3. Affected versionversion=8.6.0 <unspecified
  4. Affected versionversion=unspecified <8.13.8
  5. Affected versionversion=unspecified <8.17.0
  6. Affected versionversion=unspecified <8.5.16

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Atlassian · Jira Software Data Centerversion=6.3.0 <unspecified; version=8.14.0 <unspecified; version=8.6.0 <unspecified; version=unspecified <8.13.8; version=unspecified <8.17.0; version=unspecified <8.5.16
Atlassian · Jira Service Management Data Centerversion=2.0.2 <unspecified; version=4.14.0 <unspecified; version=4.6.0 <unspecified; version=unspecified <4.13.8; version=unspecified <4.17.0; version=unspecified <4.5.16
Atlassian · Jira Core Data Centerversion=6.3.0 <unspecified; version=8.14.0 <unspecified; version=8.6.0 <unspecified; version=unspecified <8.13.8; version=unspecified <8.17.0; version=unspecified <8.5.16
Atlassian · Jira Data Centerversion=6.3.0 <8.5.16; version=6.3.0 <unspecified; version=8.14.0 <8.17.0; version=8.14.0 <unspecified; version=8.6.0 <8.13.8; version=8.6.0 <unspecified; version=unspecified <8.13.8; version=unspecified <8.17.0; version=unspecified <8.5.16
Atlassian · Jira Service Managementversion=2.0.2 <4.5.16; version=4.14.0 <4.17.0; version=4.6.0 <4.13.8

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CWE-306Missing Authentication for Critical Function
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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