CVE-2019-20409Network attack vector

Remote code execution via unsafe Velocity introspection

Published Jun 23, 2020 · Updated Sep 17, 2024

Server-side template injection exposure in Atlassian Jira Server before 8.8.0 allows remote attackers to execute code through Velocity templates. Jira's Velocity setup lacked the Secure Introspector hardening, allowing a separately injectable template to resolve unsafe objects and methods during rendering. Exploitation requires another server-side template injection path; this hardening gap does not provide an independent entry point.

CVSS severity9.8
Critical
EPSS probability2.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side template injection exposure in Atlassian Jira Server before 8.8.0 allows remote attackers to execute code through Velocity templates. Jira's Velocity setup lacked the Secure Introspector hardening, allowing a separately injectable template to resolve unsafe objects and methods during rendering. Exploitation requires another server-side template injection path; this hardening gap does not provide an independent entry point.

The record

CVE
CVE-2019-20409
Published
Jun 23, 2020
Updated
Sep 17, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
CWE-74, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=unspecified <8.8.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Atlassian · Jira Serverversion=unspecified <8.8.0

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 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-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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