CVE-2019-20413Network attack vector

Unauthenticated service interruption via unvalidated picker input

Published Jun 29, 2020 · Updated Sep 16, 2024

DoS in UserPickerBrowser.jspa in Atlassian Jira Server before 7.13.9 and 8.0.0 through 8.4.1 allows remote attackers to interrupt service. The page accepts request input without required validation, but Atlassian has not disclosed the parameter, processing path, or resource-exhaustion behavior. No authentication or user interaction is required; successful exploitation affects availability only, with no reported ability to read or alter data.

CVSS severity7.5
High
EPSS probability2.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DoS in UserPickerBrowser.jspa in Atlassian Jira Server before 7.13.9 and 8.0.0 through 8.4.1 allows remote attackers to interrupt service. The page accepts request input without required validation, but Atlassian has not disclosed the parameter, processing path, or resource-exhaustion behavior. No authentication or user interaction is required; successful exploitation affects availability only, with no reported ability to read or alter data.

The record

CVE
CVE-2019-20413
Published
Jun 29, 2020
Updated
Sep 16, 2024
Vendor
Atlassian
Product
Jira Server
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2020CVE 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=8.0.0 <unspecified
  2. Affected versionversion=unspecified <7.13.9
  3. Affected versionversion=unspecified <8.4.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Atlassian · Jira Serverversion=8.0.0 <unspecified; version=unspecified <7.13.9; version=unspecified <8.4.2

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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